style(题目页): 相似题目推荐的颜色太浅太淡，题目名绿得发虚、第二行灰得看不清

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -0,0 +1,152 @@
+# push 到 origin（git.xuyue.cc）的 main 就部署：在开发机上编好产物 → rsync 到服务器 →
+# 服务器上跑 docker/deploy.sh --prebuilt 起栈。
+#
+# 跑在哪：开发机上的 gitea-runner（host 模式，标签 oj2-deploy），不在服务器上。
+#   - 服务器只有 2 核，编一次要 5 分钟左右、光前端就 160 秒，编的时候判题会排队。
+#   - 原来在 GitHub 上编，海外 → 服务器晚高峰只有十几 KB/s，rsync 一次要五六分钟；
+#     开发机 → 服务器实测 5MB 约 1 秒。
+#   代价：**push 时开发机得开着。** 没开的话任务在 Gitea 里排队，开机后 runner 连上就接着跑。
+#   runner 的装法和配置见 docs/deploy.md「部署 runner」。
+#
+# host 模式直接用开发机自己的东西：PATH 里的 bun、~/.ssh/config 里的 `debian`（root@服务器）
+# 和 git.xuyue.cc 的 SSH 访问。所以这里**不需要配任何 secret**，也不用 actions/checkout
+# （它要去 GitHub 拉 action，在国内反而是最慢的一步）。
+#
+# 有了 .gitea/workflows 之后，Gitea 不再读 .github/workflows；GitHub 那份改成了只能手动
+# 触发的备用路线（开发机不在时用），push 不会在两边各部署一次。
+name: Deploy
+
+on:
+  push:
+    branches:
+      - main
+  # 手动触发时可以放行破坏性迁移。push 触发拿不到这个 input，值恒为空 ——
+  # 也就是说**自动部署永远不会执行 DROP TABLE 之类的迁移**，只会停在闸门上把
+  # 工作流判红。这是有意的：那种改动得有人先确认备份。
+  workflow_dispatch:
+    inputs:
+      allow_destructive:
+        description: "放行破坏性迁移（DROP TABLE / DROP COLUMN / ALTER TYPE …）。勾之前先确认已备份数据库。"
+        type: boolean
+        default: false
+
+# 两次 push 挨得近时，别让两个 deploy.sh 在服务器上同时起栈。
+# runner 的 capacity 也是 1，这里再保一道。
+concurrency:
+  group: deploy
+  cancel-in-progress: false
+
+env:
+  REMOTE: debian # 开发机 ~/.ssh/config 里的主机名
+  REMOTE_DIR: /root/OJDeploy/OJ2
+
+jobs:
+  deploy:
+    runs-on: oj2-deploy
+    timeout-minutes: 20
+    steps:
+      # 工作目录可能是上一次留下的，所以 fetch 之后强制切过去再清掉没跟踪的文件
+      # （node_modules 留着，bun install 会对齐它）。
+      - name: 取代码
+        env:
+          SHA: ${{ gitea.sha }}
+          REPO: ${{ gitea.repository }}
+        run: |
+          git init -q .
+          git fetch -q --depth 1 "git@git.xuyue.cc:$REPO.git" "$SHA"
+          git checkout -q --force FETCH_HEAD
+          git clean -ffdxq -e node_modules
+          git log --oneline -1
+
+      # 单二进制把运行时一起打进去：这里用的 bun 是哪个，线上跑的就是哪个。
+      #
+      # ⚠️ **不能用开发机 PATH 里的 bun。** pacman 装的 bun 是 Arch 自己编的，动态链接系统的
+      # ICU（libicui18n.so.78），编出来的 oj2-api 到容器里就报找不到这个库 —— 2026-11-03
+      # 第一次跑就撞上了，好在迁移那步先炸、容器没动。官方发布的 bun 自带 ICU，
+      # 只依赖 libc，和 GitHub 上 setup-bun 装的是同一个东西。
+      #
+      # 所以这里按 packageManager 的版本下载官方二进制（核 sha256），缓存在
+      # ~/.cache/oj2-deploy/ 下，同一个版本只下一次；再把它放到 PATH 最前面，
+      # 后面的 bun install / bunx 都走它。
+      - name: 装 bun
+        run: |
+          ver=$(sed -nE 's/.*"packageManager": *"bun@([^"]+)".*/\1/p' package.json)
+          [ -n "$ver" ] || { echo "::error::package.json 里读不到 packageManager 的 bun 版本"; exit 1; }
+          dir="$HOME/.cache/oj2-deploy/bun-v$ver"
+          if [ ! -x "$dir/bun" ]; then
+            tmp=$(mktemp -d)
+            base="https://github.com/oven-sh/bun/releases/download/bun-v$ver"
+            curl -fsSL --retry 3 -o "$tmp/bun-linux-x64.zip" "$base/bun-linux-x64.zip"
+            curl -fsSL --retry 3 -o "$tmp/SHASUMS256.txt" "$base/SHASUMS256.txt"
+            (cd "$tmp" && grep ' bun-linux-x64.zip$' SHASUMS256.txt | sha256sum -c -)
+            unzip -q "$tmp/bun-linux-x64.zip" -d "$tmp"
+            mkdir -p "$dir"
+            install -m755 "$tmp/bun-linux-x64/bun" "$dir/bun"
+            rm -rf "$tmp"
+          fi
+          [ "$("$dir/bun" --version)" = "$ver" ] || { echo "::error::$dir/bun 的版本不是 $ver"; exit 1; }
+          echo "$dir" >> "$GITHUB_PATH"
+          echo "用 $dir/bun（$ver）"
+
+      - name: 装依赖
+        run: bun install --frozen-lockfile
+
+      # 输出到 dist/oj2-api，正是 Dockerfile 里 artifacts-prebuilt 阶段要的位置。
+      # 编完先看它链接了什么：官方 bun 编出来的只依赖 libc 那几个，多出任何一个库
+      # （比如 libicu）都说明用错了 bun，到容器里一定起不来。在这里拦下，
+      # 别等服务器上构建完镜像、迁移时才炸 —— 那时 oj2-api:latest 已经被换成坏镜像了。
+      - name: 编后端
+        run: |
+          bun run --filter '@oj2/api' build
+          ldd dist/oj2-api
+          extra=$(ldd dist/oj2-api | awk '{print $1}' | grep -vE '^(linux-vdso\.so\.1|libc\.so\.6|libpthread\.so\.0|libdl\.so\.2|libm\.so\.6|/lib64/ld-linux-x86-64\.so\.2)$' || true)
+          [ -z "$extra" ] || { echo "::error::dist/oj2-api 多链接了这些库，容器里没有：$extra"; exit 1; }
+
+      # 默认 production 模式，读 apps/web/.env.production（在版本库里）。
+      - name: 编前端
+        run: cd apps/web && bun run build
+
+      # 格式、lint、前后端类型检查、路由遮蔽、AST 节点，有一项不过就不部署。
+      # 必须排在「编前端」之后：前端类型检查要 unplugin 生成的 auto-imports.d.ts /
+      # components.d.ts，它们不进版本库，vite build 时才生成。
+      - name: 检查
+        run: bunx vp run verify
+
+      # 排除项和 --no-owner --no-group 的理由见 .github/workflows/deploy.yml 同名一步，
+      # 一条都不能少（少了 data 就是删库，少了 docker/.env* 下一步自检直接 die）。
+      #   -c               按内容比：每次 checkout 出来的 mtime 都是「刚才」，按 mtime 比会把
+      #                    600 多个没改的文件逐个走一遍增量。
+      #   --delay-updates  全部传完才一起换上去，中途断了服务器上不会留下半新半旧的源码。
+      #   --timeout        60 秒没有数据进出就算断了，交给循环重试，半截文件接着用。
+      - name: 同步到服务器
+        timeout-minutes: 10
+        run: |
+          for attempt in 1 2 3; do
+            rsync -a -c --no-owner --no-group --delete-delay --delay-updates \
+              --compress --compress-choice=zstd \
+              --timeout=60 --stats --human-readable \
+              -e "ssh -o BatchMode=yes -o ServerAliveInterval=15 -o ServerAliveCountMax=4" \
+              --exclude node_modules \
+              --exclude .git \
+              --exclude data \
+              --exclude 'docker/.env*' \
+              ./ "$REMOTE:$REMOTE_DIR/" && exit 0
+            echo "::warning::rsync 第 $attempt 次没传完，10 秒后重试"
+            sleep 10
+          done
+          exit 1
+
+      # deploy.sh 自检不过 / 迁移被拦 / 容器没起来 / 冒烟发现题目数是 0，都会非零退出。
+      # 破坏性迁移会被拦下并退出 4，除非手动触发时勾了 allow_destructive。
+      #
+      # 放行与否在 shell 里按字符串 "true" 判：Gitea 的 inputs 是布尔还是字符串，
+      # "false" 这个非空字符串都不会被当成放行（GitHub 那份踩过 github.event.inputs 的坑）。
+      - name: 起栈
+        env:
+          ALLOW_INPUT: ${{ inputs.allow_destructive }}
+        run: |
+          allow=''
+          [ "$ALLOW_INPUT" = "true" ] && allow=1
+          echo "放行破坏性迁移：${allow:-否}"
+          ssh -o BatchMode=yes -o ServerAliveInterval=15 -o ServerAliveCountMax=8 "$REMOTE" \
+            "cd $REMOTE_DIR && OJ2_ALLOW_DESTRUCTIVE='$allow' docker/deploy.sh --prebuilt"

.github/workflows/deploy.yml

@@ -1,19 +1,20 @@
-# 在 runner 上编好产物 → rsync 到服务器 → 服务器上跑 docker/deploy.sh 起栈。
+# 备用部署路线：**只能手动触发**（Actions 页面 → Deploy → Run workflow）。
+# 平时的部署是 push origin 时由开发机上的 gitea-runner 跑 .gitea/workflows/deploy.yml，
+# 这份只在开发机不在、又急着上线时用。
 #
-# 为什么产物在这里编：服务器性能差，镜像 builder 阶段（1238 个包的 bun install +
+# 为什么不再 push 就跑：GitHub 的 runner 在海外，到服务器晚高峰只有十几 KB/s，
-# bun compile + vite build）首次约 5 分钟，光前端就 160s。runner 编完传过去，
+# rsync 一次要五六分钟（后端改一行，--bytecode 那段约 6MB 字节码就整段重写，增量省不掉）。
-# 服务器那边的镜像构建只剩几条 COPY。
+# 而 origin 会镜像到 github，两边都 push 触发的话每次会部署两遍，两边的并发锁又不通。
+#
+# 流程：在 runner 上编好产物 → rsync 到服务器 → 服务器上跑 docker/deploy.sh 起栈。
+# 产物不在服务器上编，是因为服务器性能差，镜像 builder 阶段（1238 个包的 bun install +
+# bun compile + vite build）首次约 5 分钟，光前端就 160s。
 #
 # 服务器自己编的能力**没有砍掉**：docker/deploy.sh 不带 --prebuilt 就是原来的
-# 行为（ARTIFACTS=build），只要机器上有 docker 就能手动部署，不依赖这个工作流。
+# 行为（ARTIFACTS=build），只要机器上有 docker 就能手动部署，不依赖任何工作流。
 #
-# 触发的是 push 到 **github** 这个 remote：
+# job 上卡了 server_url：只在 GitHub 上跑。仓库有了 .gitea/workflows 之后 Gitea 本来就
-#
+# 不再读这份，这道闸留着防万一。
-#   git push github main
-#
-# origin（git.xuyue.cc）是 Gitea，仓库里没有 .gitea/workflows 时它的 Actions 会退回来
-# 读这份 .github/workflows，每次 push origin 都会把部署再跑一遍 —— 那边不需要。
-# 所以下面 job 上卡了 server_url：只在 GitHub 上跑，Gitea 上直接跳过。
 #
 # 仓库 Settings → Secrets 需要两个：
 #   HOST  服务器地址
@@ -21,12 +22,8 @@
 name: Deploy
 
 on:
-  push:
+  # 手动触发时可以放行破坏性迁移；不勾就停在闸门上把工作流判红。
-    branches:
+  # 那种改动得有人先确认备份。
-      - main
-  # 手动触发时可以放行破坏性迁移。push 触发拿不到这个 input，值恒为空 ——
-  # 也就是说**自动部署永远不会执行 DROP TABLE 之类的迁移**，只会停在闸门上把
-  # 工作流判红。这是有意的：那种改动得有人先确认备份。
   workflow_dispatch:
     inputs:
       allow_destructive:
@@ -97,9 +94,21 @@ jobs:
           chmod 600 ~/.ssh/id_deploy
           ssh-keyscan -p "$REMOTE_PORT" -H "${{ secrets.HOST }}" >> ~/.ssh/known_hosts 2>/dev/null
 
-      # 源码和产物一起传。dist/oj2-api 有 77MB，但 rsync 对已存在的文件做增量，
+      # 源码和产物一起传。dist/oj2-api 有 115MB，但 rsync 对已存在的文件做增量，
       # 重编后大部分（bun 运行时那段）字节不变，实际传输量远小于这个数。
       #
+      # 慢在线路上：runner 在海外，到服务器晚高峰只有十几 KB/s，传 3~4MB 就要五六分钟。
+      # 后端只要改了一行，--bytecode 那段字节码（约 6MB）就整段重写、增量也省不掉，
+      # 它占了每次传输量的七成多。下面几个开关都是为了少传、传不动时别干等：
+      #   -c            按内容比，不看 mtime。checkout 出来每个文件的 mtime 都是「刚才」，
+      #                 不加它 rsync 会把 600 多个没改的源码逐个走一遍增量、来回交换校验块。
+      #   zstd 19       比默认的 zlib 再少传约 17%（实测 4.09MB → 3.38MB），压缩只花 runner 的 CPU。
+      #   --delay-updates  全部传完才一次性换上去，中途断了服务器上不会留下半新半旧的源码。
+      #   --timeout     60 秒没有任何数据进出就算断了，交给外面的循环重试；
+      #                 重试时 --delay-updates 留在 .~tmp~ 里的半截文件会接着用，不从头传。
+      #   ServerAlive   连接悄悄死掉时 ssh 自己能发现，不会一直挂着。
+      #   --stats       日志里能看到这次到底传了多少字节。
+      #
       # --delete 的排除项少一个就会出事，逐条说明：
       #   docker/.env  服务器上唯一一份，不在版本库里（.gitignore 排掉了 .env*）。
       #                删了下一步 deploy.sh 自检就直接 die。
@@ -114,14 +123,22 @@ jobs:
       # 还是当初手动 clone 时的 root。两者对不上，之后在服务器上跑任何 git 命令都会被
       # 「检测到可疑的仓库所有权」挡下（git 2.35.2 起的 safe.directory 检查）。
       - name: 同步到服务器
+        timeout-minutes: 20
         run: |
-          rsync -az --no-owner --no-group --delete \
+          for attempt in 1 2 3; do
-            -e "ssh -i ~/.ssh/id_deploy -p $REMOTE_PORT" \
+            rsync -a -c --no-owner --no-group --delete-delay --delay-updates \
-            --exclude node_modules \
+              --compress --compress-choice=zstd --compress-level=19 \
-            --exclude .git \
+              --timeout=60 --stats --human-readable \
-            --exclude data \
+              -e "ssh -i ~/.ssh/id_deploy -p $REMOTE_PORT -o ServerAliveInterval=15 -o ServerAliveCountMax=4" \
-            --exclude 'docker/.env*' \
+              --exclude node_modules \
-            ./ "root@${{ secrets.HOST }}:$REMOTE_DIR/"
+              --exclude .git \
+              --exclude data \
+              --exclude 'docker/.env*' \
+              ./ "root@${{ secrets.HOST }}:$REMOTE_DIR/" && exit 0
+            echo "::warning::rsync 第 $attempt 次没传完，10 秒后重试"
+            sleep 10
+          done
+          exit 1
 
       # deploy.sh 自检不过 / 迁移被拦 / 容器没起来 / 冒烟发现题目数是 0，都会非零退出，
       # 这一步跟着红，日志里能看到具体是哪一条。

CLAUDE.md

@@ -62,7 +62,8 @@ cd apps/web && bun run build                  # 前端构建（不在 verify 里
 配置都只在根目录的 `vite.config.ts` 一份：`fmt` 块（Oxfmt 的写法，`bun fmt` 直接读它；
 `semi: false`、`singleQuote: true`、`printWidth: 160`）、`lint` 块（Oxlint，`denyWarnings`）、`run.tasks`
 （`verify` 和它依赖的四个检查）。**别用 `vp fmt` / `vp check`**：Oxfmt 和 `bun fmt` 只在
-长 CSS 值列表的折行上不一样，混着跑会把 `apps/web/public/style.css` 来回改。前端自己的构建
+长 CSS 值列表的折行上不一样，混着跑会把 `apps/web/public/style.css`、`apps/web/src/oj/learn/learn.css` 来回改
+（`vp fmt --list-different` 能列出当前受影响的文件）。前端自己的构建
 配置在 `apps/web/vite.config.ts`，和根目录那份无关。
 
 - 格式化只管代码：`.md` / `.yml` / `.json` / `.toml` 在 `fmt.ignorePatterns` 里排掉了
@@ -85,9 +86,9 @@ references 的壳，真正的配置在 `tsconfig.app.json`），而 `vite build`
 
 ## 提交
 
-**直接在 `main` 上干活，不开特性分支。** 注意 push 到 `github` 这个 remote 的 `main`
+**直接在 `main` 上干活，不开特性分支。** 注意 **push `origin` 的 `main` 就会部署**：
-会触发 CI 部署；而 `origin` 会镜像到 `github`，**平时 push `origin` 通常几秒后也就部署了**
+开发机上的 gitea-runner 跑 `.gitea/workflows/deploy.yml`，进度在 git.xuyue.cc 的 Actions 页面。
-（偶尔不跟，要 `git ls-remote github` 核实）。见 `docs/deploy.md`。
+GitHub 那份只剩手动触发的备用路线。见 `docs/deploy.md`。
 
 提交信息用中文，格式 `type(范围): 从用户视角描述现象`，例如
 `fix(流程图): 「重新判题」从来没成功过，而且会把原来的评分清掉`。

apps/api/src/db/0043_mascot_event.sql

@@ -0,0 +1,14 @@
+CREATE TABLE "mascot_event" (
+	"id" integer PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY (sequence name "mascot_event_id_seq" INCREMENT BY 1 MINVALUE 1 MAXVALUE 2147483647 START WITH 1 CACHE 1),
+	"user_id" integer NOT NULL,
+	"kind" text NOT NULL,
+	"situation" text,
+	"line" text,
+	"action" text,
+	"path" text NOT NULL,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "mascot_event" ADD CONSTRAINT "mascot_event_user_id_fk_user_id" FOREIGN KEY ("user_id") REFERENCES "public"."user"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+CREATE INDEX "mascot_event_user_kind_idx" ON "mascot_event" USING btree ("user_id","kind");--> statement-breakpoint
+CREATE INDEX "mascot_event_created_at_idx" ON "mascot_event" USING btree ("created_at");

apps/api/src/db/0044_achievement_more_tiers.sql

@@ -0,0 +1,184 @@
+-- 成就惠及更多学生（2026-11-03）。已经拿到的一个不收回。
+--
+-- 这学期 375 个交过题的学生，成就数中位数 5 个、三分之一只有 0–2 个。三件事：
+--
+-- 1. 比赛里的提交也算成就（判题结算同步改了，见 services/achievements.ts 的 solvedCounts）。
+--    这里的比赛其实是单班测验，2612 班整个班都在比赛里做题，人均做对 17 道却一个成就也没有；
+--    「参加过几场比赛」以前判题时也不更新，只在后台重扫时刷新，所以连「初入赛场」都没拿到。
+-- 2. 几条线补上低一档（10 道和 50 道之间、一次就对 1 次和 20 次之间……），外加一条新线
+--    「挑战成功」。括号里是这学期学生已经达到的比例。
+-- 3. 档多了，「奖杯收藏家」从 15 个提到 20 个，不然人人都有。
+--
+-- 然后从提交记录把含比赛的指标重数一遍，按新配置给所有达标的人补发（backfilled，不显示日期）。
+-- 编译错误次数和按天的连续不重数：前者上线前的历史本来就没有，后者已经下架。
+
+INSERT INTO "achievement" ("name", "description", "icon", "rarity", "hidden", "metric", "operator", "threshold", "visible", "unlock_count", "order", "create_time") VALUES
+  ('稳扎稳打', '通过 20 道题目', 'noto:orange-book', 'bronze', false, 'accepted_count', 'gte', 20, true, 0, 2, now()),          -- 44%
+  ('初露锋芒', '通过 1 道中等难度题目', 'noto:sunrise-over-mountains', 'bronze', false, 'mid_ac_count', 'gte', 1, true, 0, 6, now()), -- 21%
+  ('迎难而上', '挑战成功 1 次', 'noto:puzzle-piece', 'bronze', false, 'challenge_count', 'gte', 1, true, 0, 10, now()),      -- 60%
+  ('精益求精', '挑战成功 5 次', 'noto:gem-stone', 'silver', false, 'challenge_count', 'gte', 5, true, 0, 10, now()),         -- 12%
+  ('勤学苦练', '累计提交 30 次', 'noto:pencil', 'bronze', false, 'submission_count', 'gte', 30, true, 0, 11, now()),         -- 48%
+  ('渐成习惯', '累计 5 天有提交记录', 'noto:spiral-calendar', 'bronze', false, 'active_days', 'gte', 5, true, 0, 15, now()), -- 59%
+  ('手感火热', '累计 5 次首次提交即通过', 'noto:glowing-star', 'bronze', true, 'first_try_ac_count', 'gte', 5, true, 0, 25, now()), -- 67%
+  ('再试一次', '同一道题失败 3 次后终于通过', 'noto:counterclockwise-arrows-button', 'bronze', true, 'max_wa_before_ac', 'gte', 3, true, 0, 32, now()), -- 54%
+  ('一鼓作气', '一天之内通过 5 道题', 'noto:dashing-away', 'bronze', true, 'max_ac_in_one_day', 'gte', 5, true, 0, 34, now()); -- 57%
+--> statement-breakpoint
+UPDATE "achievement" SET "threshold" = 20, "description" = '解锁 20 个成就（不含白金）'
+WHERE "metric" = 'achievement_unlocked_count' AND "threshold" = 15;
+--> statement-breakpoint
+-- 交过题、还没有 user_stat 的人先建一行（2612 班大多是这样：比赛提交以前根本不进结算）
+INSERT INTO "user_stat" ("user_id", "metrics", "update_time")
+SELECT DISTINCT s."user_id", '{}'::jsonb, now()
+FROM "submission" s
+JOIN "user" u ON u."id" = s."user_id"
+ON CONFLICT ("user_id") DO NOTHING;
+--> statement-breakpoint
+-- 按判题结算的口径从提交记录重数（services/achievements.ts）：含比赛；在判的（6/7）不算，
+-- 它们判完时结算会自己加；做对 = ACCEPTED(0) / AST_CHECK_FAILED(10)；日历按东八区。
+-- 「新做对」= 这道题第一次做对的那条提交。
+UPDATE "user_stat" AS target
+SET "metrics" = target."metrics" || fresh.metrics, "update_time" = now()
+FROM (
+  WITH subs AS (
+    SELECT s."id", s."user_id", s."problem_id", s."contest_id", s."result", s."language", s."code", s."create_time",
+      (s."create_time" AT TIME ZONE 'Asia/Shanghai') AS local, p."difficulty",
+      s."result" IN (0, 10) AS ac,
+      -- 这道题在这条之前交过几次（同一时刻的不算「之前」，和结算里的 create_time < 一致）
+      rank() OVER (PARTITION BY s."user_id", s."problem_id" ORDER BY s."create_time") - 1 AS before
+    FROM "submission" s
+    JOIN "user" u ON u."id" = s."user_id"
+    JOIN "problem" p ON p."id" = s."problem_id"
+    WHERE s."result" NOT IN (6, 7)
+  ),
+  totals AS (
+    SELECT "user_id",
+      count(DISTINCT "problem_id") FILTER (WHERE ac)::int AS accepted,
+      count(DISTINCT "problem_id") FILTER (WHERE ac AND "difficulty" = 'Mid')::int AS mid,
+      count(DISTINCT "problem_id") FILTER (WHERE ac AND "difficulty" = 'High')::int AS hard,
+      count(*)::int AS submissions,
+      count(DISTINCT "contest_id")::int AS contests,
+      count(*) FILTER (WHERE extract(hour FROM local) < 5)::int AS midnight,
+      count(*) FILTER (WHERE extract(hour FROM local) >= 5 AND extract(hour FROM local) < 7)::int AS early,
+      jsonb_agg(DISTINCT "language") AS languages,
+      jsonb_agg(DISTINCT to_char(local, 'YYYY-MM-DD')) AS dates
+    FROM subs GROUP BY "user_id"
+  ),
+  first_try AS (
+    SELECT "user_id", count(*) FILTER (WHERE ac)::int AS n
+    FROM (SELECT DISTINCT ON ("user_id", "problem_id") "user_id", ac FROM subs ORDER BY "user_id", "problem_id", "create_time", "id") f
+    GROUP BY "user_id"
+  ),
+  code_lines AS (
+    SELECT "user_id", max((
+      SELECT count(*) FROM regexp_split_to_table("code", E'\n') AS line WHERE btrim(line, E' \t\r') <> ''
+    ))::int AS n
+    FROM subs WHERE ac GROUP BY "user_id"
+  ),
+  first_ac AS (
+    SELECT DISTINCT ON ("user_id", "problem_id") "user_id", "problem_id", local, before
+    FROM subs WHERE ac ORDER BY "user_id", "problem_id", "create_time", "id"
+  ),
+  wa_before AS (
+    SELECT "user_id", max(before)::int AS n FROM first_ac GROUP BY "user_id"
+  ),
+  per_day AS (
+    SELECT "user_id", jsonb_object_agg(day, n) AS days, max(n)::int AS best
+    FROM (SELECT "user_id", to_char(local, 'YYYY-MM-DD') AS day, count(*)::int AS n FROM first_ac GROUP BY 1, 2) d
+    GROUP BY "user_id"
+  ),
+  weeks AS (
+    SELECT DISTINCT "user_id", date_trunc('week', local)::date AS w FROM first_ac
+  ),
+  runs AS (
+    SELECT "user_id", count(*)::int AS len, max(w) AS last_w
+    FROM (SELECT "user_id", w, w - (row_number() OVER (PARTITION BY "user_id" ORDER BY w))::int * 7 AS g FROM weeks) i
+    GROUP BY "user_id", g
+  ),
+  streak AS (
+    SELECT "user_id", max(len) AS best, (array_agg(len ORDER BY last_w DESC))[1] AS current, max(last_w) AS last_w
+    FROM runs GROUP BY "user_id"
+  ),
+  challenges AS (
+    SELECT "user_id", count(*)::int AS n FROM "challenge_success" GROUP BY "user_id"
+  )
+  SELECT t."user_id",
+    jsonb_build_object(
+      'accepted_count', t.accepted,
+      'mid_ac_count', t.mid,
+      'hard_ac_count', t.hard,
+      'first_try_ac_count', coalesce(ft.n, 0),
+      'submission_count', t.submissions,
+      'contest_joined', t.contests,
+      'midnight_submissions', t.midnight,
+      'early_bird_submissions', t.early,
+      '_languages', t.languages,
+      'languages_used', jsonb_array_length(t.languages),
+      '_active_dates', t.dates,
+      'active_days', jsonb_array_length(t.dates),
+      'max_code_lines', coalesce(cl.n, 0),
+      'max_wa_before_ac', coalesce(wb.n, 0),
+      '_ac_per_day', coalesce(pd.days, '{}'::jsonb),
+      'max_ac_in_one_day', coalesce(pd.best, 0),
+      'challenge_count', coalesce(ch.n, 0)
+    ) || CASE WHEN st."user_id" IS NULL THEN '{}'::jsonb ELSE jsonb_build_object(
+      'max_ac_week_streak', st.best,
+      '_current_ac_week_streak', st.current,
+      '_last_ac_week', to_char(st.last_w, 'YYYY-MM-DD')
+    ) END AS metrics
+  FROM totals t
+  LEFT JOIN first_try ft ON ft."user_id" = t."user_id"
+  LEFT JOIN code_lines cl ON cl."user_id" = t."user_id"
+  LEFT JOIN wa_before wb ON wb."user_id" = t."user_id"
+  LEFT JOIN per_day pd ON pd."user_id" = t."user_id"
+  LEFT JOIN streak st ON st."user_id" = t."user_id"
+  LEFT JOIN challenges ch ON ch."user_id" = t."user_id"
+) fresh
+WHERE target."user_id" = fresh."user_id";
+--> statement-breakpoint
+-- 挑战成功了、却一条提交都没有的（不会有，保险）也给个数
+UPDATE "user_stat" AS target
+SET "metrics" = jsonb_set(target."metrics", '{challenge_count}', to_jsonb(c.n))
+FROM (SELECT "user_id", count(*)::int AS n FROM "challenge_success" GROUP BY "user_id") c
+WHERE target."user_id" = c."user_id" AND (target."metrics" -> 'challenge_count') IS DISTINCT FROM to_jsonb(c.n);
+--> statement-breakpoint
+-- 补发：上架的、非元成就，达标没发的都发（口径同 rescanAchievement：backfilled、待通知）
+INSERT INTO "user_achievement" ("user_id", "achievement_id", "unlock_time", "backfilled", "notified")
+SELECT st."user_id", a."id", now(), true, false
+FROM "user_stat" st
+JOIN "achievement" a ON a."visible" AND a."metric" <> 'achievement_unlocked_count'
+WHERE jsonb_typeof(st."metrics" -> a."metric") = 'number'
+  AND CASE WHEN a."operator" = 'gte' THEN (st."metrics" ->> a."metric")::numeric >= a."threshold"
+           ELSE (st."metrics" ->> a."metric")::numeric <= a."threshold" END
+ON CONFLICT ("user_id", "achievement_id") DO NOTHING;
+--> statement-breakpoint
+-- 已解锁数（上架的非白金）重数，口径同 refreshUnlockedCount
+UPDATE "user_stat" AS target
+SET "metrics" = jsonb_set(target."metrics", '{achievement_unlocked_count}', to_jsonb(fresh.value))
+FROM (
+  SELECT s."id", coalesce(c.value, 0) AS value
+  FROM "user_stat" s
+  LEFT JOIN (
+    SELECT ua."user_id", count(*)::int AS value
+    FROM "user_achievement" ua
+    JOIN "achievement" a ON a."id" = ua."achievement_id"
+    WHERE a."rarity" <> 'platinum' AND a."visible"
+    GROUP BY ua."user_id"
+  ) c ON c."user_id" = s."user_id"
+) fresh
+WHERE target."id" = fresh."id"
+  AND (target."metrics" -> 'achievement_unlocked_count') IS DISTINCT FROM to_jsonb(fresh.value);
+--> statement-breakpoint
+-- 第二轮：元成就（奖杯收藏家）
+INSERT INTO "user_achievement" ("user_id", "achievement_id", "unlock_time", "backfilled", "notified")
+SELECT st."user_id", a."id", now(), true, false
+FROM "user_stat" st
+JOIN "achievement" a ON a."visible" AND a."metric" = 'achievement_unlocked_count'
+WHERE jsonb_typeof(st."metrics" -> a."metric") = 'number'
+  AND CASE WHEN a."operator" = 'gte' THEN (st."metrics" ->> a."metric")::numeric >= a."threshold"
+           ELSE (st."metrics" ->> a."metric")::numeric <= a."threshold" END
+ON CONFLICT ("user_id", "achievement_id") DO NOTHING;
+--> statement-breakpoint
+UPDATE "achievement" AS a
+SET "unlock_count" = coalesce(c.n, 0)
+FROM (SELECT "achievement_id", count(*)::int AS n FROM "user_achievement" GROUP BY "achievement_id") c
+WHERE c."achievement_id" = a."id" AND a."unlock_count" IS DISTINCT FROM c.n;

apps/api/src/db/meta/_journal.json

@@ -302,6 +302,20 @@
       "when": 1793632543220,
       "tag": "0042_class_name_cleanup",
       "breakpoints": true
+    },
+    {
+      "idx": 43,
+      "version": "7",
+      "when": 1793693911394,
+      "tag": "0043_mascot_event",
+      "breakpoints": true
+    },
+    {
+      "idx": 44,
+      "version": "7",
+      "when": 1793695621303,
+      "tag": "0044_achievement_more_tiers",
+      "breakpoints": true
     }
   ]
 }

apps/api/src/db/schema.ts

@@ -46,6 +46,7 @@ import type {
   JudgeStatus,
   LessonLanguage,
   LessonMode,
+  MascotEventKind,
   ProblemChallenges,
   ProblemDifficulty,
   ProblemLanguage,
@@ -1411,3 +1412,45 @@ export const challengeSuccess = pgTable(
     }).onDelete('cascade'),
   ],
 )
+
+/**
+ * 看板娘的互动记录：点开气泡、点气泡里的按钮、她主动开口、摸头彩蛋、被拖走（种类见契约
+ * mascotEventSchema）。拿来看她说的话、给的按钮学生用不用，以后按学生的行为调整她也读这里；
+ * 「点过几次」（熟悉程度）直接按 user_id 数 open。
+ *
+ * 不是「学生做过什么」的证据，账号没了就没意义，user 外键 CASCADE（外键分档见 CLAUDE.md「数据库」）。
+ */
+export const mascotEvent = pgTable(
+  'mascot_event',
+  {
+    id: integer().primaryKey().generatedByDefaultAsIdentity({
+      name: 'mascot_event_id_seq',
+      startWith: 1,
+      increment: 1,
+      minValue: 1,
+      maxValue: 2147483647,
+      cache: 1,
+    }),
+    userId: integer('user_id').notNull(),
+    kind: text().$type<MascotEventKind>().notNull(),
+    situation: text(),
+    line: text(),
+    action: text(),
+    path: text().notNull(),
+    createdAt: timestamp('created_at', {
+      withTimezone: true,
+      mode: 'string',
+    })
+      .notNull()
+      .defaultNow(),
+  },
+  (table) => [
+    index('mascot_event_user_kind_idx').on(table.userId, table.kind),
+    index('mascot_event_created_at_idx').on(table.createdAt),
+    foreignKey({
+      columns: [table.userId],
+      foreignColumns: [user.id],
+      name: 'mascot_event_user_id_fk_user_id',
+    }).onDelete('cascade'),
+  ],
+)

apps/api/src/index.ts

@@ -21,6 +21,7 @@ import { problemRoutes } from './routes/problem'
 import { problemStatsRoutes } from './routes/problem-stats'
 import { submissionRoutes } from './routes/submission'
 import { trialRunRoutes } from './routes/trial-run'
+import { mascotRoutes } from './routes/mascot'
 import { siteRoutes } from './routes/site'
 import { scanPendingChallenges } from './services/challenge'
 import { bridgeSubmissionEvents, isAllowedWebSocketOrigin, startSessionSweep, submissionWebSocketHandler, type SubmissionSocketData } from './websocket'
@@ -44,6 +45,7 @@ app.route('/api', problemRoutes)
 app.route('/api', problemStatsRoutes)
 app.route('/api', submissionRoutes)
 app.route('/api', trialRunRoutes)
+app.route('/api', mascotRoutes)
 app.route('/api/admin', adminRoutes)
 
 // 没有这条的话，打错的接口地址回的是 Hono 默认的纯文本「404 Not Found」，前端 utils/api.ts 读不出

apps/api/src/judge/ast.ts

@@ -63,15 +63,74 @@ async function loadLanguage(language: string) {
   return loaded
 }
 
-function collectNodes(root: Node, type: string, result: Node[] = []) {
+type Match = (node: Node) => boolean
-  if (root.type === type) result.push(root)
+
-  for (const child of root.children) collectNodes(child, type, result)
+function collectNodes(root: Node, match: Match, result: Node[] = []) {
+  if (match(root)) result.push(root)
+  for (const child of root.children) collectNodes(child, match, result)
   return result
 }
 
-function hasNode(root: Node, type: string): boolean {
+function hasNode(root: Node, match: Match): boolean {
-  if (root.type === type) return true
+  if (match(root)) return true
-  return root.children.some((child) => hasNode(child, type))
+  return root.children.some((child) => hasNode(child, match))
+}
+
+const ofType =
+  (type: string): Match =>
+  (node) =>
+    node.type === type
+
+/** C / C++ 函数定义的函数名：`int *f()` 的名字在 pointer_declarator 里面一层，沿着 declarator 往里找 */
+function functionName(definition: Node) {
+  let declarator = definition.childForFieldName('declarator')
+  while (declarator && declarator.type !== 'function_declarator') declarator = declarator.childForFieldName('declarator')
+  return declarator?.childForFieldName('declarator')?.text
+}
+
+/**
+ * 语法 target 认哪些节点。多数就是比节点类型，例外：
+ *
+ * C / C++ 的「函数定义」不算 `main` —— 每个 C 程序都有 main，算进去的话「必须使用函数定义」
+ * 永远通过、「不能使用」永远失败，老师选它要的是「自己写了函数」。所以 C 那边叫「自定义函数」。
+ *
+ * Python 的「赋值语句」连 `s += 1` 一起算 —— 和 C 一个口径（C 的 assignment_expression
+ * 本来就包括 `+=`），学生也是这么理解的。tree-sitter-python 里 `+=` 是单独的 augmented_assignment。
+ */
+function nodeMatch(target: string, language: string): Match {
+  const type = astTargetNodeType(target, language)
+  if (target === 'function_definition' && language !== 'Python') {
+    return (node) => node.type === type && functionName(node) !== 'main'
+  }
+  if (target === 'assignment' && language === 'Python') {
+    return (node) => node.type === type || node.type === 'augmented_assignment'
+  }
+  return ofType(type)
+}
+
+/**
+ * 运算符只认真在做运算的那一个 token。光比 token 的话，下面这些全都算「用了」：
+ * C 的 `scanf("%d", &n)` 算 `&`、`int *p` 算 `*`，C++ 的 `vector<int>` 算 `>`，
+ * Python 的 `*args` / `from m import *` 算 `*`、`**kw` 算 `**`、`not in` / `is not` 算 `not`、
+ * `case 1 | 2` 算 `|`。所以看它的父节点：二元运算、复合赋值、自增自减。
+ *
+ * 一元的只认取反（`!x` / `not x`）。负号 `-x` 不算「用了减号」，同理 `*p` 不算乘、`&n` 不算按位与。
+ */
+const OPERATOR_PARENTS: Record<string, string[]> = {
+  C: ['binary_expression', 'assignment_expression', 'update_expression'],
+  'C++': ['binary_expression', 'assignment_expression', 'update_expression'],
+  Python: ['binary_operator', 'boolean_operator', 'comparison_operator', 'augmented_assignment'],
+}
+const NOT_PARENTS: Record<string, string[]> = {
+  C: ['unary_expression'],
+  'C++': ['unary_expression'],
+  Python: ['not_operator'],
+}
+
+function operatorMatch(target: string, language: string): Match {
+  const type = astTargetNodeType(target, language)
+  const parents = (target === 'not' ? NOT_PARENTS : OPERATOR_PARENTS)[language] ?? []
+  return (node) => node.type === type && node.parent !== null && parents.includes(node.parent.type)
 }
 
 function targetName(rule: AstRule, language?: string) {
@@ -201,6 +260,10 @@ export function astRulesError(astRules: AstRules | null): string | null {
         if (!rule.keyword?.trim()) return `${at}：参数名不能为空`
       }
       if (!astRuleIsMeaningful(rule)) return `${at}：次数检查至少要填一个数字`
+      if ([rule.exact, rule.min, rule.max].some((n) => n !== undefined && n < 0)) return `${at}：次数不能是负数`
+      if (rule.min !== undefined && rule.max !== undefined && rule.min > rule.max) {
+        return `${at}：至少 ${rule.min} 次比至多 ${rule.max} 次还多，怎么写都过不了`
+      }
     }
   }
   return null
@@ -238,12 +301,32 @@ const CALL_NODE_TYPES: Record<string, string> = {
   Python: 'call',
 }
 
+/** `import math` / `import numpy as np` 引进来的模块名。`import os.path` 绑定的是 `os` */
+function importedModules(root: Node) {
+  const names = new Set<string>()
+  for (const statement of collectNodes(root, ofType('import_statement'))) {
+    for (const item of statement.namedChildren) {
+      const name = item.type === 'aliased_import' ? item.childForFieldName('alias') : item.type === 'dotted_name' ? item.namedChildren[0] : null
+      if (name) names.add(name.text)
+    }
+  }
+  return names
+}
+
 function functionCalls(root: Node, target: string, language: string) {
   const callType = CALL_NODE_TYPES[language] ?? 'call'
-  return collectNodes(root, callType).filter((call) => {
+  // Python 的 `math.sqrt(4)` 也算调用了 sqrt() —— 和 `from math import sqrt` 后写 `sqrt(4)`
+  // 是一回事，老师配「必须调用 sqrt()」时想的就是它。只认 import 进来的模块，
+  // `s.count()` 这种对象上的方法还是归「调用方法」
+  const modules = language === 'Python' ? importedModules(root) : null
+  return collectNodes(root, ofType(callType)).filter((call) => {
     const fn = call.childForFieldName('function')
     if (!fn) return false
     if (fn.type === 'identifier') return fn.text === target
+    if (modules && fn.type === 'attribute') {
+      const object = fn.childForFieldName('object')
+      return object?.type === 'identifier' && modules.has(object.text) && fn.childForFieldName('attribute')?.text === target
+    }
     // `std::sort(...)` 是 qualified_identifier。学生写 sort 还是 std::sort 取决于
     // 有没有 using namespace std，两种都得认，所以末段也比一次
     if (language === 'C++' && fn.type === 'qualified_identifier') {
@@ -265,13 +348,13 @@ function methodCalls(root: Node, target: string, language: string) {
   // 和 Python 的 attribute 不是一回事 —— 少了这个分支，C++ 的「必须调用 .push_back()」
   // 会静默地永远失败
   if (language === 'C++') {
-    return collectNodes(root, 'call_expression').filter((call) => {
+    return collectNodes(root, ofType('call_expression')).filter((call) => {
       const fn = call.childForFieldName('function')
       return fn?.type === 'field_expression' && fn.childForFieldName('field')?.text === target
     })
   }
   if (language !== 'Python') return []
-  return collectNodes(root, 'call').filter((call) => {
+  return collectNodes(root, ofType('call')).filter((call) => {
     const fn = call.childForFieldName('function')
     return fn?.type === 'attribute' && fn.childForFieldName('attribute')?.text === target
   })
@@ -279,20 +362,20 @@ function methodCalls(root: Node, target: string, language: string) {
 
 function evaluateRule(root: Node, rule: AstRule, language: string): AstResult | null {
   const target = rule.target ?? ''
-  const nodeType = astTargetNodeType(target, language)
+  const match = rule.engine === 'must_use_operator' ? operatorMatch(target, language) : nodeMatch(target, language)
 
   switch (rule.engine) {
     case 'must_exist_node':
       return {
         description: describeAstRule(rule, language),
-        passed: hasNode(root, nodeType),
+        passed: hasNode(root, match),
       }
     case 'must_not_exist_node': {
-      const nodes = collectNodes(root, nodeType)
+      const nodes = collectNodes(root, match)
       return withLines({ description: describeAstRule(rule, language), passed: nodes.length === 0 }, nodes)
     }
     case 'count_node': {
-      const nodes = collectNodes(root, nodeType)
+      const nodes = collectNodes(root, match)
       return withLines(
         {
           description: describeAstRule(rule, language),
@@ -335,7 +418,7 @@ function evaluateRule(root: Node, rule: AstRule, language: string): AstResult |
     case 'must_use_operator':
       return {
         description: describeAstRule(rule, language),
-        passed: hasNode(root, nodeType),
+        passed: hasNode(root, match),
       }
     case 'must_use_keyword':
       return {
@@ -345,9 +428,8 @@ function evaluateRule(root: Node, rule: AstRule, language: string): AstResult |
     case 'must_have_nesting': {
       const outer = rule.outer ?? ''
       const inner = rule.inner ?? ''
-      const outerType = astTargetNodeType(outer, language)
+      const innerMatch = nodeMatch(inner, language)
-      const innerType = astTargetNodeType(inner, language)
+      const passed = collectNodes(root, nodeMatch(outer, language)).some((node) => node.children.some((child) => hasNode(child, innerMatch)))
-      const passed = collectNodes(root, outerType).some((node) => node.children.some((child) => hasNode(child, innerType)))
       return { description: describeAstRule(rule, language), passed }
     }
     default:

apps/api/src/routes/mascot.ts

@@ -0,0 +1,176 @@
+import { mascotEventSchema, type MascotProfile } from '@oj2/contract'
+import { and, count, countDistinct, desc, eq, gte, inArray, isNull, sql } from 'drizzle-orm'
+import { Hono } from 'hono'
+
+import { requireAuth, type AppEnv } from '../auth/middleware'
+import { db, schema } from '../db'
+import { parseBody, success } from '../http'
+import { JudgeStatus } from '../judge/status'
+import { calendarDay, dayNumber, dayStart, weekStart } from '../time'
+
+export const mascotRoutes = new Hono<AppEnv>()
+
+/**
+ * 每人每分钟最多记这么多条。正常点她一分钟到不了十条（连点只记开头、彩蛋和嫌烦那几下），
+ * 拿脚本刷的才会撞上；撞上了就静默丢掉，不报错 —— 前台本来也不等这个结果
+ */
+const EVENTS_PER_MINUTE = 30
+const windows = new Map<number, { start: number; count: number }>()
+
+function allow(userId: number) {
+  const now = Date.now()
+  const entry = windows.get(userId)
+  if (!entry || now - entry.start >= 60_000) {
+    windows.set(userId, { start: now, count: 1 })
+    // 顺手清掉过期的，免得 Map 跟着在线人数一直涨
+    if (windows.size > 2000) for (const [id, it] of windows) if (now - it.start >= 60_000) windows.delete(id)
+    return true
+  }
+  entry.count++
+  return entry.count <= EVENTS_PER_MINUTE
+}
+
+/** 记一条看板娘互动（种类见契约 mascotEventSchema） */
+mascotRoutes.post('/mascot/events', requireAuth, async (c) => {
+  const parsed = await parseBody(c, mascotEventSchema, '看板娘记录的格式不对')
+  if (!parsed.success) return parsed.response
+  const user = c.get('user')!
+  if (allow(user.id)) {
+    const { kind, situation, line, action, path } = parsed.data
+    await db.insert(schema.mascotEvent).values({ userId: user.id, kind, situation, line, action, path })
+  }
+  return success(c, null)
+})
+
+/** 跨天记得的事只翻这么多天以内的 */
+const MEMORY_DAYS = 7
+
+/** 几个东八区日历日以前；不在 MEMORY_DAYS 以内、或之后已经说过那句了，就是 null */
+function daysAgo(at: string | null, saidAt: string | null) {
+  // 按时刻比，别按字符串：库里出来的带微秒、位数不一定一样
+  if (!at || (saidAt && Date.parse(saidAt) > Date.parse(at))) return null
+  const days = dayNumber(calendarDay()) - dayNumber(calendarDay(at))
+  return days >= 1 && days <= MEMORY_DAYS ? days : null
+}
+
+/** 跨天记得的事（契约 mascotProfileSchema.memory），一条语句查完 */
+async function memoryOf(userId: number) {
+  const today = dayStart()
+  const since = new Date(Date.parse(today) - MEMORY_DAYS * 86_400_000).toISOString()
+  const e = schema.mascotEvent
+  /** 7 天内最后一次。`beforeToday`：今天的事不算「记得」，只取今天以前的 */
+  const last = (kind: string, situation: string | null, beforeToday: boolean) => sql`(
+    select max(${e.createdAt}) from ${e}
+    where ${e.userId} = ${userId} and ${e.kind} = ${kind}
+      ${situation ? sql`and ${e.situation} = ${situation}` : sql``}
+      and ${e.createdAt} >= ${since}
+      ${beforeToday ? sql`and ${e.createdAt} < ${today}` : sql``}
+  )`
+  const s = schema.submission
+  const [row] = await db.execute<{
+    sulk_at: string | null
+    grudge_at: string | null
+    pat_at: string | null
+    pat_said_at: string | null
+    closer_at: string | null
+    solved_before: number
+  }>(sql`
+    select
+      ${last('open', 'sulk', true)} as sulk_at,
+      ${last('open', 'memory.grudge', false)} as grudge_at,
+      ${last('pat', null, true)} as pat_at,
+      ${last('open', 'memory.pat', false)} as pat_said_at,
+      ${last('open', 'memory.closer', false)} as closer_at,
+      (
+        select count(distinct ${s.problemId})::int from ${s}
+        where ${s.userId} = ${userId} and ${s.result} in (${JudgeStatus.ACCEPTED}, ${JudgeStatus.AST_CHECK_FAILED})
+          and ${s.createTime} < ${today}
+      ) as solved_before
+  `)
+  return {
+    grudgeDaysAgo: daysAgo(row?.sulk_at ?? null, row?.grudge_at ?? null),
+    patDaysAgo: daysAgo(row?.pat_at ?? null, row?.pat_said_at ?? null),
+    solvedBeforeToday: row?.solved_before ?? 0,
+    closerSaidToday: !!row?.closer_at && Date.parse(row.closer_at) >= Date.parse(today),
+  }
+}
+
+/** 最近多少次题库提交拿来看学生常犯哪类错 */
+const RECENT_SUBMISSIONS = 20
+
+/** 看板娘按学生的行为挑话用的那几个数（契约 mascotProfileSchema） */
+mascotRoutes.get('/mascot/profile', requireAuth, async (c) => {
+  const userId = c.get('user')!.id
+  const s = schema.submission
+
+  const week = weekStart()
+  const e = schema.mascotEvent
+  const [pokes, solved, memory, today, recent, tooHard, weekSubmits, weekEvents, weekHints] = await Promise.all([
+    db
+      .select({ value: count() })
+      .from(schema.mascotEvent)
+      .where(and(eq(schema.mascotEvent.userId, userId), eq(schema.mascotEvent.kind, 'open'))),
+    // 成就每次判完都重数一遍存进 user_stat，直接读，不再按提交现数
+    db
+      .select({ value: sql<number>`coalesce((${schema.userStat.metrics}->>'accepted_count')::int, 0)` })
+      .from(schema.userStat)
+      .where(eq(schema.userStat.userId, userId)),
+    memoryOf(userId),
+    db
+      .select({ value: countDistinct(s.problemId) })
+      .from(s)
+      .where(and(eq(s.userId, userId), eq(s.result, 0), gte(s.createTime, dayStart()))),
+    db
+      .select({ result: s.result, errorType: sql<string | null>`${s.statisticInfo}->'runtime_error'->>'type'` })
+      .from(s)
+      .where(and(eq(s.userId, userId), isNull(s.contestId)))
+      .orderBy(desc(s.createTime))
+      .limit(RECENT_SUBMISSIONS),
+    db
+      .select({ value: count() })
+      .from(schema.reaction)
+      .where(and(eq(schema.reaction.userId, userId), eq(schema.reaction.type, 'too_hard'))),
+    db
+      .select({ value: count() })
+      .from(s)
+      .where(and(eq(s.userId, userId), isNull(s.contestId), gte(s.createTime, week))),
+    db
+      .select({ kind: e.kind, value: count() })
+      .from(e)
+      .where(and(eq(e.userId, userId), inArray(e.kind, ['trial', 'help']), gte(e.createdAt, week)))
+      .groupBy(e.kind),
+    db
+      .select({ value: count() })
+      .from(schema.aiHint)
+      .innerJoin(s, eq(s.id, schema.aiHint.submissionId))
+      .where(and(eq(s.userId, userId), gte(schema.aiHint.createTime, week))),
+  ])
+  const eventCount = (kind: string) => weekEvents.find((row) => row.kind === kind)?.value ?? 0
+
+  const types = new Map<string, number>()
+  for (const row of recent) if (row.result === 4 && row.errorType) types.set(row.errorType, (types.get(row.errorType) ?? 0) + 1)
+  const topType = [...types.entries()].sort((a, b) => b[1] - a[1])[0]?.[0] ?? null
+  const tally = (...results: number[]) => recent.filter((row) => results.includes(row.result)).length
+
+  return success(c, {
+    pokes: pokes[0]?.value ?? 0,
+    solved: solved[0]?.value ?? 0,
+    memory,
+    todaySolved: today[0]?.value ?? 0,
+    tooHard: tooHard[0]?.value ?? 0,
+    week: {
+      submits: weekSubmits[0]?.value ?? 0,
+      trials: eventCount('trial'),
+      helps: eventCount('help'),
+      aiHints: weekHints[0]?.value ?? 0,
+    },
+    recent: {
+      total: recent.length,
+      wrongAnswer: tally(-1),
+      compileError: tally(-2),
+      runtimeError: tally(4, 3),
+      timeout: tally(1, 2),
+      runtimeErrorType: topType,
+    },
+  } satisfies MascotProfile)
+})

apps/api/src/routes/problem.ts

@@ -12,6 +12,7 @@ import {
   type ProblemListItem,
   type ProblemProgress,
   type ProblemTypeFilter,
+  type SimilarProblem,
   type Tag,
 } from '@oj2/contract'
 import { and, asc, count, countDistinct, desc, eq, ilike, inArray, isNull, ne, notInArray, or, sql } from 'drizzle-orm'
@@ -327,13 +328,25 @@ problemRoutes.get('/challenges', requireAuth, async (c) => {
 
 problemRoutes.get('/problems/:displayId/similar', optionalAuth, async (c) => {
   const [target] = await db
-    .select({ id: schema.problem.id })
+    .select({ id: schema.problem.id, difficulty: schema.problem.difficulty })
     .from(schema.problem)
     .where(and(sql`lower(${schema.problem.displayId}) = lower(${c.req.param('displayId')})`, isNull(schema.problem.contestId)))
     .limit(1)
   if (!target) return failure(c, 404, 'problem-not-found', 'Problem not found')
-  const targetTags = await db.select({ id: schema.problemTags.problemtagId }).from(schema.problemTags).where(eq(schema.problemTags.problemId, target.id))
+  // 知识点和主题标签一样算（用户 2026-11-03 定：同一套题材也算相似）。知识点排在前面
-  if (targetTags.length === 0) return success(c, [])
+  // 只是为了「共同的标签」那行先写练的是什么
+  const targetTags = await db
+    .select({ id: schema.problemTags.problemtagId, name: schema.problemTag.name })
+    .from(schema.problemTags)
+    .innerJoin(schema.problemTag, eq(schema.problemTags.problemtagId, schema.problemTag.id))
+    .where(eq(schema.problemTags.problemId, target.id))
+    // 同一类里大的在前，和题目列表「知识点」那列一样
+    .orderBy(
+      sql`${schema.problemTag.category} = 'knowledge' desc`,
+      sql`(select count(*) from ${schema.problemTags} pt where pt.problemtag_id = ${schema.problemTag.id}) desc`,
+      asc(schema.problemTag.name),
+    )
+  if (targetTags.length === 0) return success(c, [] satisfies SimilarProblem[])
   // 「已 AC 的不再推荐」必须下推到 SQL。早先是先 limit(5) 再在内存里筛，刷题多的
   // 学生 5 条候选能被筛到只剩一两条、甚至清零（前端 v-if 一空整块就不渲染）——
   // 而这个接口恰好只在**刚 AC** 或**连挂三次**时才被调用，正是候选最容易全中的时候。
@@ -343,7 +356,12 @@ problemRoutes.get('/problems/:displayId/similar', optionalAuth, async (c) => {
   const solvedIds = states ? [...states.solved] : []
   // difficulty 是 text（Low / Mid / High），直接 order by 走的是字典序 ——
   // High 排在 Low 前面，「由易到难」会变成「最难的先上」。按语义显式排。
+  // 共同标签一样多时先给和原题难度最接近的：原来一律简单的在前，做对一道困难题，
+  // 五条推荐里三条多是简单题（本地库 35 道困难题：119 / 175）。再并列才先简单的，
+  // 照顾连错三次的人
+  const rankOf = (difficulty: string) => (difficulty === 'Low' ? 0 : difficulty === 'Mid' ? 1 : 2)
   const difficultyRank = sql`case ${schema.problem.difficulty} when 'Low' then 0 when 'Mid' then 1 else 2 end`
+  const difficultyGap = sql`abs(${difficultyRank} - ${sql.raw(String(rankOf(target.difficulty)))})`
   const sharedTags = count(schema.problemTags.problemtagId)
   const rows = await db
     .select({
@@ -376,13 +394,16 @@ problemRoutes.get('/problems/:displayId/similar', optionalAuth, async (c) => {
     )
     .groupBy(schema.problem.id, schema.user.id, schema.userProfile.realName)
     // 末尾的 id 是稳定排序用的：并列时没有它，同一道题两次请求能返回不同的 5 条
-    .orderBy(desc(sharedTags), asc(difficultyRank), desc(schema.problem.acceptedNumber), asc(schema.problem.id))
+    .orderBy(desc(sharedTags), asc(difficultyGap), asc(difficultyRank), desc(schema.problem.acceptedNumber), asc(schema.problem.id))
     .limit(5)
   const ids = rows.map((row) => row.problem.id)
   const [tags, counts] = await Promise.all([getProblemTags(ids), problemUserCounts(ids)])
   return success(
     c,
-    rows.map((row) => listItem(row, tags, statuses, states, counts)),
+    rows.map((row) => {
+      const own = new Set(tags.get(row.problem.id))
+      return { ...listItem(row, tags, statuses, states, counts), sharedTags: targetTags.map((tag) => tag.name).filter((name) => own.has(name)) }
+    }) satisfies SimilarProblem[],
   )
 })
 

apps/api/src/services/achievement-metrics.ts

@@ -17,22 +17,22 @@ export const ACHIEVEMENT_METRICS: AchievementMetric[] = [
   {
     key: 'accepted_count',
     name: '做对的题数',
-    helpText: '去重后通过的题目数量（不含比赛）',
+    helpText: '去重后通过的题目数量（含比赛题）',
   },
   {
     key: 'mid_ac_count',
     name: '做对的中等题',
-    helpText: '去重后通过的中等难度题目数（不含比赛）',
+    helpText: '去重后通过的中等难度题目数（含比赛题）',
   },
   {
     key: 'hard_ac_count',
     name: '做对的困难题',
-    helpText: '去重后通过的困难题目数（不含比赛）',
+    helpText: '去重后通过的困难题目数（含比赛题）',
   },
   {
     key: 'submission_count',
     name: '提交次数',
-    helpText: '提交次数（不含比赛）',
+    helpText: '提交次数（含比赛）',
   },
   { key: 'active_days', name: '有提交的天数', helpText: '有过提交的累计天数' },
   {
@@ -45,13 +45,13 @@ export const ACHIEVEMENT_METRICS: AchievementMetric[] = [
   {
     key: 'max_ac_week_streak',
     name: '连续有新做对的周数',
-    helpText: '连续几个自然周（周一起）每周都至少新通过一道题（不含比赛）',
+    helpText: '连续几个自然周（周一起）每周都至少新通过一道题（含比赛题）',
   },
   { key: 'languages_used', name: '用过几种语言', helpText: '用过多少种编程语言' },
   {
     key: 'contest_joined',
     name: '参加比赛',
-    helpText: '参加过的比赛数量（本指标是比赛维度，不受比赛提交不计入的限制）',
+    helpText: '交过题的比赛数量',
   },
   { key: 'badge_count', name: '专题奖章', helpText: '获得的专题奖章数量' },
   {
@@ -59,6 +59,11 @@ export const ACHIEVEMENT_METRICS: AchievementMetric[] = [
     name: '做完的专题',
     helpText: '完成的专题数量',
   },
+  {
+    key: 'challenge_count',
+    name: '挑战成功',
+    helpText: '做对之后的挑战，做到了几条（每道题的每条挑战算一次）',
+  },
   {
     key: 'first_try_ac_count',
     name: '一次就对的题',
@@ -92,7 +97,7 @@ export const ACHIEVEMENT_METRICS: AchievementMetric[] = [
   {
     key: 'max_code_lines',
     name: '最长的代码行数',
-    helpText: '做对的提交里最长的代码有多少行（空行不算，不含比赛）',
+    helpText: '做对的提交里最长的代码有多少行（空行不算，含比赛）',
   },
   {
     key: 'achievement_unlocked_count',

apps/api/src/services/achievements.ts

@@ -1,4 +1,4 @@
-import { and, count, countDistinct, eq, inArray, isNotNull, isNull, lt, ne, notInArray, sql } from 'drizzle-orm'
+import { and, count, countDistinct, eq, inArray, isNotNull, lt, ne, notInArray, sql } from 'drizzle-orm'
 
 import { db, schema, type DbOrTx } from '../db'
 import { publishAchievementNotification } from '../events'
@@ -82,12 +82,17 @@ const ACCEPTED_RESULTS = sql.join([sql`${JudgeStatus.ACCEPTED}`, sql`${JudgeStat
 
 /**
  * 「做对几道 / 中等几道 / 困难几道 / 一次就对几道」按定义从提交表现数，不再逐次 +1。
+ * 参加过几场比赛、挑战成功几次也在这里一起数。
  *
  * 原来是读一遍这道题之前的提交、判断「是不是第一次做对」再 +1，两处漏：同一个人同一道题
  * 两条提交挨着判完，两边都看见对方已经做对（都不加）或都还没做对（加两次）；重判一条
  * 做对的提交又会再加一次。2026-10 的库里 372 人的做对题数比实际多 1–4 道。
  * 现数是幂等的，怎么并发、怎么重判都是同一个答案。走 submission_public_metrics_idx，
  * 一个人的提交也就几百条。
+ *
+ * **比赛里的提交也算**（2026-11-03 起）：这里的比赛其实是单班测验，有的班整学期都在
+ * 比赛里做题，不算的话一个成就都拿不到。比赛题是单独的题目行，不会和题库里同一道题重复数。
+ * 个人主页 / 排名的做对题数（user_profile.accepted_number）仍然不含比赛，两边对不上是有意的。
  */
 async function solvedCounts(tx: DbOrTx, userId: number) {
   const [row] = await tx.execute<{
@@ -95,13 +100,15 @@ async function solvedCounts(tx: DbOrTx, userId: number) {
     mid: number
     hard: number
     first_try: number
+    contests: number
+    challenges: number
   }>(
     sql`
       with mine as (
-        select s.problem_id, s.result, s.create_time, s.id, p.difficulty
+        select s.problem_id, s.contest_id, s.result, s.create_time, s.id, p.difficulty
         from ${schema.submission} s
         join ${schema.problem} p on p.id = s.problem_id
-        where s.user_id = ${userId} and s.contest_id is null
+        where s.user_id = ${userId}
       )
       select
         count(distinct problem_id) filter (where result in (${ACCEPTED_RESULTS}))::int as accepted,
@@ -111,11 +118,13 @@ async function solvedCounts(tx: DbOrTx, userId: number) {
           select count(*)::int from (
             select distinct on (problem_id) result from mine order by problem_id, create_time, id
           ) first where result in (${ACCEPTED_RESULTS})
-        ) as first_try
+        ) as first_try,
+        count(distinct contest_id)::int as contests,
+        (select count(*)::int from ${schema.challengeSuccess} where user_id = ${userId}) as challenges
       from mine
     `,
   )
-  return row ?? { accepted: 0, mid: 0, hard: 0, first_try: 0 }
+  return row ?? { accepted: 0, mid: 0, hard: 0, first_try: 0, contests: 0, challenges: 0 }
 }
 
 /**
@@ -130,7 +139,7 @@ export async function updateAchievementsForSubmission(submissionId: string, coun
     .innerJoin(schema.problem, eq(schema.submission.problemId, schema.problem.id))
     .where(eq(schema.submission.id, submissionId))
     .limit(1)
-  if (!row || row.submission.contestId !== null) return []
+  if (!row) return []
 
   const rejudged = countedAs !== null
   const accepted = isAccepted(row.submission.result)
@@ -157,6 +166,8 @@ export async function updateAchievementsForSubmission(submissionId: string, coun
     value.mid_ac_count = solved.mid
     value.hard_ac_count = solved.hard
     value.first_try_ac_count = solved.first_try
+    value.contest_joined = solved.contests
+    value.challenge_count = solved.challenges
     if (!rejudged) value.submission_count = numberMetric(value, 'submission_count') + 1
     if (firstAc) {
       // 只数这条之前的：重判一条老提交时，它后面的提交不算「做对之前错的」
@@ -167,7 +178,6 @@ export async function updateAchievementsForSubmission(submissionId: string, coun
           and(
             eq(schema.submission.userId, row.submission.userId),
             eq(schema.submission.problemId, row.submission.problemId),
-            isNull(schema.submission.contestId),
             lt(schema.submission.createTime, row.submission.createTime),
           ),
         )
@@ -301,7 +311,7 @@ export async function rescanAchievement(achievementId: number) {
   const metric = findMetric(achievement.metric)
   if (!metric) return { scanned: 0, unlocked: 0 }
 
-  // contest_joined 不由判题结算维护，扫之前先把它刷新一遍，否则永远读到旧值（或没有值）
+  // contest_joined 判题结算从 2026-11-03 起才维护，那之后没再交过题的人还是旧值，扫之前刷新一遍
   if (achievement.metric === 'contest_joined') await refreshContestJoinedForAll()
   // max_ac_week_streak 是后加的指标，判题结算只从上线那天起累计，存量用户要从提交记录补算
   if (achievement.metric === 'max_ac_week_streak') await refreshAcWeekStreakForAll()
@@ -482,7 +492,7 @@ async function refreshContestJoinedForAll() {
  * `_last_ac_week` / `_current_ac_week_streak` 一起写回 user_stat（jsonb 浅合并，
  * 其余指标不动，写法同 refreshContestJoinedForAll）。
  *
- * 「新通过」= 这道题（不含比赛）第一次通过的那次，和判题结算里 firstAc 同一个口径；
+ * 「新通过」= 这道题（含比赛题）第一次通过的那次，和判题结算里 firstAc 同一个口径；
  * 周按东八区自然周（周一起），SQL 里用 localTime 取墙上时间再 date_trunc。
  */
 async function refreshAcWeekStreakForAll() {
@@ -495,7 +505,7 @@ async function refreshAcWeekStreakForAll() {
     // 只算还在的用户：库里有提交的 user_id 已经对不上任何用户（submission.user_id 上没有
     // 外键，是历史遗留），直接写 user_stat 会撞 user_stat 的外键，整次重算失败
     .innerJoin(schema.user, eq(schema.user.id, schema.submission.userId))
-    .where(and(isNull(schema.submission.contestId), inArray(schema.submission.result, [JudgeStatus.ACCEPTED, JudgeStatus.AST_CHECK_FAILED])))
+    .where(inArray(schema.submission.result, [JudgeStatus.ACCEPTED, JudgeStatus.AST_CHECK_FAILED]))
     .groupBy(schema.submission.userId, schema.submission.problemId)
     .as('first_accepted')
   const week = sql<string>`to_char(date_trunc('week', ${localTime(firstAccepted.firstAt)}), 'YYYY-MM-DD')`

apps/web/src/oj/achievement/index.vue

@@ -6,6 +6,7 @@ import { useBreakpoints } from 'shared/composables/breakpoints'
 import UserName from 'shared/components/UserName.vue'
 import AdminLink from 'shared/components/AdminLink.vue'
 import { useUserStore } from 'shared/store/user'
+import { useMascotGuide } from 'shared/mascot/guide'
 import { RARITY_COLOR, RARITY_LABEL } from 'utils/constants'
 import type { AchievementList, AchievementRarity, UserBadge } from 'utils/types'
 import ClassCard from './components/ClassCard.vue'
@@ -59,6 +60,15 @@ async function load() {
 
 onMounted(load)
 watch(name, load)
+
+// 看板娘：只在看自己的成就时说话。「快拿到了」里最近的一个能说成「再做对 3 道」的，报它的名字；
+// 「还差 3 次」「一天做对 5 道」这种前面加不了「再」，往后找
+useMascotGuide(() => {
+  if (!data.value || other.value || userStore.isTeacherOrAbove) return null
+  const item = near.value.find((it) => it.remain.startsWith('再'))
+  if (!item) return { situation: 'achievement' }
+  return { situation: 'achievement.near', vars: { name: item.achievement.name, need: item.remain.slice(1) } }
+})
 </script>
 
 <template>

apps/web/src/oj/achievement/series.ts

@@ -34,6 +34,12 @@ const METRICS: Record<string, MetricInfo> = {
     unit: '道',
     remain: (r) => `再做对 ${r} 道困难题`,
   },
+  challenge_count: {
+    group: '做题',
+    label: '挑战成功',
+    unit: '次',
+    remain: (r) => `再挑战成功 ${r} 次`,
+  },
   max_ac_week_streak: {
     group: '坚持',
     label: '连着几周有做对',

apps/web/src/oj/announcement/list.vue

@@ -5,6 +5,7 @@ import AdminLink from 'shared/components/AdminLink.vue'
 import NotFound from 'shared/components/NotFound.vue'
 import { useBreakpoints } from 'shared/composables/breakpoints'
 import { useUserStore } from 'shared/store/user'
+import { useMascotGuide } from 'shared/mascot/guide'
 import { errorCode } from 'utils/api'
 import { parseTime, zonedParts, zonedYear } from 'utils/functions'
 import type { Announcement, AnnouncementListItem } from 'utils/types'
@@ -27,6 +28,9 @@ const { isDesktop } = useBreakpoints()
 const announcements = ref<AnnouncementListItem[]>([])
 const loaded = ref(false)
 
+// 看板娘：只念叨一句，不给按钮
+useMascotGuide(() => ({ situation: 'announcement' }))
+
 onMounted(async () => {
   const res = await getAnnouncementList(0, LIMIT)
   announcements.value = res.results

apps/web/src/oj/api.ts

@@ -41,6 +41,7 @@ import {
   type ProblemRank,
   type CreateSubmissionResponse,
   type ProblemListItem,
+  type SimilarProblem,
   type ProblemStats,
   type ProblemProgress,
   type CreateFlowchartResponse,
@@ -412,7 +413,9 @@ export function submitHintFeedback(hintId: number, helpful: boolean) {
 // ==================== 相似题目推荐 ====================
 
 export function getSimilarProblems(problemId: string) {
-  return api.get<ProblemListItem[]>(`problems/${encodeURIComponent(problemId)}/similar`).then((response) => response.map(toProblemRow))
+  return api
+    .get<SimilarProblem[]>(`problems/${encodeURIComponent(problemId)}/similar`)
+    .then((response) => response.map((item) => ({ ...toProblemRow(item), sharedTags: item.sharedTags })))
 }
 
 // ==================== 挑战 ====================

apps/web/src/oj/contest/list.vue

@@ -12,6 +12,7 @@ import { usePagination } from 'shared/composables/pagination'
 import AdminLink from 'shared/components/AdminLink.vue'
 import { useBreakpoints } from 'shared/composables/breakpoints'
 import { useUserStore } from 'shared/store/user'
+import { goAction, useMascotGuide } from 'shared/mascot/guide'
 import { ContestStatus } from 'utils/constants'
 import ContestBadge from './components/ContestBadge.vue'
 
@@ -115,6 +116,14 @@ function open(contest: Contest) {
   router.push(userStore.isTeacherOrAbove ? `/contest/${contest.id}/class` : `/contest/${contest.id}`)
 }
 
+// 看板娘：有正在比的就带进去
+useMascotGuide(() => {
+  if (userStore.isTeacherOrAbove) return null
+  const live = active.value.find((c) => c.status === ContestStatus.underway)
+  if (!live) return { situation: 'contests.none' }
+  return { situation: 'contests.live', actions: [goAction(router, '进比赛', `/contest/${live.id}`)] }
+})
+
 function mineText(contest: Contest) {
   const mine = contest.mine
   if (!mine) return ''

apps/web/src/oj/home/student.vue

@@ -5,12 +5,13 @@ import { Icon } from '@iconify/vue'
 import { getAnnouncementList, getKnowledgeMap, getContestList, getLastVisit, getLearnProgress, getSubmissions, getTutorials, getWeeklyRank } from 'oj/api'
 import { getClassActivity } from 'shared/api'
 import SubmissionResultTag from 'shared/components/SubmissionResultTag.vue'
-import { pickHeadline, type Headline } from 'oj/user/knowledge'
+import { levelName, MAX_LEVEL, pickHeadline, remainingToNext, tagLink, type Headline } from 'oj/user/knowledge'
 import { useUserStore } from 'shared/store/user'
 import { activityMode } from 'shared/store/lesson'
+import { focusJumpAction, goAction, randomProblemAction, useMascotGuide, type MascotAction, type MascotGuide } from 'shared/mascot/guide'
 import { ContestStatus, CONTEST_STATUS, JUDGE_STATUS, LANGUAGE_SHOW_VALUE } from 'utils/constants'
 import { duration, parseTime, zonedParts, zonedYear } from 'utils/functions'
-import type { AnnouncementListItem, ClassActivity, ClassActivityProblem, Contest, LastVisit, SubmissionListItem, WeeklyRank } from 'utils/types'
+import type { AnnouncementListItem, ClassActivity, ClassActivityProblem, Contest, KnowledgeMap, LastVisit, SubmissionListItem, WeeklyRank } from 'utils/types'
 
 interface Track {
   type: TutorialType
@@ -36,6 +37,8 @@ const classActivity = ref<ClassActivity | null>(null)
 const lastVisit = ref<LastVisit | null>(null)
 /** 知识点地图挑出来的那一句（本周升级 / 再做几道升档 / 去点亮一个），见 oj/user/knowledge.ts */
 const knowledgeHeadline = ref<Headline | null>(null)
+/** 地图原样留着给看板娘：她要知识点名、档位名、还差几道，不是拼好的那句话 */
+const knowledge = ref<KnowledgeMap | null>(null)
 const loaded = ref(false)
 
 /** 头一回登录、还没交过：问候换成「欢迎」，告诉他题在哪找 */
@@ -123,7 +126,8 @@ async function loadAnnouncements() {
 }
 
 async function loadKnowledge() {
-  knowledgeHeadline.value = pickHeadline(await getKnowledgeMap())
+  knowledge.value = await getKnowledgeMap()
+  knowledgeHeadline.value = pickHeadline(knowledge.value)
 }
 
 async function loadClassActivity() {
@@ -244,6 +248,86 @@ watch(
   { immediate: true },
 )
 
+// 看板娘：今天有课（和「这节课」那张卡同一个条件）就催今天的题，没课就随便做一道
+let greetedBack = false
+useMascotGuide(() => {
+  if (!loaded.value) return null
+  const random = randomProblemAction(router)
+  const learn = goAction(router, '自学', '/learn')
+  const lesson = classToday.value && !!classActivity.value?.problems.length
+  const next = nextProblem.value
+  if (lesson && next)
+    return { situation: 'home.assigned', actions: [goAction(router, '今天的题', `/problem/${next.problemDisplayId}`), focusJumpAction(), random] }
+  const base: MascotGuide = lesson
+    ? { situation: 'home.done', actions: [random, learn] }
+    : { situation: 'home.free', actions: [focusJumpAction(), random, learn] }
+  // 好久没来：只在这次进来后第一次点她时说，之后照常
+  if (awayDays.value >= 14 && !greetedBack) {
+    greetedBack = true
+    return { ...base, situation: 'home.back', n: awayDays.value }
+  }
+  // 这节课做完了或者没课：从别的数据里挑能说的，每点一次随机说一件，点几下听到的不一样
+  const extras = extraGuides(random)
+  return extras.length ? extras[Math.floor(Math.random() * extras.length)]! : base
+})
+
+const DAY_MS = 864e5
+
+function extraGuides(random: MascotAction): MascotGuide[] {
+  const list: MascotGuide[] = []
+
+  // 比赛：进行中，或者 24 小时内开始（那就只可能是今天或明天）
+  const now = Date.now()
+  const contest = contests.value.find((it) => it.status === ContestStatus.underway || Date.parse(it.startTime) - now < DAY_MS)
+  if (contest) {
+    const when = contest.status === ContestStatus.underway ? '现在' : dayKey(contest.startTime) === dayKey(new Date()) ? '今天' : '明天'
+    list.push({ situation: 'home.contestSoon', vars: { when }, actions: [goAction(router, '去看看', `/contest/${contest.id}`), random] })
+  }
+
+  // 公告：三天内发的，挑最新那条
+  const fresh = announcements.value.filter((it) => now - Date.parse(it.createTime) < 3 * DAY_MS).sort((a, b) => b.createTime.localeCompare(a.createTime))[0]
+  if (fresh) {
+    list.push({
+      situation: 'home.newAnnouncement',
+      actions: [{ label: '去看看', run: () => router.push({ path: '/announcement', query: { id: fresh.id } }) }, random],
+    })
+  }
+
+  // 知识点：和首页那一行同一个先后（本周升级 > 离下一档最近 > 班里在学、自己还没碰过），只说一件
+  const map = knowledge.value
+  if (map) {
+    const touched = new Set(map.classTouched)
+    const go = (name: string) => ({ label: '去做', run: () => router.push(tagLink(name)) })
+    const upgraded = map.tags.filter((tag) => tag.level > tag.levelAtWeekStart).sort((a, b) => b.level - a.level)[0]
+    const learning = map.tags
+      .filter((tag) => tag.level >= 1 && tag.level < MAX_LEVEL)
+      .sort((a, b) => Number(touched.has(b.name)) - Number(touched.has(a.name)) || remainingToNext(a)! - remainingToNext(b)!)[0]
+    const untouched = map.tags.find((tag) => tag.level === 0 && touched.has(tag.name))
+    if (upgraded)
+      list.push({ situation: 'home.knowledgeUp', vars: { tag: upgraded.name, level: levelName(upgraded.level) }, actions: [go(upgraded.name), random] })
+    else if (learning)
+      list.push({
+        situation: 'home.knowledgeNext',
+        n: remainingToNext(learning)!,
+        vars: { tag: learning.name, level: levelName(learning.level + 1) },
+        actions: [go(learning.name), random],
+      })
+    else if (untouched) list.push({ situation: 'home.knowledgeFresh', vars: { tag: untouched.name }, actions: [go(untouched.name), random] })
+  }
+
+  // 本周进步榜：第一就说第一；前一名在榜面上（只回前几名）、差得不多就报还要几道。
+  // 同分时提交少的在前，追平不一定超得过，所以按多做 1 道算
+  const me = weekly.value?.me
+  if (me) {
+    const rank = goAction(router, '去排名', '/rank?period=week')
+    const ahead = weekly.value!.results.find((row) => row.rank === me.rank - 1)
+    if (me.rank === 1) list.push({ situation: 'rank.top', actions: [rank, random] })
+    else if (ahead && ahead.solvedCount - me.solvedCount <= 5)
+      list.push({ situation: 'rank.gap', n: ahead.solvedCount - me.solvedCount + 1, actions: [rank, random] })
+  }
+  return list
+}
+
 function learnLink(track: Track) {
   return tutorialPath(track.type, track.step)
 }

apps/web/src/oj/home/teacher.vue

@@ -6,6 +6,7 @@ import { useThemeVars } from 'naive-ui'
 import { getAnnouncementList, getClassToday } from 'oj/api'
 import { classLabel } from 'utils/classes'
 import { useUserStore } from 'shared/store/user'
+import { goAction, useMascotGuide } from 'shared/mascot/guide'
 import { parseTime, zonedParts, zonedYear } from 'utils/functions'
 
 /**
@@ -66,6 +67,32 @@ function openTask(row: ClassRow) {
   router.push({ name: 'task', query: { className: row.className } })
 }
 
+/**
+ * 看板娘：今天有班布置了题，就带去那个班这节课的提交（和提交列表「这节课」同一组筛选：班、这几道题、今天），
+ * 有好几个班时挑正在上课的那个
+ */
+useMascotGuide(() => {
+  if (!today.value) return null
+  const assigned = today.value.classes.filter((row) => row.source === 'teacher' && row.problems.length)
+  const row = assigned.find((it) => stateOf(it).live) ?? assigned[0]
+  if (!row) return { situation: 'teacher.home.unassigned', actions: [goAction(router, '布置题目', '/task')] }
+  const query = { className: row.className, problem: row.problems.map((problem) => problem.problemDisplayId).join(','), today: '1' }
+  // 有人交过了就说这节课做完几个，还没人交就照旧那几句
+  const progress = row.activeCount
+    ? {
+        situation: row.allDoneCount >= row.rosterCount ? ('teacher.home.progressDone' as const) : ('teacher.home.progress' as const),
+        vars: { cls: classLabel(row.className), done: row.allDoneCount, total: row.rosterCount, left: row.rosterCount - row.allDoneCount },
+      }
+    : { situation: 'teacher.home.assigned' as const }
+  return {
+    ...progress,
+    actions: [
+      { label: '这节课的提交', run: () => router.push({ name: 'submissions', query }) },
+      { label: '课堂任务', run: () => openTask(row) },
+    ],
+  }
+})
+
 const shortcuts = computed(() =>
   [
     { label: '课堂任务', to: '/task', show: true },

apps/web/src/oj/learn/index.vue

@@ -6,6 +6,7 @@ import { useBreakpoints } from 'shared/composables/breakpoints'
 import { useAuthModalStore } from 'shared/store/authModal'
 import AdminLink from 'shared/components/AdminLink.vue'
 import { useUserStore } from 'shared/store/user'
+import { goAction, useMascotGuide } from 'shared/mascot/guide'
 import { COURSES, continueStep, doneCount, groupByProject, tutorialPath, tutorialState, splitProject, splitTitle, type TutorialType } from './utils'
 import TutorialRow from './components/TutorialRow.vue'
 import ProjectTile from './components/ProjectTile.vue'
@@ -94,6 +95,23 @@ function doneIn(course: Course, ids: number[]) {
   return ids.filter((id) => tutorialState(course.progress[id]) === 'done').length
 }
 
+// 看板娘：学过就带去「接着学」那一课，一课没学过就从当前页签那门课的第 1 课开始
+useMascotGuide(() => {
+  if (!loaded.value || userStore.isTeacherOrAbove) return null
+  const it = resume.value
+  if (it) {
+    const next = goAction(router, '接着学', tutorialPath(it.course.type, it.step))
+    // 接着学的那课之前，离它最近的一课打开过、练一练却没全对（「在学」那一态）：先叫回去看看
+    const { titles, progress } = it.course
+    for (let step = it.step - 1; step >= 1; step--) {
+      if (tutorialState(progress[titles[step - 1]!.id]) !== 'started') continue
+      return { situation: 'learn.wrongExercise', n: step, actions: [goAction(router, '去看看', tutorialPath(it.course.type, step)), next] }
+    }
+    return { situation: 'learn.continue', n: it.step, actions: [next] }
+  }
+  return { situation: 'learn.fresh', actions: [goAction(router, '第 1 课', tutorialPath(tab.value, 1))] }
+})
+
 watch(() => userStore.isAuthed, load)
 onMounted(load)
 </script>

apps/web/src/oj/learn/tutorial.vue

@@ -10,6 +10,7 @@ import { useBackClose } from 'shared/composables/backClose'
 import { useBreakpoints } from 'shared/composables/breakpoints'
 import AdminLink from 'shared/components/AdminLink.vue'
 import { useUserStore } from 'shared/store/user'
+import { useMascotGuide, type MascotAction } from 'shared/mascot/guide'
 import { COURSES, doneCount, groupByProject, tutorialPath, tutorialState, splitTitle, type TutorialType } from './utils'
 import TutorialBody from './components/TutorialBody.vue'
 import TutorialEnd from './components/TutorialEnd.vue'
@@ -233,6 +234,16 @@ function jump(id: string) {
 function jumpExercise(id: number) {
   jump(`exercise-${id}`)
 }
+
+// 看板娘：练一练没做完就带去第一道没做对的；做完了（或这课没有练一练）就去下一课
+useMascotGuide(() => {
+  if (!tutorial.value || userStore.isTeacherOrAbove) return null
+  const to = next.value?.to
+  const nextLesson: MascotAction[] = to ? [{ label: '下一课', run: () => router.push(to) }] : []
+  const unsolved = firstUnsolved.value
+  if (!unsolved) return { situation: 'tutorial.passed', actions: nextLesson }
+  return { situation: 'tutorial', actions: [{ label: '练一练', run: () => jumpExercise(unsolved.id) }, ...nextLesson] }
+})
 </script>
 
 <template>

apps/web/src/oj/pk/index.vue

@@ -6,6 +6,7 @@ import { classLabel, groupClassOptions } from 'utils/classes'
 import { useAIStream } from 'shared/composables/aiStream'
 import { useBreakpoints } from 'shared/composables/breakpoints'
 import { useUserStore } from 'shared/store/user'
+import { useMascotGuide } from 'shared/mascot/guide'
 import PkDuel from './components/PkDuel.vue'
 import PkGrid from './components/PkGrid.vue'
 import PkRace from './components/PkRace.vue'
@@ -31,6 +32,10 @@ const { isDesktop } = useBreakpoints()
 const MAX_CLASSES = 8
 
 const teacher = computed(() => userStore.isTeacherOrAbove)
+
+// 看板娘：学生念叨一句班级对决，老师只打招呼
+useMascotGuide(() => (teacher.value ? null : { situation: 'pk' }))
+
 const pk = ref<ClassPk | null>(null)
 const loading = ref(false)
 const battle = ref<ClassBattleItem[]>([])

apps/web/src/oj/problem/components/ProblemContent.vue

@@ -333,7 +333,7 @@ const astRequirements = computed(() => Object.entries(problem.value?.astRequirem
       <Markdown html :content="problem.source" />
     </section>
 
-    <SimilarProblems v-if="showSimilar" title="相似题目推荐" />
+    <SimilarProblems v-if="showSimilar" title="相似题目推荐" place="content" />
   </div>
 </template>
 

apps/web/src/oj/problem/components/SimilarProblems.vue

@@ -1,11 +1,13 @@
 <script lang="ts">
 import type { ProblemRow } from 'utils/types'
 
+type SimilarRow = ProblemRow & { sharedTags: string[] }
+
 /**
  * 同一道题两处（题面末尾、结果页签）都挂着时只拉一次。放在模块级：写在 setup 里就成了
  * 每个实例各一份
  */
-const cache = new Map<string, Promise<ProblemRow[]>>()
+const cache = new Map<string, Promise<SimilarRow[]>>()
 </script>
 
 <script setup lang="ts">
@@ -13,17 +15,27 @@ import { storeToRefs } from 'pinia'
 import { useThemeVars } from 'naive-ui'
 import { getSimilarProblems } from 'oj/api'
 import { useProblemStore } from 'oj/store/problem'
+import { useTone } from 'shared/composables/tone'
+import { problemTypes } from '../utils/problemType'
+import ProblemStatus from './ProblemStatus.vue'
+import ProblemTypeTag from './ProblemTypeTag.vue'
 
 /**
  * 相似题推荐。题面末尾（做对了、或者错了 3 次以上）和结果页签（不在课堂里的题做对之后）
  * 两处用：原来只在题面最底下，学生交完不会再滚回去看。什么时候出现由调用方的 v-if 决定。
+ * `place` 只管标题的样子：题面里和「提示」「来源」一样带绿竖条，结果页签里和「还能挑战」对齐。
+ *
+ * 每行第二行写和这道题共同的标签：不点开就知道练的是什么。行的写法照题目列表
+ * （灰题号、淡底难度、做对人数、类型标签、做过没对的红「−」）。整行可点，题目名
+ * 和题目列表一样用正文色、不用主题绿：绿字细、在白底上发虚
  */
-const props = defineProps<{ title: string }>()
+const props = defineProps<{ title: string; place: 'content' | 'result' }>()
 
 const theme = useThemeVars()
+const tone = useTone()
 
 const { problem } = storeToRefs(useProblemStore())
-const list = ref<ProblemRow[]>([])
+const list = ref<SimilarRow[]>([])
 
 watch(
   () => problem.value?._id,
@@ -41,30 +53,36 @@ watch(
   { immediate: true },
 )
 
-// getSimilarProblems 已经过 toProblemRow，难度是中文，不是 Low/Mid/High
+// 做对了的接口已经筛掉，剩下的只有「没做过」和「做过没对」两种；一道都没做过就不留这一列
-function difficultyType(difficulty: string) {
+const showStatus = computed(() => list.value.some((row) => row.status === 'failed'))
-  if (difficulty === '简单') return 'success'
+
-  if (difficulty === '困难') return 'error'
+const DIFFICULTY_TONE = { 简单: 'success', 中等: 'warning', 困难: 'error' } as const
-  return 'warning'
+
+function difficultyStyle(row: SimilarRow) {
+  if (!row.difficulty) return {}
+  const t = tone(DIFFICULTY_TONE[row.difficulty])
+  return { color: t.color, background: t.background }
 }
 </script>
 
 <template>
-  <section v-if="list.length" class="similar">
+  <section v-if="list.length" class="similar" :class="props.place">
-    <h3 class="title">{{ props.title }}</h3>
+    <h3 class="heading">{{ props.title }}</h3>
-    <n-list bordered>
+    <div class="rows">
-      <n-list-item v-for="sp in list" :key="sp._id">
+      <router-link v-for="sp in list" :key="sp._id" :to="{ name: 'problem', params: { problemID: sp._id } }" class="row" :class="{ 'with-status': showStatus }">
-        <n-flex align="center" justify="space-between" :wrap="false">
+        <span v-if="showStatus" class="status"><ProblemStatus :status="sp.status" /></span>
-          <router-link :to="{ name: 'problem', params: { problemID: sp._id } }" class="link">
+        <span class="id">{{ sp._id }}</span>
-            <n-tag size="small" :bordered="false">{{ sp._id }}</n-tag>
+        <span class="name">
-            <span class="name">{{ sp.title }}</span>
+          <span class="text">{{ sp.title }}</span>
-          </router-link>
+          <ProblemTypeTag v-for="kind in problemTypes(sp)" :key="kind" :kind="kind" />
-          <n-tag v-if="sp.difficulty" size="small" :type="difficultyType(sp.difficulty)">
+        </span>
-            {{ sp.difficulty }}
+        <span v-if="sp.difficulty" class="difficulty" :style="difficultyStyle(sp)">{{ sp.difficulty }}</span>
-          </n-tag>
+        <span class="shared">{{ sp.sharedTags.join(' · ') }}</span>
-        </n-flex>
+        <span class="people"
-      </n-list-item>
+          ><b>{{ sp.solvedUsers }}</b> 人做对</span
-    </n-list>
+        >
+      </router-link>
+    </div>
   </section>
 </template>
 
@@ -73,34 +91,135 @@ function difficultyType(difficulty: string) {
   margin-top: 20px;
 }
 
-.title {
+.similar.result {
-  font-size: 16px;
+  margin-top: 14px;
-  font-weight: 600;
+}
+
+.heading {
   margin: 0 0 8px;
 }
 
-/* 列表项的内容区默认按内容撑宽，长标题会把难度挤出屏幕，省略号也不出来 */
+/* 和 ProblemContent 的小节标题（提示 / 来源）一样 */
-.similar :deep(.n-list-item__main) {
+.content .heading {
-  min-width: 0;
+  font-size: 16px;
+  font-weight: 700;
+  line-height: 1.4;
+  padding-left: 9px;
+  border-left: 3px solid v-bind('theme.primaryColor');
 }
 
-.link {
+/* 和结果页签里的「还能挑战」一样 */
-  display: inline-flex;
+.result .heading {
+  font-size: 15px;
+  font-weight: 700;
+}
+
+.rows {
+  border: 1px solid v-bind('theme.dividerColor');
+  border-radius: 6px;
+  overflow: hidden;
+}
+
+/*
+ * 两行：题号 | 题目名 + 类型标签 | 难度
+ *            | 共同的标签       | 做对人数
+ * 做过没对的题最前面多一列红「−」
+ */
+.row {
+  display: grid;
+  grid-template-columns: auto minmax(0, 1fr) auto;
+  grid-template-areas:
+    'id name difficulty'
+    '. shared people';
   align-items: center;
-  gap: 8px;
+  gap: 4px 12px;
-  min-width: 0;
+  padding: 10px 16px;
-  color: inherit;
+  color: v-bind('theme.textColor1');
   text-decoration: none;
 }
 
-.link:hover .name {
+.row.with-status {
+  grid-template-columns: 16px auto minmax(0, 1fr) auto;
+  grid-template-areas:
+    'status id name difficulty'
+    '. . shared people';
+}
+
+.row + .row {
+  border-top: 1px solid v-bind('theme.dividerColor');
+}
+
+.row:hover {
+  background: v-bind('theme.hoverColor');
+}
+
+.row:hover .text {
   text-decoration: underline;
 }
 
+.status {
+  grid-area: status;
+  display: flex;
+  justify-content: center;
+}
+
+.id {
+  grid-area: id;
+  min-width: 36px;
+  font-size: var(--oj-fs-body);
+  color: v-bind('theme.textColor3');
+  font-variant-numeric: tabular-nums;
+}
+
 .name {
-  color: v-bind('theme.primaryColor');
+  grid-area: name;
+  min-width: 0;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.text {
+  min-width: 0;
+  font-size: var(--oj-fs-body);
+  font-weight: 500;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
+
+.difficulty {
+  grid-area: difficulty;
+  justify-self: end;
+  height: 22px;
+  padding: 0 7px;
+  border-radius: 4px;
+  font-size: var(--oj-fs-meta);
+  display: inline-flex;
+  align-items: center;
+}
+
+.shared {
+  grid-area: shared;
+  min-width: 0;
+  font-size: var(--oj-fs-sec);
+  color: v-bind('theme.textColor2');
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.people {
+  grid-area: people;
+  justify-self: end;
+  font-size: var(--oj-fs-sec);
+  color: v-bind('theme.textColor2');
+  font-variant-numeric: tabular-nums;
+  white-space: nowrap;
+}
+
+.people b {
+  font-weight: 600;
+  color: v-bind('theme.textColor1');
+}
 </style>

apps/web/src/oj/problem/components/SubmissionResult.vue

@@ -357,7 +357,7 @@ const columns: DataTableColumn<JudgeCaseResult>[] = [
           :language="submission.language"
           :refresh-key="submission.id"
         />
-        <SimilarProblems v-if="showSimilar" title="再练几道相似的" />
+        <SimilarProblems v-if="showSimilar" title="再练几道相似的" place="result" />
       </div>
     </template>
     <div v-show="!waitingReveal">

apps/web/src/oj/problem/composables/mascotGuide.ts

@@ -0,0 +1,273 @@
+import { useBreakpoints } from 'shared/composables/breakpoints'
+import { useMascotGuide, type MascotAction, type MascotGuide } from 'shared/mascot/guide'
+import { HINT_MIN_FAILURES, isFlowchartPass } from '@oj2/contract'
+import { habitSituation, logMascotEvent, refreshMascotProfile, requestSpeech } from 'shared/mascot/behavior'
+import { useChallengeStore } from 'oj/store/challenge'
+import { useFlowchartStore } from 'oj/store/flowchart'
+import type { MascotSituation } from 'shared/mascot/lines'
+import { useCollabStore } from 'shared/store/collab'
+import { useLessonStore } from 'shared/store/lesson'
+import { useUserStore } from 'shared/store/user'
+import { useCodeStore } from 'oj/store/code'
+import { useProblemStore } from 'oj/store/problem'
+import { useSubmissionStore, type ResultSegment } from 'oj/store/submission'
+import { SubmissionStatus } from 'utils/constants'
+import type { ProblemDetail } from 'utils/types'
+import { useProblemPageContext } from './problemPageContext'
+import { useTeacherCollab } from './teacherCollab'
+
+/** 同一道题错到这么多次，她就不怼了，劝去举手 */
+const STUCK_FAILS = 5
+/** 错过这么多次以后做对，算「终于」 */
+const FINALLY_FAILS = 2
+
+const RESULT_SITUATION: Partial<Record<SubmissionStatus, MascotSituation>> = {
+  [SubmissionStatus.wrong_answer]: 'problem.wrong',
+  [SubmissionStatus.partial_accepted]: 'problem.wrong',
+  [SubmissionStatus.ast_check_failed]: 'problem.wrong',
+  [SubmissionStatus.compile_error]: 'problem.compileError',
+  [SubmissionStatus.runtime_error]: 'problem.runtimeError',
+  [SubmissionStatus.memory_limit_exceeded]: 'problem.runtimeError',
+  [SubmissionStatus.cpu_time_limit_exceeded]: 'problem.timeout',
+  [SubmissionStatus.real_time_limit_exceeded]: 'problem.timeout',
+}
+
+/** 一道题上这么久没交、没跑例子，她就来问一句（主动开口） */
+const IDLE_MS = 15 * 60_000
+/** 连着这么多次没跑例子就交，而且错了，她就念一句 */
+const UNSAMPLED_SUBMITS = 3
+/** 同班做对这么多人，就拿出来说「全班已经 N 个人做对了」 */
+const CLASS_MANY = 5
+/** 同班交过这么多人、做对的不超过 CLASS_FEW 个，算「全班都卡着」 */
+const CLASS_TRIED = 5
+const CLASS_FEW = 2
+/** 全站交过这么多次，通过率才有意义 */
+const RATE_MIN_SUBMISSIONS = 30
+const HARD_RATE = 0.3
+const EASY_RATE = 0.7
+
+/** 几种「换个说法」各自的机会：不是每次都说同一件事 */
+const CHANCE = { classMany: 0.3, classFew: 0.5, rate: 0.4, hint: 0.5, challenge: 0.4 } as const
+const roll = (chance: number) => Math.random() < chance
+
+const FINISHED = (result: number | undefined) =>
+  result !== undefined && result !== SubmissionStatus.pending && result !== SubmissionStatus.judging && result !== SubmissionStatus.submitting
+
+/**
+ * 题目页上看板娘说什么、给哪几个按钮。看的是这一页上最近的那件事：刚交的结果、刚跑的例子，
+ * 都没有就看写没写代码。比赛入口不用管（Mascot.vue 在比赛里不弹）。
+ *
+ * 另外几件事她会主动开口（只对学生，频率上限在 Mascot.vue）：同一道题错到第 5 次、连着 3 次
+ * 没跑例子就交还错了、又犯了自己的老毛病（behavior.ts 的 habitSituation）、15 分钟没交没跑。
+ *
+ * `showResult` 是「我错在哪」：把左栏切到「结果」页签的那一段（提交结果 / 运行例子），页签归页面管。
+ */
+export function useProblemMascotGuide(showResult: (segment: ResultSegment) => void) {
+  const router = useRouter()
+  const userStore = useUserStore()
+  const problemStore = useProblemStore()
+  const submissionStore = useSubmissionStore()
+  const codeStore = useCodeStore()
+  const collabStore = useCollabStore()
+  const lessonStore = useLessonStore()
+  const ctx = useProblemPageContext()
+  const teacherCollab = useTeacherCollab()
+  const { isDesktop } = useBreakpoints()
+  const flowchartStore = useFlowchartStore()
+  const challengeStore = useChallengeStore()
+
+  /** 学生在这道题上能用的几个按钮，点她和她主动开口共用 */
+  function studentActions(problem: ProblemDetail) {
+    const language = codeStore.code.language
+    const entry = ctx.value
+    const runSamples: MascotAction | null =
+      problem.samples.length && language !== 'Flowchart' && language !== 'SQL' ? { label: '运行例子', run: submissionStore.runSamples } : null
+    // 和工具栏的「举手求助」同一个条件；已经举着手、老师在帮的时候不给
+    const help: MascotAction | null =
+      entry.help && isDesktop.value && !userStore.demoMode && language !== 'Flowchart' && collabStore.helpStatus === 'idle'
+        ? { label: '举手求助', run: () => collabStore.requestHelp(problem._id, language) }
+        : null
+    const why: MascotAction = { label: '我错在哪', run: () => showResult('submit') }
+    const whySamples: MascotAction = { label: '我错在哪', run: () => showResult('samples') }
+    const busy = submissionStore.isFormatting || submissionStore.isSubmittingRequest || submissionStore.judging || submissionStore.isCooldown
+    const submit: MascotAction | null = busy
+      ? null
+      : { label: '提交', run: () => submissionStore.submit({ contestId: entry.contestId, problemSetId: entry.problemSetId }) }
+    return { runSamples, help, why, whySamples, submit }
+  }
+
+  const guide = (situation: MascotSituation, ...actions: (MascotAction | null)[]): MascotGuide => ({
+    situation,
+    actions: actions.filter((it): it is MascotAction => !!it),
+  })
+
+  useMascotGuide(() => {
+    const problem = problemStore.problem
+    if (!problem) return null
+
+    if (userStore.isTeacherOrAbove) {
+      // 协作中别把老师带离这一页：跳走协作就断了
+      if (teacherCollab.value) return null
+      const actions: MascotAction[] = [{ label: '全班这题的提交', run: () => router.push({ name: 'submissions', query: { problem: problem._id } }) }]
+      if (isDesktop.value && userStore.canEditProblem(problem)) {
+        actions.push({ label: '编辑这道题', run: () => window.open(router.resolve(`/admin/problem/edit/${problem.id}`).href, '_blank') })
+      }
+      return { situation: 'teacher.problem', actions }
+    }
+
+    const entry = ctx.value
+    const { runSamples, help, why, whySamples, submit } = studentActions(problem)
+
+    if (codeStore.code.language === 'Flowchart') {
+      // 画过、评过分了：分低就说分低，拿了 S 夸一句
+      const grade = flowchartStore.latestRating.grade
+      if (grade === 'S') return guide('flowchart.good', help)
+      if (grade && !isFlowchartPass(grade)) return guide('flowchart.low', help)
+      return guide('problem.flowchart', help)
+    }
+    // 正在判、正在跑例子：没什么好说的，打个招呼
+    if (submissionStore.judging || submissionStore.pending || submissionStore.trial.samplesRunning.value) return null
+
+    const stuck = problemStore.failCount >= STUCK_FAILS
+    if (submissionStore.syntaxErrorInfo) return stuck ? guide('problem.stuck', help, why) : guide('problem.compileError', why, help)
+
+    const runs = submissionStore.trial.sampleRuns.value
+    if (submissionStore.resultSegment === 'samples' && runs.length) {
+      return runs.every((run) => run.result === SubmissionStatus.accepted)
+        ? guide('problem.samplesPassed', submit)
+        : guide('problem.samplesFailed', whySamples, help)
+    }
+
+    const result = submissionStore.submission?.result
+    const lesson = lessonStore.find(problem._id)
+    if (result === SubmissionStatus.accepted) {
+      const next = nextAction()
+      // 课堂条的数是拉的时候的，刚做对重拉回来可能已经把自己算进去了
+      if (lesson && lesson.acceptedCount <= (lesson.myStatus === 'accepted' ? 1 : 0)) return guide('class.firstSolver', next)
+      if (entry.challenges && challengeStore.current?.challenges.length && roll(CHANCE.challenge)) return guide('problem.challenge', next)
+      const fails = problemStore.failCount
+      return guide(fails === 0 ? 'problem.firstTry' : fails >= FINALLY_FAILS ? 'problem.finally' : 'problem.accepted', next)
+    }
+    const failed = result === undefined ? undefined : RESULT_SITUATION[result as SubmissionStatus]
+    if (failed) {
+      if (stuck) return guide('problem.stuck', help, why)
+      const actions = [why, failed === 'problem.wrong' ? runSamples : null, help]
+      // AI 提示开了还没要：提一句，按钮带去结果里（提示在那儿）
+      const hintOpen = !problem.contestId && problemStore.failCount >= HINT_MIN_FAILURES && !submissionStore.hint.hintContent.value
+      if (hintOpen && roll(CHANCE.hint)) return guide('problem.hintReady', ...actions)
+      const classGuide = classSituation(lesson)
+      if (classGuide) return { ...guide(classGuide.situation, ...actions), n: classGuide.n }
+      const rate = problem.submissionNumber >= RATE_MIN_SUBMISSIONS ? problem.acceptedNumber / problem.submissionNumber : null
+      if (rate !== null && rate < HARD_RATE && roll(CHANCE.rate)) return guide('problem.hardWrong', ...actions)
+      if (rate !== null && rate > EASY_RATE && failed === 'problem.wrong' && roll(CHANCE.rate)) return guide('problem.easyWrong', ...actions)
+      return guide(failed, ...actions)
+    }
+
+    // 这两种只说话、只留举手：上线第一天「做过了」的「下一道」没人点过，空着代码跑例子也没意义，
+    // 而空白页上「举手求助」是真有人点（不会下手）。没有按钮的气泡 5 秒自己收起，不一直挡着
+    if (problem.myStatus === SubmissionStatus.accepted) return guide('problem.solvedBefore')
+    if (codeStore.code.value.trim().length < 10) return guide(entry.entry === 'problemset' ? 'problem.inSet' : 'problem.blank', help)
+    const classGuide = classSituation(lesson)
+    if (classGuide?.situation === 'class.manyDone') return { ...guide('class.manyDone', runSamples, help), n: classGuide.n }
+    return guide('problem.unsubmitted', runSamples, help)
+
+    /** 这节课的题：同班多少人做对了（课堂条那份数），不在这节课里就没有 */
+    function classSituation(item: typeof lesson) {
+      if (!item || item.myStatus === 'accepted') return null
+      if (item.acceptedCount >= CLASS_MANY && roll(CHANCE.classMany)) return { situation: 'class.manyDone' as const, n: item.acceptedCount }
+      if (item.userCount >= CLASS_TRIED && item.acceptedCount <= CLASS_FEW && roll(CHANCE.classFew))
+        return { situation: 'class.fewDone' as const, n: item.acceptedCount }
+      return null
+    }
+
+    /** 做对之后去哪：专题里回专题，这节课里去下一道还没做的 */
+    function nextAction(): MascotAction | null {
+      if (entry.entry === 'problemset') return { label: '回专题', run: () => router.push(`/problemset/${entry.problemSetId}`) }
+      const next = lessonStore.nextAfter(problem!._id)?.next
+      return next ? { label: '下一道', run: () => router.push(`/problem/${next.problemDisplayId}`) } : null
+    }
+  })
+
+  // ---- 主动开口（只对学生；比赛里 Mascot.vue 不弹）----
+
+  const student = () => userStore.isAuthed && !userStore.isTeacherOrAbove && ctx.value.entry !== 'contest'
+
+  /** 这道题上连着几次没跑例子就交了。跑过一次例子就清零 */
+  let unsampledSubmits = 0
+  let sampledSinceSubmit = false
+  /** 上一次「动静」（进题、交、跑例子）的时刻，给「盯了好久」用 */
+  let lastActivity = Date.now()
+
+  watch(
+    () => problemStore.problem?.id,
+    () => {
+      unsampledSubmits = 0
+      sampledSinceSubmit = false
+      lastActivity = Date.now()
+    },
+  )
+  watch(
+    () => submissionStore.trial.samplesRunAt.value,
+    (at) => {
+      if (!at) return
+      sampledSinceSubmit = true
+      lastActivity = Date.now()
+      if (student()) logMascotEvent({ kind: 'trial', action: 'samples' })
+    },
+  )
+  // 「运行例子」「自己输入」「举手」别处都不存，记下来给她看一周的习惯（behavior.ts）
+  watch(
+    () => submissionStore.trial.customRunning.value,
+    (running) => {
+      if (!running) return
+      lastActivity = Date.now()
+      if (student()) logMascotEvent({ kind: 'trial', action: 'custom' })
+    },
+  )
+  watch(
+    () => collabStore.helpStatus,
+    (status, previous) => {
+      if (status === 'pending' && previous === 'idle' && student()) logMascotEvent({ kind: 'help' })
+    },
+  )
+  watch(
+    () => submissionStore.submission?.id,
+    (id) => {
+      if (!id) return
+      unsampledSubmits = sampledSinceSubmit ? 0 : unsampledSubmits + 1
+      sampledSinceSubmit = false
+      lastActivity = Date.now()
+    },
+  )
+
+  // 判完了：错了就看要不要说一句；不管对错都刷新行为数（最近的错、今天做对几道）
+  watch(
+    () => [submissionStore.submission?.id, submissionStore.submission?.result] as const,
+    ([id, result]) => {
+      const problem = problemStore.problem
+      if (!id || !FINISHED(result) || !problem || !student()) return
+      refreshMascotProfile(true)
+      const failed = RESULT_SITUATION[result as SubmissionStatus]
+      if (!failed) return
+      const { runSamples, help, why } = studentActions(problem)
+      if (problemStore.failCount >= STUCK_FAILS) {
+        requestSpeech({ key: `stuck:${problem.id}`, ...guide('problem.stuck', help, why) })
+      } else if (unsampledSubmits >= UNSAMPLED_SUBMITS && runSamples) {
+        requestSpeech({ key: `unsampled:${problem.id}`, ...guide('habit.noSamples', runSamples) })
+      } else {
+        const habit = habitSituation(failed)
+        if (habit) requestSpeech({ key: `habit:${habit}`, ...guide(habit, why) })
+      }
+    },
+  )
+
+  // 盯着一道没做对的题 15 分钟，没交也没跑：问一句
+  useIntervalFn(() => {
+    const problem = problemStore.problem
+    if (!problem || !student() || Date.now() - lastActivity < IDLE_MS) return
+    if (problem.myStatus === SubmissionStatus.accepted || submissionStore.submission?.result === SubmissionStatus.accepted) return
+    if (codeStore.code.language === 'Flowchart') return
+    const { runSamples, help } = studentActions(problem)
+    requestSpeech({ key: `idle:${problem.id}`, ...guide('idle.stuck', help, runSamples) })
+  }, 30_000)
+}

apps/web/src/oj/problem/composables/useFireworks.ts

@@ -14,28 +14,36 @@ const EMOJI_SVGS = [
 // 将 emoji SVG 转成 confetti 可用的彩色位图 Shape，缓存后供重复调用复用
 let emojiShapesPromise: Promise<confetti.Shape[]> | null = null
 
+/**
+ * 表情在屏幕上的边长（px）。位图就按这个大小画，放的时候 `scalar: 1`、矩阵不缩放。
+ *
+ * **别改回「位图画大、矩阵缩小、scalar 放大」**：canvas-confetti 画位图粒子是每帧
+ * `fillRect(位图边长 × scalar)` 再用图案填，填的矩形和表情实际多大无关。原来位图 64、
+ * scalar 5，表情显示 50px，每个粒子每帧却要填 320×320 —— 两团 32 个粒子一帧三百多万像素，
+ * 机房电脑（显卡弱、Chrome 常走软件渲染）放到这一种就卡（用户 2026-11 反馈）。
+ * 现在填的正好是 50×50，同样大小、同样轨迹，像素少到四十分之一。
+ */
+const EMOJI_PX = 50
+
 function svgToBitmapShape(svg: string): Promise<confetti.Shape> {
   return new Promise((resolve, reject) => {
     const blob = new Blob([svg], { type: 'image/svg+xml' })
     const url = URL.createObjectURL(blob)
     const img = new Image()
     img.onload = async () => {
-      const renderSize = 64
-      const baseUnit = 10
       const canvas = document.createElement('canvas')
-      canvas.width = renderSize
+      canvas.width = EMOJI_PX
-      canvas.height = renderSize
+      canvas.height = EMOJI_PX
       const ctx = canvas.getContext('2d')!
-      ctx.drawImage(img, 0, 0, renderSize, renderSize)
+      ctx.drawImage(img, 0, 0, EMOJI_PX, EMOJI_PX)
       URL.revokeObjectURL(url)
 
       try {
         const bitmap = await createImageBitmap(canvas)
-        const scale = baseUnit / renderSize
         resolve({
           type: 'bitmap',
           bitmap,
-          matrix: [scale, 0, 0, scale, (-renderSize * scale) / 2, (-renderSize * scale) / 2],
+          matrix: [1, 0, 0, 1, -EMOJI_PX / 2, -EMOJI_PX / 2],
         } as unknown as confetti.Shape)
       } catch (e) {
         reject(e)
@@ -415,7 +423,8 @@ export function useFireworks() {
           const options: confetti.Options = {
             shapes: emojiShapes,
             flat: true,
-            scalar: 5,
+            // 大小在位图里（EMOJI_PX），这里放大的话填的矩形跟着放大，见 EMOJI_PX
+            scalar: 1,
             particleCount: 16,
             spread: 360,
             startVelocity: 40,

apps/web/src/oj/problem/detail.vue

@@ -19,6 +19,7 @@ import ContextBar from './components/ContextBar.vue'
 import { useEditorMenu } from './composables/editorMenu'
 import { DRAWER_TITLE, useProblemPageContext, type ProblemDrawer as DrawerKey } from './composables/problemPageContext'
 import { useCollabHere, useTeacherCollab } from './composables/teacherCollab'
+import { useProblemMascotGuide } from './composables/mascotGuide'
 
 // 抽成具名 loader，便于进页面时与接口并行预取编辑器 chunk。
 // 题库、比赛、专题三种入口用的是同一个编辑器：原来比赛和专题用的是另一个精简版，
@@ -208,6 +209,13 @@ watch(
   },
 )
 
+// 看板娘气泡里的「我错在哪」：切到「结果」页签里出错的那一段
+useProblemMascotGuide((segment) => {
+  drawer.value = null
+  currentTab.value = 'result'
+  submissionStore.resultSegment = segment
+})
+
 // 结果页签的标题带状态图标（ResultTabLabel），n-tab-pane 的 tab 接受渲染函数
 const resultTab = () => h(ResultTabLabel, { active: currentTab.value === 'result' })
 

apps/web/src/oj/problem/list.vue

@@ -18,6 +18,7 @@ import { usePagination } from 'shared/composables/pagination'
 import { useAuthModalStore } from 'shared/store/authModal'
 import AdminLink from 'shared/components/AdminLink.vue'
 import { useUserStore } from 'shared/store/user'
+import { focusJumpAction, useMascotGuide, type MascotAction } from 'shared/mascot/guide'
 import ProblemStatus from './components/ProblemStatus.vue'
 import ProblemTypeTag from './components/ProblemTypeTag.vue'
 import ProgressRow from './components/ProgressRow.vue'
@@ -272,6 +273,18 @@ async function pickRandom() {
   }
 }
 
+// 看板娘：学生给找题的几条路（「随便来一道」按这页选着的知识点和类型挑），老师给新建题目
+useMascotGuide(() => {
+  if (teacher.value) {
+    return {
+      situation: 'teacher.problems',
+      actions: userStore.hasProblemPermission ? [{ label: '新建题目', run: () => router.push('/admin/problem/create') }] : [],
+    }
+  }
+  const undone: MascotAction | null = userStore.isAuthed && !undoneOn.value ? { label: '只看没做完', run: () => (undoneOn.value = true) } : null
+  return { situation: 'problems', actions: [focusJumpAction(), ...(undone ? [undone] : []), { label: '随便来一道', run: pickRandom }] }
+})
+
 // ---- 「只看没做完」下一道都没有了：说清楚为什么是空的，给两条路 ----
 const nextTag = computed(() => {
   const p = mine.value

apps/web/src/oj/problemset/detail.vue

@@ -8,6 +8,7 @@ import { parseTime } from 'utils/functions'
 import type { ProblemSet, ProblemSetProblem } from 'utils/types'
 import { useAuthModalStore } from 'shared/store/authModal'
 import { useUserStore } from 'shared/store/user'
+import { goAction, useMascotGuide } from 'shared/mascot/guide'
 import { useFireworks } from '../problem/composables/useFireworks'
 import NotFound from 'shared/components/NotFound.vue'
 import BadgeLadder from './components/BadgeLadder.vue'
@@ -122,6 +123,20 @@ async function join() {
   }
 }
 
+// 看板娘：老师看全班，学生还差几道必做题、带去下一道；没加入就只打招呼
+useMascotGuide(() => {
+  if (!set.value) return null
+  if (userStore.isTeacherOrAbove) return { situation: 'teacher.problemset', actions: [{ label: '全班情况', run: () => (tab.value = 'class') }] }
+  if (!joined.value) return null
+  const todo = problems.value.filter((item) => item.isRequired && !item.isCompleted)
+  const next = todo[0]
+  if (progress.value?.isCompleted || !next) return { situation: 'problemset.done', actions: [goAction(router, '专题列表', '/problemset')] }
+  const actions = [{ label: '去做下一道', run: () => router.push(problemLink(next)) }]
+  // 只剩最后一道、做完还有奖章没拿：说「就差最后 1 道」比「还差 1 道」更想让人做完
+  if (todo.length === 1 && set.value.badges.some((badge) => !badge.isEarned)) return { situation: 'problemset.lastOne', actions }
+  return { situation: 'problemset.unfinished', n: todo.length, actions }
+})
+
 /** 编辑只给出题人和超管（后台按归属校验，别人点进去是 404） */
 const canEdit = computed(() => !!set.value && (userStore.isSuperAdmin || set.value.createdBy.id === userStore.user?.id))
 

apps/web/src/oj/problemset/list.vue

@@ -3,6 +3,7 @@ import { useThemeVars } from 'naive-ui'
 import AdminLink from 'shared/components/AdminLink.vue'
 import { useBreakpoints } from 'shared/composables/breakpoints'
 import { useUserStore } from 'shared/store/user'
+import { goAction, useMascotGuide } from 'shared/mascot/guide'
 import { getProblemSetList } from 'oj/api'
 import { rgba, useTone } from 'shared/composables/tone'
 import { parseTime } from 'utils/functions'
@@ -55,6 +56,16 @@ const others = computed(() =>
     }),
 )
 
+// 看板娘：加入了还没做完的专题，布置中的优先，其次最近加入的
+useMascotGuide(() => {
+  if (userStore.isTeacherOrAbove) return null
+  const pending = sets.value.filter((set) => set.userProgress.isJoined && !set.userProgress.isCompleted)
+  const latest = (set: ProblemSet) => Date.parse(set.userProgress.joinTime ?? '') || 0
+  const target = pending.find((set) => set.assigning) ?? [...pending].sort((a, b) => latest(b) - latest(a))[0]
+  if (!target) return null
+  return { situation: 'problemsets.unfinished', actions: [goAction(router, '接着做', `/problemset/${target.id}`)] }
+})
+
 function description(set: ProblemSet) {
   // 简介大多就是把标题再抄一遍，一样的就不重复显示
   return set.description && set.description !== set.title ? set.description : ''

apps/web/src/oj/rank/list.vue

@@ -7,6 +7,7 @@ import UserName from 'shared/components/UserName.vue'
 import { useBreakpoints } from 'shared/composables/breakpoints'
 import { useConfigStore } from 'shared/store/config'
 import { useUserStore } from 'shared/store/user'
+import { useMascotGuide } from 'shared/mascot/guide'
 import { errorCode } from 'utils/api'
 import { displayName } from '@oj2/contract'
 import { STORAGE_KEY } from 'utils/constants'
@@ -271,6 +272,23 @@ function openDetail(className: string) {
   showDetail.value = true
 }
 
+// 看板娘：自己在榜上就把自己那一行滚到眼前（领奖台上是「你」那个标签，赛道上是高亮的那一行）
+useMascotGuide(() => {
+  if (teacher.value || !board.value) return null
+  const listed = rows.value.some((row) => row.user.id === meId.value)
+  const findMe = () => {
+    const el = document.querySelector('.track-card .entry.me, .track-card .prow.me, .track-card .tag.me')
+    el?.scrollIntoView({ behavior: 'smooth', block: 'center' })
+  }
+  const actions = listed ? [{ label: '我在哪', run: findMe }] : []
+  const { me: mine, ahead } = board.value
+  if (mine?.solved && mine.rank === 1) return { situation: 'rank.top', actions }
+  // 同分按先做到排，追平还在后面，所以要比前一名多做 1 道
+  const gap = mine && ahead ? ahead.solved - mine.solved : null
+  if (gap !== null && gap <= 5) return { situation: 'rank.gap', n: gap + 1, actions }
+  return { situation: 'rank', actions }
+})
+
 function open(username: string) {
   router.push({ path: '/user', query: { name: username } })
 }

apps/web/src/oj/rank/palette.ts

@@ -1,4 +1,4 @@
-import { useDark } from '@vueuse/core'
+import { useDark } from 'shared/composables/dark'
 
 /**
  * 排名页的几种颜色（设计稿「排名重设计」G1）。用户说「颜色可以保留」：你绿、前一名蓝、

apps/web/src/oj/statistics/index.vue

@@ -1,5 +1,6 @@
 <script setup lang="ts">
 import { useRouteQuery } from '@vueuse/router'
+import { useMascotGuide } from 'shared/mascot/guide'
 import StatisticsView from './components/StatisticsView.vue'
 import { DEFAULT_PERIOD } from './period'
 
@@ -19,6 +20,8 @@ const period = useRouteQuery<string>('period', DEFAULT_PERIOD, { mode: 'replace'
 const from = useRouteQuery<string>('from', '', { mode: 'replace' })
 const to = useRouteQuery<string>('to', '', { mode: 'replace' })
 
+useMascotGuide(() => ({ situation: 'teacher.statistics' }))
+
 function openList(query: Record<string, string>) {
   window.open(router.resolve({ name: 'submissions', query }).href, '_blank')
 }

apps/web/src/oj/submission/components/CodeView.vue

@@ -1,6 +1,6 @@
 <script setup lang="ts">
 import { useThemeVars } from 'naive-ui'
-import { useDark } from '@vueuse/core'
+import { useDark } from 'shared/composables/dark'
 
 /**
  * 只读的代码区：行号 + 高亮 + 可选地标红一行（编译失败 / 运行时错误报了行号时）。

apps/web/src/oj/submission/components/SubmissionPane.vue

@@ -23,6 +23,8 @@ import UserName from 'shared/components/UserName.vue'
  */
 const props = defineProps<{
   row: SubmissionListItem
+  /** 按 ↑ ↓ 会落到的上一条、下一条：这条加载完顺手把它们也拉回来，换条时不用等网络 */
+  neighbors?: SubmissionListItem[]
   /** 老师那套：重新判题、逐个测试点、复制两项收进「⋯」 */
   teacher: boolean
   /** 在比赛的提交列表里（不能重判，题目链接走比赛） */
@@ -61,7 +63,42 @@ const detail = ref<Submission | null>(null)
 const loading = ref(false)
 const failed = ref(false)
 
-const judging = computed(() => props.row.result === SubmissionStatus.pending || props.row.result === SubmissionStatus.judging)
+function isJudging(row: SubmissionListItem) {
+  return row.result === SubmissionStatus.pending || row.result === SubmissionStatus.judging
+}
+const judging = computed(() => isJudging(props.row))
+
+/**
+ * 同一条只发一次请求：预取的还在路上时按到了它，接着等那一个，不再发第二个
+ */
+const inflight = new Map<string, Promise<Submission>>()
+function fetchDetail(id: string) {
+  let request = inflight.get(id)
+  if (!request) {
+    request = getSubmission(id).finally(() => inflight.delete(id))
+    inflight.set(id, request)
+  }
+  return request
+}
+
+/**
+ * 预取上一条、下一条。只在这一条落定之后才做（按住 ↓ 一路划过去的那些行不预取），
+ * 进缓存的口径和 load() 一样：还在判的不要，列表和详情的结果对不上也不要。
+ *
+ * 没预取的时候，换到没看过的一条要先把代码区卸掉、转圈、再整个重新挂上 ——
+ * 2026-11 实测（生产构建、CPU 降速 6 倍）每次卡 60–100ms；走缓存的只换内容，不卡。
+ */
+function prefetch() {
+  for (const row of props.neighbors ?? []) {
+    if (!row.showLink || isJudging(row) || cache.get(row.id)?.result === row.result) continue
+    fetchDetail(row.id).then(
+      (res) => {
+        if (res.result === row.result) cache.set(row.id, res)
+      },
+      () => {},
+    )
+  }
+}
 
 // 每次加载一个序号：同一条先按「判题中」拉了一次、判完又拉一次时，晚回来的旧请求不能盖掉新的
 let loadSeq = 0
@@ -78,15 +115,17 @@ async function load() {
   const hit = cache.get(row.id)
   if (hit && hit.result === row.result) {
     detail.value = hit
+    prefetch()
     return
   }
   loading.value = true
   try {
-    const res = await getSubmission(row.id)
+    const res = await fetchDetail(row.id)
     if (seq !== loadSeq) return
     // 列表那边还在判、详情这边已经判完了（或反过来）都不缓存，等两边对上
     if (!judging.value && res.result === props.row.result) cache.set(row.id, res)
     detail.value = res
+    prefetch()
   } catch {
     if (seq === loadSeq) failed.value = true
   } finally {

apps/web/src/oj/submission/composables/rowCursor.ts

@@ -35,6 +35,13 @@ export function useRowCursor(options: {
     const index = navigable.value.findIndex((row) => row.id === selectedId.value)
     return index === -1 ? null : { index: index + 1, count: navigable.value.length }
   })
+  /** 按 ↑ ↓ 会落到的上一条、下一条（本页之内），右栏拿去预取 */
+  const neighbors = computed(() => {
+    const list = navigable.value
+    const index = list.findIndex((row) => row.id === selectedId.value)
+    if (index === -1) return []
+    return [list[index + 1], list[index - 1]].filter((row): row is Row => row !== undefined)
+  })
 
   // 翻页是异步的，先记下「落地后停在哪一头」，新一页回来再选
   let pendingJump: 'first' | 'last' | null = null
@@ -125,5 +132,5 @@ export function useRowCursor(options: {
     move(e.key === 'ArrowUp' ? -1 : 1)
   })
 
-  return { selectedId, selectedRow, position, maxPage, select, move, settleSelection, forgetJump }
+  return { selectedId, selectedRow, position, neighbors, maxPage, select, move, settleSelection, forgetJump }
 }

apps/web/src/oj/submission/detail.vue

@@ -1,8 +1,41 @@
 <script setup lang="ts">
+import { getSubmission } from 'oj/api'
+import { useMascotGuide } from 'shared/mascot/guide'
+import { useUserStore } from 'shared/store/user'
+import type { Submission } from 'utils/types'
 import SubmissionView from './components/SubmissionView.vue'
 
 /** 单独打开的一条提交，主体在 SubmissionView（课堂任务「讲错误」的弹层也用它） */
-defineProps<{ submissionID: string }>()
+const props = defineProps<{ submissionID: string }>()
+
+const router = useRouter()
+const userStore = useUserStore()
+
+/**
+ * 看板娘：学生看自己的提交时带回这道题。SubmissionView 里的数据拿不出来（弹层也用它，不挂看板娘），
+ * 这里另取一份不带「这道题交的几次」的，只给学生取
+ */
+const mine = ref<Submission | null>(null)
+watch(
+  () => [props.submissionID, userStore.isAuthed && !userStore.isTeacherOrAbove] as const,
+  async ([id, student]) => {
+    mine.value = null
+    if (!student) return
+    const res = await getSubmission(id).catch(() => null)
+    if (res && id === props.submissionID && res.userId === userStore.user?.id) mine.value = res
+  },
+  { immediate: true },
+)
+
+useMascotGuide(() => {
+  const s = mine.value
+  if (!s || userStore.isTeacherOrAbove) return null
+  // 和页面上题目那个链接同一个去处：比赛里交的回比赛里的题
+  const to = s.contestId
+    ? { name: 'contest problem', params: { contestID: String(s.contestId), problemID: s.problemDisplayId } }
+    : '/problem/' + s.problemDisplayId
+  return { situation: 'submission.detail', actions: [{ label: '回到这道题', run: () => router.push(to) }] }
+})
 </script>
 
 <template>

apps/web/src/oj/submission/list.vue

@@ -11,6 +11,7 @@ import { useBreakpoints } from 'shared/composables/breakpoints'
 import { usePagination } from 'shared/composables/pagination'
 import { useConfigStore } from 'shared/store/config'
 import { useUserStore } from 'shared/store/user'
+import { useMascotGuide } from 'shared/mascot/guide'
 import { LANGUAGE_SHOW_VALUE, SubmissionStatus } from 'utils/constants'
 import { parseTime } from 'utils/functions'
 import type { FlowchartSubmissionListItem, LANGUAGE, SubmissionListItem } from 'utils/types'
@@ -263,7 +264,7 @@ watch(
 
 // ==================== 选中与翻阅 ====================
 
-const { selectedId, selectedRow, position, maxPage, select, move, settleSelection, forgetJump } = useRowCursor({
+const { selectedId, selectedRow, position, neighbors, maxPage, select, move, settleSelection, forgetJump } = useRowCursor({
   rows,
   total,
   query,
@@ -427,6 +428,18 @@ const { lesson, lessonActive, lessonLoading, toggleLesson } = useLessonFilter({
   info: (text) => message.info(text),
 })
 
+// 看板娘：学生带去看自己的；「这节课」只有老师那一版有，老师给它
+useMascotGuide(() => {
+  if (inContest.value) return null
+  if (!teacher.value) return { situation: 'submissions', actions: mine.value ? [] : [{ label: '只看我的', run: () => (scope.value = 'mine') }] }
+  const toLesson = () => {
+    // 「我的」时这节课的按钮是藏着的，先切回全部
+    if (mine.value) scope.value = 'all'
+    toggleLesson()
+  }
+  return { situation: 'teacher.submissions', actions: lessonActive.value ? [] : [{ label: '这节课', run: toLesson }] }
+})
+
 const activeFilters = computed(
   () =>
     [query.username, query.className, query.result, query.problem].filter(Boolean).length +
@@ -858,6 +871,7 @@ function dayBreak(index: number) {
         <SubmissionPane
           v-else
           :row="selectedRow as SubmissionListItem"
+          :neighbors="neighbors as SubmissionListItem[]"
           :teacher="teacher"
           :class-name="query.className"
           :contest="inContest"
@@ -893,6 +907,7 @@ function dayBreak(index: number) {
         <SubmissionPane
           v-else
           :row="selectedRow as SubmissionListItem"
+          :neighbors="neighbors as SubmissionListItem[]"
           :teacher="teacher"
           :class-name="query.className"
           :contest="inContest"

apps/web/src/oj/task/components/LessonForm.vue

@@ -92,6 +92,9 @@ function openPicker() {
   pickerInitial.value = inputIds().map((id) => ({ id, title: titles.get(id.toLowerCase()) }))
   picking.value = true
 }
+
+// 看板娘气泡里的「选题」：课堂任务页没布置时替老师打开选题弹框
+defineExpose({ openPicker })
 function pickerConfirm(ids: string[]) {
   lessonInput.value = ids.join(' ')
   saveLesson()

apps/web/src/oj/task/index.vue

@@ -10,6 +10,8 @@ import { useLeaveStudents } from 'shared/composables/leaveStudents'
 import { useTeacherHelp } from 'shared/composables/teacherHelp'
 import { useCollabStore } from 'shared/store/collab'
 import { useConfigStore } from 'shared/store/config'
+import { requestSpeech } from 'shared/mascot/behavior'
+import { useMascotGuide, type MascotAction, type MascotGuide } from 'shared/mascot/guide'
 import { errorMessage } from 'utils/api'
 import { LANGUAGE_SHOW_VALUE } from 'utils/constants'
 import { parseTime } from 'utils/functions'
@@ -511,6 +513,161 @@ function submissionsHref(
   }).href
 }
 
+/**
+ * 看板娘：布置了就带去这节课的提交，筛法同提交列表「这节课」（班、这几道题、今天）。
+ * 语言和格子一致：画流程图的课看流程图，选了语言的只看它 —— 夹着 SQL 题的不筛语言，免得把 SQL 交的藏掉。
+ * 还没布置时填题号的框就是这页最大的东西，不给按钮
+ */
+const startForm = useTemplateRef<{ openPicker: () => void }>('startForm')
+// ---------- 看板娘：点她时挑全班这一刻最要紧的一件说；卡住的多起来、全班做完时她自己开口 ----------
+
+/** 同一种错有这么多人才算「扎堆」 */
+const PILE_MIN = 3
+/** 布置这么久了，人在线却一道没交，才算「没动」 */
+const IDLE_AFTER_MS = 10 * 60_000
+/** 一道题卡住的人涨到这么多，她主动说一声 */
+const STUCK_RISE = 3
+
+/** 人最多的那一堆错（灰底那几堆不算：不是今天的错，没得讲） */
+function biggestPile() {
+  let best: { index: number; kind: ErrorKind; people: WrongPerson[] } | null = null
+  const count = board.value?.problems.length ?? 0
+  for (let index = 0; index < count; index++) {
+    const groups = new Map<string, WrongPerson[]>()
+    for (const person of wrongOf(index)) {
+      if (QUIET_KINDS.has(person.kind.key)) continue
+      groups.set(person.kind.key, [...(groups.get(person.kind.key) ?? []), person])
+    }
+    for (const people of groups.values()) {
+      if (!best || people.length > best.people.length) best = { index, kind: people[0]!.kind, people }
+    }
+  }
+  return best && best.people.length >= PILE_MIN ? best : null
+}
+
+/** 卡住的人（cells.ts 的 isStuck），交得多的在前 */
+function stuckPeople() {
+  return present.value
+    .flatMap((student) => student.cells.map((cell, index) => ({ student, cell, index })))
+    .filter(({ cell, index }) => isStuck(cell, modeAt(index)))
+    .sort((a, b) => b.cell.attempts - a.cell.attempts)
+}
+
+/** 在线、今天一道没交、也不是早就全做完了的人 */
+function idlePeople() {
+  const assignedAt = board.value?.assignedAt
+  if (!assignedAt || Date.now() - Date.parse(assignedAt) < IDLE_AFTER_MS) return []
+  return present.value.filter(
+    (student) => student.online && student.cells.every((cell) => cell.attempts === 0) && student.cells.some((cell) => cell.status !== 'accepted'),
+  )
+}
+
+const allDone = () => present.value.length > 0 && present.value.every((student) => student.cells.every((cell) => cell.status === 'accepted'))
+
+/** 点名字：能讲的打开讲错误的弹层，不能讲的展开那道题的错法 */
+function lookAt(index: number, student: TaskBoardStudent): MascotAction {
+  const cell = student.cells[index]!
+  const problem = board.value!.problems[index]!
+  return {
+    label: `看 ${displayName(student.username)} 的`,
+    run: () => (explainable(cell, index) ? openExplain(index, student.userId) : (selectedId.value = problem.problemId)),
+  }
+}
+
+useMascotGuide((): MascotGuide | null => {
+  const b = board.value
+  if (!b?.className) return null
+  if (needLesson.value)
+    return { situation: 'teacher.task.unassigned', actions: startForm.value ? [{ label: '选题', run: () => startForm.value?.openPicker() }] : [] }
+  const language = b.mode === 'flowchart' ? 'Flowchart' : b.problems.some((problem) => problem.isSql) ? null : b.language
+  const query = {
+    className: b.className,
+    problem: b.problems.map((problem) => problem.problemDisplayId).join(','),
+    today: '1',
+    ...(language ? { language } : {}),
+  }
+  // 新标签打开，和点格子一样：任务页一般开着不关
+  const submissions: MascotAction = { label: '这节课的提交', run: () => window.open(router.resolve({ name: 'submissions', query }).href, '_blank') }
+
+  if (allDone())
+    return { situation: 'teacher.task.allDone', actions: [{ label: b.source === 'teacher' ? '改题' : '布置', run: () => (editing.value = 'edit') }] }
+
+  const pile = biggestPile()
+  if (pile) {
+    const problem = b.problems[pile.index]!
+    const first = pile.people.find((person) => person.explain)
+    const actions: MascotAction[] = [{ label: '看这堆', run: () => (selectedId.value = problem.problemId) }]
+    if (first) actions.push({ label: '讲第一个', run: () => openExplain(pile.index, first.student.userId) })
+    return {
+      situation: 'teacher.task.errorPile',
+      n: pile.people.length,
+      vars: { pid: problem.problemDisplayId, kind: pile.kind.label },
+      actions: [...actions, submissions],
+    }
+  }
+
+  const stuck = stuckPeople()
+  if (stuck.length) {
+    const top = stuck[0]!
+    return {
+      situation: 'teacher.task.stuck',
+      n: new Set(stuck.map((it) => it.student.userId)).size,
+      vars: { name: displayName(top.student.username), k: top.cell.attempts, pid: b.problems[top.index]!.problemDisplayId },
+      actions: [lookAt(top.index, top.student), submissions],
+    }
+  }
+
+  const idle = idlePeople()
+  if (idle.length) {
+    const name = displayName(idle[0]!.username)
+    return idle.length === 1 ? { situation: 'teacher.task.idleOne', vars: { name } } : { situation: 'teacher.task.idle', n: idle.length, vars: { name } }
+  }
+
+  const challenging = present.value.filter((student) => student.cells.some((cell) => cell.challenge === 'doing')).length
+  if (challenging) return { situation: 'teacher.task.challenging', n: challenging, actions: [submissions] }
+
+  return { situation: 'teacher.task.assigned', actions: [submissions] }
+})
+
+/**
+ * 主动开口：每 15 秒刷新一次，和上一次比 —— 某道题卡住的人从不到 3 个涨到 3 个、全班刚做完。
+ * 刚打开页面（或换了班、换了一节）的那一次只记数不说，不然一刷新就把已经知道的事再说一遍
+ */
+let seen: { key: string; stuck: Map<number, number>; done: boolean } | null = null
+watch(board, (b) => {
+  if (!b?.className || needLesson.value) return
+  const key = `${b.className}|${b.day}|${b.lessonId ?? ''}|${b.problems.map((problem) => problem.problemId).join(',')}`
+  const stuck = new Map<number, number>()
+  for (const { index } of stuckPeople()) {
+    const id = b.problems[index]!.problemId
+    stuck.set(id, (stuck.get(id) ?? 0) + 1)
+  }
+  const done = allDone()
+  const before = seen?.key === key ? seen : null
+  seen = { key, stuck, done }
+  if (!before) return
+  if (done && !before.done) {
+    requestSpeech({
+      key: `done:${key}`,
+      situation: 'teacher.task.allDone',
+      actions: [{ label: b.source === 'teacher' ? '改题' : '布置', run: () => (editing.value = 'edit') }],
+    })
+    return
+  }
+  for (const [id, n] of stuck) {
+    if (n < STUCK_RISE || (before.stuck.get(id) ?? 0) >= STUCK_RISE) continue
+    const problem = b.problems.find((it) => it.problemId === id)!
+    requestSpeech({
+      key: `stuck:${key}:${id}`,
+      situation: 'teacher.task.stuckRise',
+      n,
+      vars: { pid: problem.problemDisplayId },
+      actions: [{ label: '看这道', run: () => (selectedId.value = id) }],
+    })
+    return
+  }
+})
+
 function lastText(student: TaskBoardStudent) {
   if (student.lastSubmitAt) return parseTime(student.lastSubmitAt, 'HH:mm')
   if (oftenIdle(student)) {
@@ -578,7 +735,16 @@ function lastText(student: TaskBoardStudent) {
       <!-- 刚上课还没有题：填题号的框是这页最大的东西 -->
       <section v-if="needLesson" class="start">
         <div class="start-title">这节课做哪几道题？</div>
-        <LessonForm v-if="className" :board="board" :class-name="className" :lesson-id="null" variant="start" class="start-row" @saved="lessonSaved" />
+        <LessonForm
+          v-if="className"
+          ref="startForm"
+          :board="board"
+          :class-name="className"
+          :lesson-id="null"
+          variant="start"
+          class="start-row"
+          @saved="lessonSaved"
+        />
         <div v-if="staleLesson" class="earlier">
           <span>上一节 {{ board.assignedAt ? parseTime(board.assignedAt, 'HH:mm') : '' }} {{ board.assignedBy }} 布置</span>
           <span v-for="problem in board.problems" :key="problem.problemId" class="chip">{{ problem.problemDisplayId }}</span>

apps/web/src/oj/user/index.vue

@@ -4,6 +4,7 @@ import { getProfileOverview } from 'oj/api'
 import { getProfile } from 'shared/api'
 import { useBreakpoints } from 'shared/composables/breakpoints'
 import { useUserStore } from 'shared/store/user'
+import { goAction, useMascotGuide } from 'shared/mascot/guide'
 import type { Profile } from 'utils/types'
 import AchievementCard from './components/AchievementCard.vue'
 import KnowledgeMap from './components/KnowledgeMap.vue'
@@ -17,6 +18,7 @@ import VersusCard from './components/VersusCard.vue'
  * /profiles/:username/overview），这里只管摆。原来的「我的设置」并进了名片。
  */
 const route = useRoute()
+const router = useRouter()
 const userStore = useUserStore()
 const { isDesktop } = useBreakpoints()
 
@@ -47,6 +49,12 @@ async function load() {
 }
 
 watch(username, load, { immediate: true })
+
+// 看板娘：只在看自己的主页时说话
+useMascotGuide(() => {
+  if (!isSelf.value || !profile.value || userStore.isTeacherOrAbove) return null
+  return { situation: 'profile', actions: [goAction(router, '我的成就', '/achievement'), goAction(router, '我的提交', '/submission?myself=1')] }
+})
 </script>
 
 <template>

apps/web/src/shared/assets/mascot/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Sutera-Diffusus
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.