fix(题目页): 统计页签的老师版回到讲这道题本身，各班只列一张表，不选班、不列人名

按人看谁没做对是提交页「数据统计」的活；表里点一个班就去那边看。

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

apps/api/src/routes/problem-stats.ts

@@ -1,5 +1,5 @@
-import { type ProblemClassDetail, type ProblemStats } from "@oj2/contract"
-import { and, eq, isNotNull, sql } from "drizzle-orm"
+import { type ProblemStats } from "@oj2/contract"
+import { and, count, eq, inArray, isNotNull, sql } from "drizzle-orm"
 import { Hono } from "hono"
 
 import { optionalAuth, type AppEnv } from "../auth/middleware"
@@ -9,7 +9,7 @@ import { JudgeStatus, UNJUDGED_RESULTS, type JudgeStatusValue } from "../judge/s
 import { canAccessContest, contestDetailsAllowed, findAccessibleContest } from "../services/contest"
 import { accepted } from "../services/learning-stats"
 import { localTime } from "../time"
-import { isAdminRole, isTeacherOrAbove, queryInteger, stripClassPrefix } from "./helpers"
+import { isAdminRole, isTeacherOrAbove, queryInteger } from "./helpers"
 
 export const problemStatsRoutes = new Hono<AppEnv>()
 
@@ -29,7 +29,6 @@ const EMPTY: ProblemStats = {
   me: null,
   myClass: null,
   classes: null,
-  classDetail: null,
 }
 
 // type 而不是 interface：db.execute 的泛型约束是 Record<string, unknown>，interface 不带索引签名
@@ -41,14 +40,13 @@ type UserRow = {
   /** 做对之前（含做对那次）交了几次；没做对就是全部次数 */
   tries: number
   solved: boolean
-  last_result: JudgeStatusValue
-  last_time: string
 }
 
 /**
- * 题目页「统计」页签。id 是内部题号（problem.id）：比赛题的展示题号是 1、2、3，
- * 拿 displayId 查会撞上同号的公开题（原来的「历年 AC 率」就是这么查错的）。
- * `className` 只有老师用：选中哪个班看明细，不填就是最近做过这题的那个班。
+ * 题目页「统计」页签：讲的是**这道题**（难不难、几次做对、常错在哪），老师多一张各班的表。
+ * 看谁没做对是提交页「数据统计」的活，这里只到班级这一层。
+ * id 是内部题号（problem.id）：比赛题的展示题号是 1、2、3，拿 displayId 查会撞上
+ * 同号的公开题（原来的「历年 AC 率」就是这么查错的）。
  */
 problemStatsRoutes.get("/problems/:id/stats", optionalAuth, async (c) => {
   const user = c.get("user")
@@ -93,9 +91,7 @@ problemStatsRoutes.get("/problems/:id/stats", optionalAuth, async (c) => {
       select s.user_id, u.username, u.class_name,
         count(*)::int as attempts,
         count(*) filter (where s.first_ac is null or s.create_time <= s.first_ac)::int as tries,
-        (min(s.first_ac) is not null) as solved,
-        (array_agg(s.result order by s.create_time desc))[1] as last_result,
-        max(s.create_time) as last_time
+        (min(s.first_ac) is not null) as solved
       from (
         select user_id, result, create_time,
           min(create_time) filter (where result in (${acceptedList}))
@@ -157,7 +153,6 @@ problemStatsRoutes.get("/problems/:id/stats", optionalAuth, async (c) => {
   const classmates = myClassName ? users.filter((row) => row.class_name === myClassName) : []
 
   let classes: ProblemStats["classes"] = null
-  let classDetail: ProblemClassDetail | null = null
   if (!inContest && isTeacherOrAbove(user)) {
     const byClass = new Map<string, UserRow[]>()
     for (const row of users) {
@@ -172,27 +167,41 @@ problemStatsRoutes.get("/problems/:id/stats", optionalAuth, async (c) => {
         peak.set(row.className!, { day: row.day, users: row.users })
       }
     }
-    const lessonClasses = [...byClass]
-      .filter(([className]) => (peak.get(className)?.users ?? 0) >= CLASS_MIN_TRIED)
-      .map(([className, rows]) => ({
+    const lessonClasses = [...byClass].filter(
+      ([className]) => (peak.get(className)?.users ?? 0) >= CLASS_MIN_TRIED,
+    )
+    // 花名册只数学生：老师、助教也可能挂着班级
+    const sizes = lessonClasses.length
+      ? await db
+          .select({ className: schema.user.className, value: count() })
+          .from(schema.user)
+          .where(
+            and(
+              inArray(
+                schema.user.className,
+                lessonClasses.map(([className]) => className),
+              ),
+              eq(schema.user.adminType, "Regular User"),
+              eq(schema.user.isDisabled, false),
+            ),
+          )
+          .groupBy(schema.user.className)
+      : []
+    classes = lessonClasses
+      .map(([className, rows]) => {
+        const top = failureRows
+          .filter((row) => row.class_name === className)
+          .sort((a, b) => b.n - a.n)[0]
+        return {
           className,
+          day: peak.get(className)!.day,
           tried: rows.length,
           solved: rows.filter((row) => row.solved).length,
-        day: peak.get(className)!.day,
-      }))
-      .sort((a, b) => b.day.localeCompare(a.day))
-    classes = lessonClasses
-    // 地址里指定的班不在列表里（零星几个人做过）也照样给明细
-    const wanted = c.req.query("className")?.trim()
-    const selected = wanted && byClass.has(wanted) ? wanted : lessonClasses[0]?.className
-    if (selected) {
-      classDetail = await buildClassDetail(
-        selected,
-        peak.get(selected)!.day,
-        byClass.get(selected)!,
-        failureRows,
-      )
+          classSize: sizes.find((row) => row.className === className)?.value ?? 0,
+          topFailure: top ? { result: top.result, count: top.n } : null,
         }
+      })
+      .sort((a, b) => b.day.localeCompare(a.day))
   }
 
   return success(c, {
@@ -211,49 +220,5 @@ problemStatsRoutes.get("/problems/:id/stats", optionalAuth, async (c) => {
         }
       : null,
     classes,
-    classDetail,
   } satisfies ProblemStats)
 })
-
-async function buildClassDetail(
-  className: string,
-  day: string,
-  rows: UserRow[],
-  failureRows: { class_name: string | null; result: JudgeStatusValue; n: number }[],
-): Promise<ProblemClassDetail> {
-  // 花名册只数学生：老师、助教也可能挂着班级
-  const roster = await db
-    .select({ id: schema.user.id, username: schema.user.username })
-    .from(schema.user)
-    .where(
-      and(
-        eq(schema.user.className, className),
-        eq(schema.user.adminType, "Regular User"),
-        eq(schema.user.isDisabled, false),
-      ),
-    )
-  const triedIds = new Set(rows.map((row) => row.user_id))
-  const name = (username: string | null) => stripClassPrefix(username ?? "", className)
-  return {
-    className,
-    roster: roster.length,
-    day,
-    failures: failureRows
-      .filter((row) => row.class_name === className)
-      .map((row) => ({ result: row.result, count: row.n }))
-      .sort((a, b) => b.count - a.count),
-    unsolved: rows
-      .filter((row) => !row.solved)
-      .sort((a, b) => b.attempts - a.attempts)
-      .map((row) => ({
-        realName: name(row.username),
-        attempts: row.attempts,
-        lastResult: row.last_result,
-      })),
-    solved: rows
-      .filter((row) => row.solved)
-      .sort((a, b) => a.last_time.localeCompare(b.last_time))
-      .map((row) => name(row.username)),
-    untouched: roster.filter((row) => !triedIds.has(row.id)).map((row) => name(row.username)),
-  }
-}

apps/web/src/oj/api.ts

@@ -115,14 +115,9 @@ export async function getProblem(problemID: string, contestID: string) {
   return problem
 }
 
-/**
- * 题目页「统计」页签。problemID 是内部题号（problem.id），比赛题也能查。
- * className 只有老师用：看哪个班的明细，不填就是最近做过这题的班
- */
-export function getProblemStats(problemID: number, className?: string) {
-  return api.get<ProblemStats>(`problems/${problemID}/stats`, {
-    params: className ? { className } : {},
-  })
+/** 题目页「统计」页签。problemID 是内部题号（problem.id），比赛题也能查 */
+export function getProblemStats(problemID: number) {
+  return api.get<ProblemStats>(`problems/${problemID}/stats`)
 }
 
 export async function getSubmission(id: string): Promise<Submission> {

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

@@ -13,11 +13,10 @@ import type { ProblemStats, SUBMISSION_RESULT } from "utils/types"
 import { useProblemPageContext } from "../composables/problemPageContext"
 
 /**
- * 「统计」页签（设计稿「题目页统计重设计」：学生 A、老师 B）。
- *
- * 学生看的是「这题难不难 → 大家几次做对 → 常错在哪 → 你们班」，全部按人算；自己卡住了
- * 再多一张卡。老师看的是一个班：谁做对了、谁交了没对（卡在哪）、谁还没交 —— 原来工具栏上
- * 的「课堂统计」并进了这里。原来的描述表、击败用户、饼图、历年 AC 率都去掉了。
+ * 「统计」页签（设计稿「题目页统计重设计」学生 A）。讲的是**这道题**：难不难 → 大家几次
+ * 做对 → 常错在哪，全部按人算。学生多一行「你们班」、自己卡住了再多一张卡；老师多一张
+ * 各班的表（只到班级这一层，不选班、不列人 —— 按人看是提交页「数据统计」的活）。
+ * 原来的描述表、击败用户、饼图、历年 AC 率都去掉了。
  */
 const emit = defineEmits<{ openSubmissions: [] }>()
 
@@ -31,15 +30,12 @@ const tone = useTone()
 
 const stats = ref<ProblemStats | null>(null)
 const failed = ref(false)
-const className = ref<string | null>(null)
 
 async function load() {
   if (!problem.value) return
   failed.value = false
   try {
-    const res = await getProblemStats(problem.value.id, className.value ?? undefined)
-    stats.value = res
-    if (res.classDetail) className.value = res.classDetail.className
+    stats.value = await getProblemStats(problem.value.id)
   } catch {
     failed.value = true
   }
@@ -47,13 +43,6 @@ async function load() {
 
 onMounted(load)
 
-function changeClass(value: string) {
-  className.value = value
-  load()
-}
-
-const teacherView = computed(() => stats.value?.classes != null)
-
 function resultName(result: number) {
   return JUDGE_STATUS[result as SUBMISSION_RESULT]?.name ?? "其他"
 }
@@ -139,53 +128,13 @@ const stuck = computed(() => {
   return me && !me.solved && me.attempts >= 3 ? me.attempts : 0
 })
 
-// ---------- 老师 ----------
+// ---------- 老师：各班的表 ----------
 
-const detail = computed(() => stats.value?.classDetail ?? null)
-
-const classOptions = computed(() =>
-  (stats.value?.classes ?? []).map((item) => ({
-    label: `${classLabel(item.className)} · ${item.solved}/${item.tried}`,
-    value: item.className,
-  })),
-)
-
-const classSegments = computed(() => {
-  const d = detail.value
-  if (!d) return []
-  return [
-    { key: "solved", label: "做对", value: d.solved.length, color: theme.value.successColor },
-    { key: "unsolved", label: "交了没对", value: d.unsolved.length, color: theme.value.errorColor },
-    { key: "untouched", label: "没交", value: d.untouched.length, color: theme.value.dividerColor },
-  ]
-})
-
-const classFailedTotal = computed(() =>
-  (detail.value?.failures ?? []).reduce((sum, item) => sum + item.count, 0),
-)
-
-/** 这个班错得最多的和全站不一样时点出来：老师该看的就是这种差别 */
-const siteDiffers = computed(() => {
-  const site = stats.value?.failures[0]
-  const mine = detail.value?.failures[0]
-  return site && mine && site.result !== mine.result ? resultName(site.result) : ""
-})
-
-const showSolved = ref(false)
-const showUntouched = ref(false)
-
-function openStatistics() {
+/** 点一个班、或者表下面那行：去提交页的「数据统计」按人看（新标签，题目页不动） */
+function openStatistics(className?: string) {
   const href = router.resolve({
     name: "statistics",
-    query: { problem: problem.value!._id, className: className.value ?? "", period: "all" },
-  }).href
-  window.open(href, "_blank")
-}
-
-function openClassSubmissions() {
-  const href = router.resolve({
-    name: "submissions",
-    query: { problem: problem.value!._id, className: className.value ?? "" },
+    query: { problem: problem.value!._id, period: "all", ...(className ? { className } : {}) },
   }).href
   window.open(href, "_blank")
 }
@@ -251,105 +200,7 @@ function segmentWidth(value: number, total: number) {
       </router-link>
     </div>
 
-    <!-- ==================== 老师：看一个班 ==================== -->
-    <template v-else-if="teacherView">
-      <div v-if="!detail" class="empty">
-        <span class="empty-icon"><Icon icon="ph:users" :width="18" /></span>
-        <b>还没有班级做过这道题</b>
-        <n-text depth="3">布置到这节课之后，这里会按班显示谁做对了、谁还没交。</n-text>
-        <n-button type="primary" secondary @click="router.push('/classroom')">
-          去课堂看板布置 →
-        </n-button>
-      </div>
-      <template v-else>
-        <div class="class-head">
-          <n-select
-            :value="className"
-            :options="classOptions"
-            size="small"
-            class="class-select"
-            :consistent-menu-width="false"
-            @update:value="changeClass"
-          />
-          <n-text depth="3" class="small">{{ dayText(detail.day) }}做的</n-text>
-          <span class="spacer"></span>
-          <a href="#" class="link small" @click.prevent="openStatistics">
-            在数据统计里看 <Icon icon="ph:arrow-square-out" :width="13" />
-          </a>
-        </div>
-
-        <div class="bar">
-          <span
-            v-for="seg in classSegments"
-            :key="seg.key"
-            :style="{ width: segmentWidth(seg.value, detail.roster), background: seg.color }"
-          ></span>
-        </div>
-        <div class="legend">
-          <span v-for="seg in classSegments" :key="seg.key">
-            <i :style="{ background: seg.color }"></i>{{ seg.label }} <b>{{ seg.value }}</b>
-          </span>
-        </div>
-
-        <div v-if="classFailedTotal" class="line">
-          <b>没通过的 {{ classFailedTotal }} 次：</b>
-          <n-text depth="2">
-            {{
-              detail.failures
-                .slice(0, 3)
-                .map((item) => `${resultName(item.result)} ${item.count}`)
-                .join(" · ")
-            }}
-          </n-text>
-          <span class="spacer"></span>
-          <n-text v-if="siteDiffers" depth="3" class="small">全站是{{ siteDiffers }}最多</n-text>
-        </div>
-
-        <template v-if="detail.unsolved.length">
-          <div class="line">
-            <b>交了没对（{{ detail.unsolved.length }} 人）</b>
-            <span class="spacer"></span>
-            <n-text depth="3" class="small">次数多的在前</n-text>
-          </div>
-          <div class="people">
-            <div v-for="(item, index) in detail.unsolved" :key="index" class="person">
-              <b>{{ item.realName }}</b>
-              <n-text depth="3">{{ item.attempts }} 次</n-text>
-              <span :style="{ color: barColor(item.lastResult) }">
-                {{ resultName(item.lastResult) }}
-              </span>
-            </div>
-          </div>
-        </template>
-
-        <div v-if="detail.solved.length" class="fold">
-          <div class="fold-head" @click="showSolved = !showSolved">
-            <b>做对 {{ detail.solved.length }}</b>
-            <span class="fold-names">
-              {{ showSolved ? "" : detail.solved.join("、") }}
-            </span>
-            <span class="link small">{{ showSolved ? "收起" : "展开" }}</span>
-          </div>
-          <div v-if="showSolved" class="fold-body">{{ detail.solved.join("、") }}</div>
-        </div>
-        <div v-if="detail.untouched.length" class="fold">
-          <div class="fold-head" @click="showUntouched = !showUntouched">
-            <b>没交 {{ detail.untouched.length }}</b>
-            <span class="fold-names">{{ showUntouched ? "" : "展开看名单" }}</span>
-            <span class="link small">{{ showUntouched ? "收起" : "展开" }}</span>
-          </div>
-          <div v-if="showUntouched" class="fold-body">{{ detail.untouched.join("、") }}</div>
-        </div>
-
-        <div class="foot">
-          <a href="#" class="link small" @click.prevent="openClassSubmissions">
-            看这个班这道题的提交 ›
-          </a>
-        </div>
-      </template>
-    </template>
-
-    <!-- ==================== 学生 ==================== -->
+    <!-- ==================== 这道题（学生、老师都看） ==================== -->
     <div v-else-if="!stats.tried" class="empty">
       <span class="empty-icon"><Icon icon="ph:sparkle" :width="18" /></span>
       <b>还没有人交过这道题</b>
@@ -419,6 +270,66 @@ function segmentWidth(value: number, total: number) {
         </div>
       </div>
 
+      <!-- 老师：各班一行，只到班级这一层；按人看去数据统计 -->
+      <div v-if="stats.classes" class="section">
+        <div class="line">
+          <b>各班做得怎样</b>
+          <span class="spacer"></span>
+          <n-text depth="3" class="small">同一天 5 人以上交过才算这个班做过</n-text>
+        </div>
+        <table v-if="stats.classes.length" class="classes">
+          <thead>
+            <tr>
+              <th>班级</th>
+              <th>哪天做的</th>
+              <th>做对 / 交过</th>
+              <th>没交</th>
+              <th>错得最多</th>
+            </tr>
+          </thead>
+          <tbody>
+            <tr
+              v-for="item in stats.classes"
+              :key="item.className"
+              title="去数据统计看这个班的每个人"
+              @click="openStatistics(item.className)"
+            >
+              <td>
+                <b>{{ classLabel(item.className) }}</b>
+              </td>
+              <td>
+                <n-text depth="2">{{ dayText(item.day) }}</n-text>
+              </td>
+              <td>
+                <span
+                  :style="{
+                    color: item.solved < item.tried ? tone('error').color : undefined,
+                    fontWeight: 600,
+                  }"
+                  >{{ item.solved }}</span
+                >
+                / {{ item.tried }}
+              </td>
+              <td>
+                <n-text depth="2">{{ Math.max(0, item.classSize - item.tried) }}</n-text>
+              </td>
+              <td>
+                <span v-if="item.topFailure" :style="{ color: barColor(item.topFailure.result) }">
+                  {{ resultName(item.topFailure.result) }} {{ item.topFailure.count }}
+                </span>
+                <n-text v-else depth="3">—</n-text>
+              </td>
+            </tr>
+          </tbody>
+        </table>
+        <n-text v-else depth="3" class="small">还没有哪个班一起做过这道题</n-text>
+        <div class="foot">
+          <a href="#" class="link small" @click.prevent="openStatistics()">
+            按人看谁没做对，去数据统计 <Icon icon="ph:arrow-square-out" :width="13" />
+          </a>
+        </div>
+      </div>
+
       <div v-if="stats.myClass?.tried" class="class-box">
         <div class="line">
           <b>你们班 · {{ classLabel(stats.myClass.className) }}</b>
@@ -652,65 +563,36 @@ function segmentWidth(value: number, total: number) {
   gap: 6px;
 }
 
-.class-head {
-  display: flex;
-  align-items: center;
-  gap: 10px;
-}
-
-.class-select {
-  width: 190px;
-}
-
-.people {
-  display: grid;
-  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
-  gap: 6px;
-}
-
-.person {
-  display: flex;
-  align-items: center;
-  gap: 6px;
-  padding: 5px 10px;
-  border-radius: 6px;
-  border: 1px solid v-bind("theme.dividerColor");
-  font-size: 13px;
-  white-space: nowrap;
-  overflow: hidden;
-}
-
-.fold {
-  border-radius: 6px;
-  background: v-bind("theme.actionColor");
-  font-size: 13px;
-}
-
-.fold-head {
-  display: flex;
-  align-items: center;
-  gap: 8px;
-  padding: 8px 12px;
-  cursor: pointer;
-}
-
-.fold-names {
-  flex: 1;
-  min-width: 0;
-  overflow: hidden;
-  text-overflow: ellipsis;
-  white-space: nowrap;
-  color: v-bind("theme.textColor2");
-}
-
-.fold-body {
-  padding: 0 12px 10px;
-  line-height: 1.8;
-  color: v-bind("theme.textColor2");
-}
-
 .foot {
   display: flex;
   justify-content: flex-end;
 }
+
+.classes {
+  width: 100%;
+  border-collapse: collapse;
+  font-size: 13px;
+}
+
+.classes th {
+  text-align: left;
+  font-weight: normal;
+  color: v-bind("theme.textColor3");
+  padding: 4px 8px 6px 0;
+  border-bottom: 1px solid v-bind("theme.dividerColor");
+}
+
+.classes td {
+  padding: 8px 8px 8px 0;
+  border-bottom: 1px solid v-bind("theme.dividerColor");
+  white-space: nowrap;
+}
+
+.classes tbody tr {
+  cursor: pointer;
+}
+
+.classes tbody tr:hover {
+  background: v-bind("theme.hoverColor");
+}
 </style>

apps/web/src/utils/types.ts

@@ -81,7 +81,7 @@ export type ProblemStatus = "passed" | "failed" | "not_test"
  * shared/api.ts 原来还得用 `Tag & { problemCount: number }` 把它补回来。
  */
 export type { Tag, TagCategory } from "@oj2/contract"
-export type { ProblemStats, ProblemClassDetail } from "@oj2/contract"
+export type { ProblemStats } from "@oj2/contract"
 export type { TodaySubmissionStatistics } from "@oj2/contract"
 
 export type {

packages/contract/src/problem.ts

@@ -449,23 +449,6 @@ export const problemAuthorSchema = z.object({
 
 const failureCountSchema = z.object({ result: judgeStatusSchema, count: z.number().int() })
 
-/** 老师选中一个班时的明细：谁做对了、谁交了没对（卡在哪）、谁还没交 */
-export const problemClassDetailSchema = z.object({
-  className: z.string(),
-  /** 班里的学生数（学生角色、没禁用） */
-  roster: z.number().int(),
-  /** 这个班一起做这道题的那天（东八区 YYYY-MM-DD，交的人最多的那天）—— 「2025年12月5日做的」 */
-  day: z.string(),
-  failures: z.array(failureCountSchema),
-  /** 交了没对，次数多的在前。名字是剥掉 ks<班级号> 前缀的那一段 */
-  unsolved: z.array(
-    z.object({ realName: z.string(), attempts: z.number().int(), lastResult: judgeStatusSchema }),
-  ),
-  solved: z.array(z.string()),
-  /** 班里还没交过的 */
-  untouched: z.array(z.string()),
-})
-
 /**
  * 题目页「统计」页签。全部**按人**算，不按提交条数 —— 原来的「通过数」是 AC 条数
  * （3092 是 219 条、202 个人），「通过率」是按提交算的，学生看了不知道这题难不难。
@@ -491,20 +474,23 @@ export const problemStatsSchema = z.object({
     .nullable(),
   /**
    * 老师：一起做过这题的班（同一天至少 5 个人交过 —— 零星几个人自己刷到、补做的不算），
-   * 按那天倒序。原来工具栏上的「课堂统计」并进了这里。学生、比赛里为 null
+   * 按那天倒序。只到班级这一层：看谁没做对是提交页「数据统计」的活。学生、比赛里为 null
    */
   classes: z
     .array(
       z.object({
         className: z.string(),
+        /** 这个班一起做这道题的那天（东八区 YYYY-MM-DD，交的人最多的那天） */
+        day: z.string(),
         tried: z.number().int(),
         solved: z.number().int(),
-        day: z.string(),
+        /** 班里的学生数（学生角色、没禁用），没交的 = classSize - tried */
+        classSize: z.number().int(),
+        /** 这个班错得最多的那种，一次没错过为 null */
+        topFailure: failureCountSchema.nullable(),
       }),
     )
     .nullable(),
-  /** 老师选中的那个班（默认 classes 第一个）的明细 */
-  classDetail: problemClassDetailSchema.nullable(),
 })
 
 export type AstRuleEngine = z.infer<typeof astRuleEngineSchema>
@@ -523,4 +509,3 @@ export type SqlDisplay = z.infer<typeof sqlDisplaySchema>
 export type SqlDisplayTable = z.infer<typeof sqlDisplayTableSchema>
 export type SqlDisplayColumn = z.infer<typeof sqlDisplayColumnSchema>
 export type ProblemStats = z.infer<typeof problemStatsSchema>
-export type ProblemClassDetail = z.infer<typeof problemClassDetailSchema>