feat(出题): 参考流程图改用画布画，「让学生自己画」不再要参考图

- 学生画的图现在按例子和测试数据评（拼成程序跑），参考图用不上了：「让学生自己画」
  只剩一句说明，保存前改成检查有没有例子；「给学生的提示」那一栏去掉（学生从来看不到，
  16 道题也都没填）
- 「给学生看一张参考流程图」改用学生画图的同一个编辑器，存结构树（problem.flowchart_data，
  原来是死列），Mermaid 由后端照它生成，题面里的图和学生交的图同一套形状
- 「AI 照 Python 答案画一张」改成出结构树，直接摆在画布上接着改；for 循环画成
  计数变量 + 当型循环
- 老题手写的 Mermaid 照旧给代码框，旁边「改用画布画」

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

apps/api/src/routes/admin/problem.ts

@@ -1,4 +1,6 @@
 import {
+  flowToMermaid,
+  parseFlowDoc,
   addContestProblemRequestSchema,
   reorderContestProblemsRequestSchema,
   astCheckRequestSchema,
@@ -206,6 +208,7 @@ async function serialize(row: ProblemRow) {
     allowFlowchart: row.allowFlowchart,
     showFlowchart: row.showFlowchart,
     mermaidCode: row.mermaidCode,
+    flowchartData: asRecord(row.flowchartData),
     flowchartHint: row.flowchartHint,
     astRules: row.astRules,
     answers: Array.isArray(row.answers) ? row.answers : [],
@@ -276,6 +279,17 @@ async function generateSqlDisplay(
   return { display: outcome.value }
 }
 
+/**
+ * 参考流程图：画布画的（结构树）以它为准，Mermaid 照它生成 —— 题面里给学生看的、评分退回
+ * 老办法时拿来比的都是这份，和学生交的图同一套形状。只有手写 Mermaid 的老题原样存
+ */
+function referenceFlowchart(raw: Record<string, unknown> | null, mermaidCode: string | null) {
+  const doc = parseFlowDoc(raw)
+  return doc && doc.steps.length
+    ? { flowchartData: doc, mermaidCode: flowToMermaid(doc) }
+    : { flowchartData: {}, mermaidCode }
+}
+
 function problemValues(data: ReturnType<typeof createProblemRequestSchema.parse>, isSql: boolean) {
   return {
     displayId: data._id,
@@ -296,7 +310,7 @@ function problemValues(data: ReturnType<typeof createProblemRequestSchema.parse>
     source: data.source,
     allowFlowchart: data.allowFlowchart,
     showFlowchart: data.showFlowchart,
-    mermaidCode: data.mermaidCode,
+    ...referenceFlowchart(data.flowchartData, data.mermaidCode),
     flowchartHint: data.flowchartHint,
     astRules: pickAstRules(data.astRules, data.languages),
     answers: data.answers,

apps/api/src/routes/admin/tag.ts

@@ -1,4 +1,5 @@
 import {
+  parseFlowDoc,
   batchProblemTagRequestSchema,
   generateFlowchartRequestSchema,
   renameTagRequestSchema,
@@ -16,7 +17,7 @@ import type { AuthUser } from "../../auth/session"
 import { db, schema } from "../../db"
 import { failure, parseBody, success } from "../../http"
 import { completeChat } from "../../services/ai"
-import { queryInteger } from "../helpers"
+import { asRecord, queryInteger } from "../helpers"
 import { canEdit, findTagsByName, normalizeTagNames } from "./problem"
 
 export const adminTagRoutes = new Hono<AppEnv>()
@@ -254,18 +255,32 @@ adminTagRoutes.put("/problems/:id/visibility", requireProblemPermission, async (
 
 // ---------------------------------------------------------------- Python → 流程图
 
+/**
+ * 照标准答案画参考流程图。原来让 AI 直接写 Mermaid，老师拿到的是一段代码，要改只能改代码；
+ * 现在出结构树，后台画布直接摆上去，和学生画图是同一个编辑器
+ */
+const PYTHON_TO_FLOWCHART = `把下面这段 Python 标准答案画成流程图，给中职学生看。只返回 JSON：{"steps":[…]}
+每一步是下面五种之一（开始、结束不用写）：
+{"kind":"input","text":"输入 n"}
+{"kind":"output","text":"输出 a（保留两位小数）"}
+{"kind":"process","text":"i = i + 1"}
+{"kind":"if","text":"a > b","yes":[…],"no":[…]}
+{"kind":"while","text":"i < 365","body":[…]}
+- 框里写中文和简单的式子，像课本上那样；不要写 input、print、int、range 这些函数名
+- for 循环改成计数变量 + while：先一个处理框给变量赋初值，while 写条件，循环体最后一个处理框让变量加一
+- elif 写成 else 里再套一个 if
+- break、continue、函数定义尽量改写成等价的顺序 / 判断 / 循环；实在改不了就用一个处理框写一句说明`
+
 adminTagRoutes.post("/problems/flowchart", requireProblemPermission, async (c) => {
   const parsed = await parseBody(c, generateFlowchartRequestSchema, "python 代码不能为空")
   if (!parsed.success) return parsed.response
   try {
-    const flowchart = await completeChat(
-      `你是一个可以将Python代码转换为mermaid的助手。
-请将用户提供的Python代码转换为 Mermaid 纯文本。
-注意括号内的内容用引号包裹，如果本身就有引号，请注意双引号和单引号的问题。
-请只返回 mermaid 代码，连 \`\`\` 都不需要。`,
-      parsed.data.python,
+    const reply = asRecord(
+      JSON.parse(await completeChat(PYTHON_TO_FLOWCHART, parsed.data.python, { json: true })),
     )
-    return success(c, { flowchart } satisfies GenerateFlowchartResponse)
+    const doc = parseFlowDoc({ version: 2, steps: reply.steps })
+    if (!doc || !doc.steps.length) throw new Error("AI returned no flowchart steps")
+    return success(c, { doc: { ...doc } } satisfies GenerateFlowchartResponse)
   } catch (error) {
     console.error("Flowchart generation failed", error)
     return failure(c, 502, "ai-unavailable", "生成失败，请稍后再试")

apps/api/src/routes/flowchart.ts

@@ -4,8 +4,6 @@ import {
   createFlowchartRequestSchema,
   isFlowchartPass,
   type CreateFlowchartResponse,
-  type FlowchartCurrent,
-  type FlowchartDetail,
   type FlowchartScores,
   type FlowchartList,
   type FlowchartListItem,
@@ -612,6 +610,7 @@ flowchartRoutes.get("/flowcharts/statistics", requireTeacher, async (c) => {
       personCount: roster.length,
       completedCount: 0,
       wordFrequencies: [],
+      commonMistakes: [],
       // 一条提交都没有时，花名册上的人**全都**是「没做」—— 原来这里写死空数组，
       // 于是一节课刚开始、最该点名的时候，教师面板反而一个名字都不给
       dataUnaccepted: roster.map((row) => ({
@@ -647,8 +646,16 @@ flowchartRoutes.get("/flowcharts/statistics", requireTeacher, async (c) => {
   const pushText = (value: string) => {
     if (texts.length < WORDCLOUD_TEXT_LIMIT) texts.push(value)
   }
+  const mistakes = new Map<string, number>()
   for (const row of textRows) {
-    for (const [key, value] of Object.entries(asRecord(row.criteria))) {
+    const report = asRecord(row.criteria)
+    if (report.version === 2 && Array.isArray(report.cases)) {
+      const first = report.cases.map((item) => asRecord(item)).find((item) => item.ok === false)
+      if (typeof first?.why === "string" && first.why) {
+        mistakes.set(first.why, (mistakes.get(first.why) ?? 0) + 1)
+      }
+    }
+    for (const [key, value] of Object.entries(report)) {
       const detail = asRecord(value)
       // 和上面那条聚合同一道闸：分数不是数字的项当没配过，满分和评语也都不收
       if (typeof detail.score !== "number") continue
@@ -678,6 +685,10 @@ flowchartRoutes.get("/flowcharts/statistics", requireTeacher, async (c) => {
     personCount: roster.length,
     completedCount: totals.completedCount,
     wordFrequencies: await buildWordFrequencies(texts),
+    commonMistakes: [...mistakes]
+      .sort((a, b) => b[1] - a[1])
+      .slice(0, 8)
+      .map(([text, n]) => ({ text, count: n })),
     dataUnaccepted: roster
       .filter((row) => !submitted.has(row.id))
       .map((row) => ({
@@ -777,10 +788,10 @@ flowchartRoutes.post("/flowcharts/:id/retry", requireAuth, async (c) => {
 
 /**
  * 自己在这道题上评完的每一次，按时间从早到晚，已经滤掉加入题单之前的（题单闸门）。
- * current / history / scores 三个接口都从这一份出。
+ * 结果页签的历次分数（scores）从这一份出。
  *
  * 只取分数和闸门要的几列：整行带着画布 JSON 和 mermaid 源码（一条约 5KB），画了几十次
- * 的学生每切一次题就要搬几百 KB，而结果页签只要分数。要整行的 history 自己按 id 再取。
+ * 的学生每切一次题就要搬几百 KB，而结果页签只要分数。
  * userId / problemId / createTime 三列是 hiddenByProblemSet 要的，别删。
  */
 async function myEvaluatedFlowcharts(user: AuthUser, problemId: number) {
@@ -809,46 +820,9 @@ async function myEvaluatedFlowcharts(user: AuthUser, problemId: number) {
   return { visible, hidden: rows.length - visible.length }
 }
 
-/*
- * current / history：前端从 2026-09-28 起改用下面的 scores + GET /flowcharts/:id，不再调这两个。
- * 先留着给上线那一刻还开着旧页面的浏览器（机房里一节课都不刷新是常态），下一次清理时删掉，
- * 连同契约里的 flowchartCurrentSchema / flowchartDetailSchema。
- */
-flowchartRoutes.get("/problems/:id/flowchart/current", requireAuth, async (c) => {
-  const problemId = queryInteger(c.req.param("id"), 0, { min: 1 })
-  const { visible } = await myEvaluatedFlowcharts(c.get("user")!, problemId)
-  const latest = visible.at(-1)
-  return success(c, {
-    count: visible.length,
-    score: latest?.aiScore ?? 0,
-    grade: latest?.aiGrade ?? "",
-  } satisfies FlowchartCurrent)
-})
-
-flowchartRoutes.get("/problems/:id/flowchart/history", requireAuth, async (c) => {
-  const problemId = queryInteger(c.req.param("id"), 0, { min: 1 })
-  const page = queryInteger(c.req.query("page"), 0, { min: 0 })
-  const user = c.get("user")!
-  const { visible: rows } = await myEvaluatedFlowcharts(user, problemId)
-  const selected = page === 0 ? rows.at(-1) : rows[page - 1]
-  if (page > rows.length) return failure(c, 400, "page-out-of-range", "Page out of range")
-  // 列表只带了分数，选中的那一条再按 id 取整行。都是本人的提交，用户名就是自己的
-  const [full] = selected
-    ? await db
-        .select()
-        .from(schema.flowchartSubmission)
-        .where(eq(schema.flowchartSubmission.id, selected.id))
-        .limit(1)
-    : []
-  return success(c, {
-    submission: full ? flowchartData(full, user.username) : null,
-    count: rows.length,
-  } satisfies FlowchartDetail)
-})
-
 /**
- * 历次分数：结果页签上那一排「第 N 次 xx 分」。原来 history 一次只给一条，
- * 要看分数走势得一页一页翻。`hidden` 是被题单闸门藏起来的次数，界面上给一句说明。
+ * 历次分数：结果页签上那一排「C → B → A」。原来的 history 一次只给一条，
+ * 要看走势得一页一页翻（它和 current 已经删了）。`hidden` 是被题单闸门藏起来的次数，界面上给一句说明。
  */
 flowchartRoutes.get("/problems/:id/flowchart/scores", requireAuth, async (c) => {
   const problemId = queryInteger(c.req.param("id"), 0, { min: 1 })

apps/web/src/admin/api.ts

@@ -117,7 +117,7 @@ export function toggleProblemVisible(problemID: number) {
 }
 
 export function generateFlowchartFromPythonCode(python: string) {
-  return api.post<{ flowchart: string }>("admin/problems/flowchart", {
+  return api.post<{ doc: Record<string, unknown> }>("admin/problems/flowchart", {
     python,
   })
 }
@@ -276,7 +276,9 @@ export function generateTestInputs(data: GenerateTestInputsRequest) {
 
 /** 出站补默认值。字段名两边已经一致，不再做键名转换 */
 function toProblemBody(problem: AdminProblem | BlankProblem) {
-  const p = problem as Partial<AdminProblem>
+  const p = problem as Partial<Omit<AdminProblem, "flowchartData">> & {
+    flowchartData?: Record<string, unknown> | null
+  }
   return {
     _id: p._id,
     title: p.title,
@@ -300,6 +302,7 @@ function toProblemBody(problem: AdminProblem | BlankProblem) {
     allowFlowchart: p.allowFlowchart ?? false,
     showFlowchart: p.showFlowchart ?? false,
     mermaidCode: p.mermaidCode ?? null,
+    flowchartData: p.flowchartData ?? null,
     flowchartHint: p.flowchartHint ?? null,
     astRules: p.astRules ?? null,
     sqlConfig: p.sqlConfig ?? null,

apps/web/src/admin/problem/components/CodePreview.vue

@@ -34,7 +34,6 @@ const props = defineProps<{
   astChecks: AstCheckState
   flowchartMode: FlowchartMode
   mermaidCode: string
-  flowchartHint: string
 }>()
 
 const tab = defineModel<PreviewTab>("tab", { required: true })
@@ -248,18 +247,15 @@ onMounted(() => nextTick(render))
     <!-- 流程图：一直挂着，改了图的代码随时知道画不画得出来 -->
     <div v-show="tab === 'flowchart'" class="page">
       <p v-if="flowchartMode === 'none'" class="placeholder">这道题不用流程图</p>
-      <p v-else-if="flowchartMode === 'draw'" class="muted small">
-        学生自己画，这张图<b>学生看不到</b>，只拿来给学生画的图打分。
-        <template v-if="flowchartHint.trim()">学生看到的提示：{{ flowchartHint }}</template>
+      <p v-else-if="flowchartMode === 'draw'" class="placeholder">
+        学生在题目页右边自己画，交上去按例子和测试数据评
       </p>
-      <p v-else class="muted small">学生在题面里点开「老师给的参考流程图」看到的是：</p>
-      <p v-if="flowchartMode !== 'none' && !mermaidCode.trim()" class="placeholder">
-        还没写图的代码
-      </p>
-      <div v-if="renderError && flowchartMode !== 'none'" class="chartError">
-        画不出来：{{ renderError }}
-      </div>
-      <div v-show="flowchartMode !== 'none'" ref="chart" class="chart"></div>
+      <template v-else>
+        <p class="muted small">学生在题面里点开「老师给的参考流程图」看到的是：</p>
+        <p v-if="!mermaidCode.trim()" class="placeholder">还没画</p>
+        <div v-if="renderError" class="chartError">画不出来：{{ renderError }}</div>
+      </template>
+      <div v-show="flowchartMode === 'show'" ref="chart" class="chart"></div>
     </div>
   </aside>
 </template>

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

@@ -42,8 +42,17 @@ import {
   type TemplateParts,
 } from "./components/codeTemplate"
 import type { AstCheckState, FlowchartMode, PreviewTab } from "./components/editorTypes"
+import {
+  emptyDoc,
+  parseDoc,
+  toMermaid,
+  type FlowDoc,
+} from "shared/components/FlowchartEditor/model"
 
 const CodeEditor = defineAsyncComponent(() => import("shared/components/CodeEditor.vue"))
+const FlowchartEditor = defineAsyncComponent(
+  () => import("shared/components/FlowchartEditor/index.vue"),
+)
 
 /**
  * 编程题（C / C++ / Python）的出题页，设计稿「编程题出题页」方案 B：左边写，右边是学生
@@ -93,6 +102,8 @@ interface CodeForm {
   astRules: AstRules | null
   flowchartMode: FlowchartMode
   mermaidCode: string
+  /** 画布画的参考流程图；null 是老题（只有手写的 Mermaid）或者还没画 */
+  flowchartDoc: FlowDoc | null
   flowchartHint: string
 }
 
@@ -118,6 +129,7 @@ const blankForm = (): CodeForm => ({
   astRules: null,
   flowchartMode: "none",
   mermaidCode: "",
+  flowchartDoc: null,
   flowchartHint: "",
 })
 
@@ -437,13 +449,26 @@ const FLOWCHART_LABEL: Record<FlowchartMode, string> = {
 }
 
 const mermaidOk = ref(false)
+
+/**
+ * 老题的参考图是手写的 Mermaid（没有结构树）：照旧给代码框；新画的、或者点了「改用画布画」
+ * 的用画布。保存时画布的图以它为准，后端照它重新生成 Mermaid
+ */
+const legacyMermaid = computed(() => !form.flowchartDoc && !!form.mermaidCode.trim())
+/** 右边预览画的那张：画布有图就照画布生成，不然是老的代码 */
+const previewMermaid = computed(() => {
+  if (!form.flowchartDoc) return form.mermaidCode
+  return form.flowchartDoc.steps.length ? toMermaid(form.flowchartDoc) : ""
+})
 const aiDrawing = ref(false)
 
 async function aiFlowchart() {
   aiDrawing.value = true
   try {
     const res = await generateFlowchartFromPythonCode(form.answers.Python)
-    form.mermaidCode = res.flowchart
+    const doc = parseDoc(res.doc)
+    if (!doc) throw new Error("AI 画出来的图读不了")
+    form.flowchartDoc = doc
     preview.value = "flowchart"
   } catch (err) {
     message.error(errorMessage(err, "生成失败，请稍后再试"))
@@ -599,6 +624,7 @@ async function loadProblem(data: AdminProblem) {
     astRules: data.astRules ?? null,
     flowchartMode: data.allowFlowchart ? "draw" : data.showFlowchart ? "show" : "none",
     mermaidCode: data.mermaidCode ?? "",
+    flowchartDoc: parseDoc(data.flowchartData),
     flowchartHint: data.flowchartHint ?? "",
   } satisfies CodeForm)
   answerTab.value = RUNNABLE.find((l) => languages.includes(l) && answers[l].trim()) ?? "Python"
@@ -703,10 +729,17 @@ const blockers = computed<Blocker[]>(() => {
           })
       })
   }
-  if (form.flowchartMode !== "none") {
-    if (!form.mermaidCode.trim()) list.push({ text: "写流程图的代码", section: "flowchart" })
-    else if (!mermaidOk.value)
-      list.push({ text: "改好流程图的代码（画不出来）", section: "flowchart", severe: true })
+  if (form.flowchartMode === "show") {
+    if (legacyMermaid.value) {
+      if (!mermaidOk.value)
+        list.push({ text: "改好流程图的代码（画不出来）", section: "flowchart", severe: true })
+    } else if (!form.flowchartDoc?.steps.length) {
+      list.push({ text: "画参考流程图", section: "flowchart" })
+    }
+  }
+  // 学生画的图拼成程序拿例子和测试数据跑（flowchart/program.ts），一组例子都没有就没得评
+  if (form.flowchartMode === "draw" && !examples.value.length) {
+    list.push({ text: "勾至少一组测试数据当例子（流程图照例子评）", section: "cases" })
   }
   return list
 })
@@ -775,6 +808,10 @@ async function save() {
       allowFlowchart: form.flowchartMode === "draw",
       showFlowchart: form.flowchartMode === "show",
       mermaidCode: form.flowchartMode === "none" ? form.mermaidCode : form.mermaidCode.trim(),
+      flowchartData:
+        form.flowchartMode === "show" && form.flowchartDoc?.steps.length
+          ? { ...form.flowchartDoc }
+          : null,
       flowchartHint: form.flowchartHint.trim(),
       astRules: form.astRules,
       sqlConfig: null,
@@ -1196,15 +1233,27 @@ onMounted(async () => {
             <label class="mode" :class="{ on: form.flowchartMode === 'draw' }">
               <n-radio value="draw" />
               <span>
-                <b>让学生自己画，按这张图打分</b>
-                <small>这张图学生看不到，只拿来给学生画的图打分；画到 A / S 级算做完</small>
+                <b>让学生自己画</b>
+                <small>按例子和测试数据评；画到 A / S 级算做完</small>
               </span>
             </label>
           </n-radio-group>
-          <template v-if="form.flowchartMode !== 'none'">
+          <!-- 学生画：按例子和测试数据评（拼成程序跑），不再需要参考图 -->
+          <n-text v-if="form.flowchartMode === 'draw'" depth="3" class="note">
+            学生画的图会拼成程序，拿这道题的例子和测试数据跑一遍，逐组看输出对不对，不用准备参考图。
+          </n-text>
+          <template v-if="form.flowchartMode === 'show'">
             <div class="inlineRow">
-              <span class="label">图的代码（Mermaid）</span>
+              <span class="label">{{ legacyMermaid ? "图的代码（Mermaid）" : "参考流程图" }}</span>
               <span class="grow"></span>
+              <n-button
+                v-if="legacyMermaid"
+                size="tiny"
+                quaternary
+                @click="form.flowchartDoc = emptyDoc()"
+              >
+                改用画布画
+              </n-button>
               <n-button
                 size="tiny"
                 :loading="aiDrawing"
@@ -1215,25 +1264,20 @@ onMounted(async () => {
                 AI 照 Python 答案画一张
               </n-button>
             </div>
-            <n-input
-              v-model:value="form.mermaidCode"
-              type="textarea"
-              class="mono"
-              :autosize="{ minRows: 6, maxRows: 18 }"
-              placeholder="graph TD&#10;    A[开始] --> B[输入 n]"
-            />
-            <n-text
-              v-if="form.mermaidCode.trim()"
-              :type="mermaidOk ? 'success' : 'error'"
-              class="note"
-            >
-              {{ mermaidOk ? "✓ 画得出来（右边就是）" : "✗ 还画不出来，看右边的报错" }}
-            </n-text>
-            <n-input
-              v-if="form.flowchartMode === 'draw'"
-              v-model:value="form.flowchartHint"
-              placeholder="给学生的提示（选填），比如：先判断门是不是开着"
-            />
+            <template v-if="legacyMermaid">
+              <n-input
+                v-model:value="form.mermaidCode"
+                type="textarea"
+                class="mono"
+                :autosize="{ minRows: 6, maxRows: 18 }"
+              />
+              <n-text :type="mermaidOk ? 'success' : 'error'" class="note">
+                {{ mermaidOk ? "✓ 画得出来（右边就是）" : "✗ 还画不出来，看右边的报错" }}
+              </n-text>
+            </template>
+            <div v-else class="flowCanvas">
+              <FlowchartEditor v-model:value="form.flowchartDoc" :draft="false" height="460px" />
+            </div>
           </template>
         </template>
       </section>
@@ -1326,8 +1370,7 @@ onMounted(async () => {
       :ast-rules="form.astRules"
       :ast-checks="astChecks"
       :flowchart-mode="form.flowchartMode"
-      :mermaid-code="form.mermaidCode"
-      :flowchart-hint="form.flowchartHint"
+      :mermaid-code="previewMermaid"
       @render-state="mermaidOk = $event"
       @collapse="previewCollapsed = true"
     />
@@ -1658,4 +1701,10 @@ onMounted(async () => {
 .blocker:hover {
   text-decoration: underline;
 }
+
+.flowCanvas {
+  border: 1px solid v-bind("theme.borderColor");
+  border-radius: 6px;
+  overflow: hidden;
+}
 </style>

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

@@ -206,13 +206,13 @@ const changeLanguage = (v: LANGUAGE) => {
       运行例子
     </n-button>
 
-    <SubmitFlowchart v-if="codeStore.code.language === 'Flowchart'" />
+    <SubmitFlowchart v-if="codeStore.code.language === 'Flowchart' && isDesktop" />
 
     <SubmitCode v-else-if="isDesktop" />
 
     <div class="spacer" />
 
-    <FlowchartControls v-if="drawing && isDesktop" />
+    <FlowchartControls v-if="drawing" />
 
     <n-button
       v-if="showHelpButton"

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

@@ -2,6 +2,7 @@
 import { useThemeVars } from "naive-ui"
 import { storeToRefs } from "pinia"
 import { useFlowchartStore } from "oj/store/flowchart"
+import { useBreakpoints } from "shared/composables/breakpoints"
 import { parseTime } from "utils/functions"
 
 /**
@@ -11,6 +12,8 @@ import { parseTime } from "utils/functions"
  */
 const { editor, unchanged } = storeToRefs(useFlowchartStore())
 const theme = useThemeVars()
+// 手机上工具栏挤，「已保存」那几个字不放
+const { isDesktop } = useBreakpoints()
 
 const saved = computed(() => {
   // 「交给 AI 点评」灰着的时候说一句为什么（设计稿 FlowResPass）
@@ -22,7 +25,7 @@ const saved = computed(() => {
 
 <template>
   <div v-if="editor" class="flowchart-controls">
-    <span v-if="saved" class="saved">{{ saved }}</span>
+    <span v-if="saved && isDesktop" class="saved">{{ saved }}</span>
     <n-button
       :disabled="!editor.canUndo"
       aria-label="撤销"

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

@@ -17,9 +17,7 @@ import { caseHeadline, caseReport } from "utils/flowchart"
  * 原来评分详情是提交按钮旁一个 1000px 的弹框：盖住画布，学生没法一边看改进建议一边改图；
  * 翻历次评分要一页一页点分页器。现在摆在左栏，画布整列都在右边（设计文档第 6 节）。
  *
- * viewOnly：手机上只能看、不能画（设计文档 5.6），不给「照着它写代码」「载回画布」。
  */
-const { viewOnly = false } = defineProps<{ viewOnly?: boolean }>()
 
 const MyFlowchart = defineAsyncComponent(() => import("./MyFlowchart.vue"))
 
@@ -154,7 +152,7 @@ watch(
 watch(
   () => [selectedCase.value, report.value, canvasSame.value, editor.value] as const,
   ([index, next, same, instance]) => {
-    if (!instance || viewOnly) return
+    if (!instance) return
     const row = index === null ? undefined : next?.cases[index]
     if (!row || !same || !versionDoc.value) {
       instance.setHighlight(null)
@@ -189,11 +187,7 @@ function goCode() {
     <n-empty
       v-else-if="!scores.length && phase !== 'evaluating'"
       class="empty"
-      :description="
-        viewOnly
-          ? '还没交过流程图。流程图要在电脑上画（手机上拖不动），交给 AI 点评之后，评分和建议在这里也看得到'
-          : '还没交过流程图。画好之后点「交给 AI 点评」，评分和建议会出现在这里'
-      "
+      description="还没交过流程图。画好之后点「交给 AI 点评」，评分和建议会出现在这里"
     />
 
     <!-- 历次分数连成一条：一眼看出是不是越改越好；正在评的那次是虚线框 -->
@@ -273,7 +267,7 @@ function goCode() {
       </template>
 
       <template v-if="detail">
-        <div v-if="detail.mermaidCode && (!report || canvasDiffers || viewOnly)" class="version">
+        <div v-if="detail.mermaidCode && (!report || canvasDiffers)" class="version">
           <div class="version-head">
             <span class="version-title">{{ versionTitle }}</span>
             <n-button text type="primary" size="small" @click="versionZoom = true">
@@ -327,7 +321,7 @@ function goCode() {
           </div>
         </div>
 
-        <div v-if="!viewOnly" class="actions">
+        <div class="actions">
           <n-button
             v-if="isFlowchartPass(current.grade) && canCode"
             type="primary"

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

@@ -6,6 +6,8 @@ import { useProblemStore } from "oj/store/problem"
 import { useSubmissionStore } from "oj/store/submission"
 import SubmitCode from "./SubmitCode.vue"
 
+const SubmitFlowchart = defineAsyncComponent(() => import("./SubmitFlowchart.vue"))
+
 /**
  * 手机上屏幕底部固定的「运行例子 / 提交」（设计文档 5.6）。原来这两个按钮在「代码」页签
  * 顶上，和语言、更多挤成两行；看着题面想交一次，还得先切回代码页签。
@@ -41,7 +43,8 @@ const canRunSamples = computed(
       运行例子
     </n-button>
     <div class="action">
-      <SubmitCode size="large" block />
+      <SubmitFlowchart v-if="codeStore.code.language === 'Flowchart'" size="large" block />
+      <SubmitCode v-else size="large" block />
     </div>
   </div>
 </template>

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

@@ -191,13 +191,12 @@ watch(
 )
 
 // 流程图编辑器交给 store：结果页签（在左栏，不在编辑器底下）要拿当前画布比一比、
-// 把旧版本载回去。子组件 SubmitFlowchart 还是从 inject 拿
+// 把旧版本载回去；「交给 AI 点评」在手机上挂在屏幕底部那条，也从 store 拿
 const flowchartStore = useFlowchartStore()
 watch(flowchartEditorRef, (editor) => flowchartStore.attachEditor(editor ?? null), {
   immediate: true,
 })
 onBeforeUnmount(() => flowchartStore.attachEditor(null))
-provide("flowchartEditorRef", flowchartEditorRef)
 </script>
 
 <template>

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

@@ -5,8 +5,6 @@ import { useProblemStore } from "oj/store/problem"
 import { useSubmissionStore } from "oj/store/submission"
 import { useCodeStore } from "oj/store/code"
 import { useTeacherCollab } from "../composables/teacherCollab"
-import { useProblemPageContext } from "../composables/problemPageContext"
-import { useBreakpoints } from "shared/composables/breakpoints"
 import { useThemeVars } from "naive-ui"
 import { parseTime } from "utils/functions"
 import ResultHeader from "./ResultHeader.vue"
@@ -33,8 +31,6 @@ const { submission, syntaxErrorInfo, resultSegment, formattedBeforeSubmit } =
   storeToRefs(submissionStore)
 const { problem } = storeToRefs(useProblemStore())
 const codeStore = useCodeStore()
-const ctx = useProblemPageContext()
-const { isDesktop } = useBreakpoints()
 
 /** 协作中的老师自己还没交过：先摆学生最近一次交的 */
 const teacherCollab = useTeacherCollab()
@@ -42,24 +38,7 @@ const teacherCollab = useTeacherCollab()
 const theme = useThemeVars()
 const { samplesRunAt } = submissionStore.trial
 
-/**
- * 手机上流程图题只能看点评、不能画（设计文档 5.6）。画不了，语言也就落不到 Flowchart 上，
- * 下面的 drawing 永远是假 —— 原来学生在电脑上画过、AI 评过的，手机上一条都看不到。
- * 这时多给一段「流程图点评」，只读。
- */
-const flowchartReadable = computed(
-  () => !isDesktop.value && !!problem.value?.allowFlowchart && ctx.value.entry !== "contest",
-)
-/** 在看「流程图点评」那一段。只在这一页记着：点运行例子、提交时照常切回对应的分段 */
-const viewingFlowchart = ref(false)
-watch(
-  () => [submissionStore.resultSeq, problem.value?.id, flowchartReadable.value],
-  () => {
-    viewingFlowchart.value = false
-  },
-)
-
-type Segment = "submit" | "samples" | "custom" | "flowchart"
+type Segment = "submit" | "samples" | "custom"
 const codeSegments = computed<{ value: Segment; label: string; time: string }[]>(() => [
   {
     value: "submit",
@@ -84,25 +63,16 @@ const drawing = computed(() => codeStore.code.language === "Flowchart")
 // 试跑走判题机，SQL 题不走那里；流程图也没得跑。这两种只留「提交结果」
 const canTrial = computed(() => !problem.value || !isSqlProblem(problem.value))
 
-const segments = computed(() => {
-  const list = canTrial.value ? codeSegments.value : codeSegments.value.slice(0, 1)
-  return flowchartReadable.value
-    ? [...list, { value: "flowchart" as const, label: "流程图点评", time: "" }]
-    : list
-})
-/** 只有一段（SQL 题、又不是手机上的流程图题）就不摆分段了 */
+const segments = computed(() =>
+  canTrial.value ? codeSegments.value : codeSegments.value.slice(0, 1),
+)
+/** 只有一段（SQL 题）就不摆分段了 */
 const showSegments = computed(() => segments.value.length > 1)
 
 function isActive(segment: Segment) {
-  if (viewingFlowchart.value) return segment === "flowchart"
   return resultSegment.value === segment
 }
 function pick(segment: Segment) {
-  if (segment === "flowchart") {
-    viewingFlowchart.value = true
-    return
-  }
-  viewingFlowchart.value = false
   resultSegment.value = segment
 }
 </script>
@@ -124,14 +94,13 @@ function pick(segment: Segment) {
       >
         {{ segment.label }}<template v-if="segment.time"> · {{ segment.time }}</template>
       </button>
-      <span v-if="!viewingFlowchart && resultSegment === 'custom'" class="segment-note"
+      <span v-if="resultSegment === 'custom'" class="segment-note"
         >自己编数据试试，这里不判对错</span
       >
     </div>
 
-    <FlowchartResult v-if="viewingFlowchart && flowchartReadable" view-only />
     <!-- 提交结果用 v-show：切去看运行例子时不卸载，挂着的错误说明在编辑器里标着红 -->
-    <div v-show="!viewingFlowchart && (resultSegment === 'submit' || !canTrial)">
+    <div v-show="resultSegment === 'submit' || !canTrial">
       <template v-if="syntaxErrorInfo">
         <ResultHeader kind="warning" title="代码有语法错误，还没有交上去" />
         <CompileErrorExplain :err-info="syntaxErrorInfo" />
@@ -149,7 +118,7 @@ function pick(segment: Segment) {
         description="还没有提交过。写完代码按「提交」，结果会出现在这里"
       />
     </div>
-    <template v-if="canTrial && !viewingFlowchart">
+    <template v-if="canTrial">
       <SampleRunResult v-if="resultSegment === 'samples'" />
       <CustomRun v-else-if="resultSegment === 'custom'" />
     </template>

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

@@ -3,7 +3,7 @@ import { storeToRefs } from "pinia"
 import { useBreakpoints } from "shared/composables/breakpoints"
 import { countBlank } from "shared/components/FlowchartEditor/model"
 import { useProblemStore } from "oj/store/problem"
-import { useFlowchartStore, type FlowchartEditorInstance } from "oj/store/flowchart"
+import { useFlowchartStore } from "oj/store/flowchart"
 
 /**
  * 「交给 AI 点评」按钮。
@@ -13,16 +13,20 @@ import { useFlowchartStore, type FlowchartEditorInstance } from "oj/store/flowch
  * 弹框盖住画布，学生没法一边看改进建议一边改图。
  */
 
-const flowchartEditorRef = inject<Ref<FlowchartEditorInstance | null>>("flowchartEditorRef")
+/** 手机上它在屏幕底部那条（MobileActionBar），不在编辑器里面，所以画布从 store 拿 */
+const { size, block = false } = defineProps<{
+  size?: "small" | "medium" | "large"
+  block?: boolean
+}>()
 
 const message = useMessage()
 const { problem } = storeToRefs(useProblemStore())
 const flowchartStore = useFlowchartStore()
-const { loading, unchanged } = storeToRefs(flowchartStore)
+const { loading, unchanged, editor: canvas } = storeToRefs(flowchartStore)
 const { isDesktop } = useBreakpoints()
 
 function submit() {
-  const editor = flowchartEditorRef?.value
+  const editor = canvas.value
   if (!editor) return
   const doc = editor.getDoc()
   if (!doc.steps.length) {
@@ -44,7 +48,8 @@ watch(() => problem.value?.id, flowchartStore.ensureLoaded, { immediate: true })
 
 <template>
   <n-button
-    :size="isDesktop ? 'medium' : 'small'"
+    :size="size ?? (isDesktop ? 'medium' : 'small')"
+    :block="block"
     type="primary"
     :loading="loading"
     :disabled="loading || unchanged"

apps/web/src/oj/statistics/components/FlowStats.vue

@@ -200,13 +200,11 @@ const people = computed(() => [
   ...props.data.dataUnaccepted.map((row) => ({
     username: row.username,
     grade: null as string | null,
-    score: null as number | null,
     count: 0,
   })),
   ...props.data.people.map((row) => ({
     username: row.username,
     grade: row.bestGrade,
-    score: row.bestScore,
     count: row.count,
   })),
 ])
@@ -229,7 +227,6 @@ function gradeStyle(grade: string | null) {
   <div class="flow-stats">
     <div class="summary">
       <StatItem label="提交" :value="data.totalCount" unit="张" />
-      <StatItem label="平均分" :value="data.avgScore" />
       <StatItem
         label="拿到 A / S"
         :value="`${goodCount} / ${personCount}`"
@@ -267,31 +264,54 @@ function gradeStyle(grade: string | null) {
             <Doughnut :key="chartKey" :data="gradeData" :options="gradeOptions" />
           </div>
         </div>
-        <div v-if="criteria.length" class="card radar">
-          <div class="card-title">四项评分（平均得分率）</div>
-          <div class="chart">
-            <Radar :key="chartKey" :data="radarData" :options="radarOptions" />
+        <template v-if="criteria.length">
+          <div class="card radar">
+            <div class="card-title">四项评分（平均得分率）</div>
+            <div class="chart">
+              <Radar :key="chartKey" :data="radarData" :options="radarOptions" />
+            </div>
           </div>
-        </div>
-        <div v-if="criteria.length" class="card grow">
-          <div class="card-title">各项平均分</div>
-          <div class="chart"><Bar :key="chartKey" :data="barData" :options="barOptions" /></div>
+          <div class="card grow">
+            <div class="card-title">各项平均分</div>
+            <div class="chart"><Bar :key="chartKey" :data="barData" :options="barOptions" /></div>
+          </div>
+        </template>
+        <!-- 全是 2026-10 之后「走例子」评的图：没有四项分，这个位置给最常见的错 -->
+        <div v-else class="card grow">
+          <div class="card-title">最常见的错（最近交的图里）</div>
+          <ol v-if="data.commonMistakes.length" class="mistakes">
+            <li v-for="item in data.commonMistakes" :key="item.text">
+              <span class="mistake-text">{{ item.text }}</span>
+              <span class="muted">{{ item.count }} 张</span>
+            </li>
+          </ol>
+          <div v-else class="muted">交上来的图都走对了</div>
         </div>
       </div>
       <div class="row-cards bottom">
-        <div class="card grow">
+        <!-- 新老评法混着：有走例子的错就列错，只有老数据时照旧是词云 -->
+        <div v-if="criteria.length && data.commonMistakes.length" class="card grow">
+          <div class="card-title">最常见的错（最近交的图里）</div>
+          <ol class="mistakes">
+            <li v-for="item in data.commonMistakes" :key="item.text">
+              <span class="mistake-text">{{ item.text }}</span>
+              <span class="muted">{{ item.count }} 张</span>
+            </li>
+          </ol>
+        </div>
+        <div v-else-if="criteria.length" class="card grow">
           <div class="card-title">常见问题高频词（最近的评语里）</div>
           <div class="cloud"><canvas ref="cloudCanvas"></canvas></div>
           <div v-if="!data.wordFrequencies.length" class="muted">评语太少，还拼不出词云</div>
         </div>
-        <div class="card people">
+        <div class="card people" :class="{ wide: !criteria.length }">
           <div class="card-title">每人最好的一次（没交的在前）</div>
           <div v-if="data.peopleTruncated" class="muted">人太多，只列了成绩靠后的 500 位</div>
           <div class="people-list">
             <div v-for="row in people" :key="row.username" class="person">
               <UserName :username="row.username" class="p-name" />
               <span class="grade-pill" :style="gradeStyle(row.grade)">
-                {{ row.grade ? `${row.grade} 级 ${row.score ?? 0} 分` : "没交" }}
+                {{ row.grade ? `${row.grade} 级` : "没交" }}
               </span>
               <span class="muted">{{ row.count }} 次</span>
             </div>
@@ -489,4 +509,35 @@ function gradeStyle(grade: string | null) {
     max-height: 360px;
   }
 }
+
+.mistakes {
+  margin: 0;
+  padding-left: 20px;
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+  font-size: 14px;
+  line-height: 1.6;
+}
+
+.mistakes li {
+  padding-left: 2px;
+}
+
+.mistake-text {
+  margin-right: 8px;
+}
+
+/* 没有词云、四项分的时候，每人一格铺满一行 */
+.card.people.wide {
+  flex: 1 1 0;
+  width: auto;
+}
+
+.card.people.wide .people-list {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
+  align-content: start;
+  column-gap: 24px;
+}
 </style>

apps/web/src/oj/store/problem.ts

@@ -1,5 +1,4 @@
 import { defineStore } from "pinia"
-import { useBreakpoints } from "shared/composables/breakpoints"
 import type { LANGUAGE, ProblemDetail } from "utils/types"
 import { problemEntryOf } from "oj/problem/composables/problemPageContext"
 import { useCodeStore } from "oj/store/code"
@@ -28,14 +27,13 @@ export const useProblemStore = defineStore("problem", () => {
    */
   const failCount = computed(() => (problem.value?.myFailedCount ?? 0) + sessionFailCount.value)
 
-  const { isDesktop } = useBreakpoints()
-
   /**
    * 这道题能不能画流程图。比赛里不给（入口差异表）；题单里原来也不给，现在给了，画到 A/S
-   * 算完成（设计文档第 3 节决定 4）。手机上不给：节点库是 HTML5 拖放，手机上拖不动。
+   * 算完成（设计文档第 3 节决定 4）。手机上原来不给（节点库是 HTML5 拖放，拖不动），
+   * 2026-10 换成插入式编辑器之后只用点，手机上也能画
    */
   const canDraw = computed(
-    () => !!problem.value?.allowFlowchart && problemEntryOf(route) !== "contest" && isDesktop.value,
+    () => !!problem.value?.allowFlowchart && problemEntryOf(route) !== "contest",
   )
 
   /**

apps/web/src/shared/components/FlowchartEditor/index.vue

@@ -30,8 +30,14 @@ import { layoutDoc, PLACEHOLDER, type LaidNode, type LaidSlot } from "./layout"
 
 interface Props {
   height?: string
+  /**
+   * 题目页（默认）：每道题一份本地草稿，自动存。
+   * false：图交给外面管（后台出题页的参考流程图，v-model:value），不存草稿
+   */
+  draft?: boolean
 }
-const { height = "calc(100vh - 134px)" } = defineProps<Props>()
+const { height = "calc(100vh - 134px)", draft = true } = defineProps<Props>()
+const model = defineModel<FlowDoc | null>("value", { default: null })
 
 const message = useMessage()
 const theme = useThemeVars()
@@ -98,6 +104,13 @@ const cacheKey = computed(() => {
 const savedAt = ref<Date | null>(null)
 
 function loadDraft() {
+  if (!draft) {
+    doc.value = model.value ? cloneDoc(model.value) : emptyDoc()
+    deselect()
+    resetHistory()
+    fitSoon()
+    return
+  }
   let saved: unknown = null
   try {
     saved = storage.get(cacheKey.value)
@@ -135,12 +148,20 @@ watch(
   doc,
   () => {
     if (loading) return
-    saveDraft(cacheKey.value)
+    if (draft) saveDraft(cacheKey.value)
+    else model.value = cloneDoc(doc.value)
   },
   { deep: true },
 )
 
+/** 外面换了一张图（后台点了「AI 照答案画一张」）：摆上来，进历史，Ctrl+Z 能回去 */
+watch(model, (next) => {
+  if (draft || !next || signature(next) === signature(doc.value)) return
+  setDoc(next)
+})
+
 watch(cacheKey, () => {
+  if (!draft) return
   loading = true
   loadDraft()
   nextTick(() => (loading = false))

apps/web/src/utils/types.ts

@@ -143,7 +143,10 @@ type ExcludeKeys =
   | "isPublic"
   | "contestId"
 
-export type BlankProblem = Omit<AdminProblem, ExcludeKeys | "hint" | "mermaidCode"> & {
+export type BlankProblem = Omit<
+  AdminProblem,
+  ExcludeKeys | "hint" | "mermaidCode" | "flowchartData"
+> & {
   id?: number
   // 新建比赛题时由 detail.vue 在提交前写进来
   contestId?: number | null
@@ -151,6 +154,8 @@ export type BlankProblem = Omit<AdminProblem, ExcludeKeys | "hint" | "mermaidCod
   // v-model 要的是 lvalue，模板里没法 ?? 兜底，所以在类型上就收掉 null
   hint: string
   mermaidCode: string
+  /** 画布画的参考流程图（FlowDoc）；不给就照存 mermaidCode（老题手写的 Mermaid） */
+  flowchartData?: Record<string, unknown> | null
 }
 
 export interface ProblemRow {

packages/contract/src/admin.ts

@@ -675,8 +675,9 @@ export const generateFlowchartRequestSchema = z.object({
     .min(1)
     .max(64 * 1024),
 })
+/** AI 照 Python 答案画的参考流程图：结构树（FlowDoc），后台画布直接摆上去接着改 */
 export const generateFlowchartResponseSchema = z.object({
-  flowchart: z.string(),
+  doc: z.record(z.string(), z.unknown()),
 })
 
 // ---------------------------------------------------------------- 题目管理
@@ -771,6 +772,8 @@ export const adminProblemSchema = z.object({
   allowFlowchart: z.boolean(),
   showFlowchart: z.boolean(),
   mermaidCode: z.string().nullable(),
+  /** 参考流程图的结构树（FlowDoc）；2026-10 之前出的题只有 mermaidCode，这里是空对象 */
+  flowchartData: z.record(z.string(), z.unknown()),
   flowchartHint: z.string().nullable(),
   astRules: astRulesSchema.nullable(),
   answers: z.array(problemAnswerSchema),
@@ -823,6 +826,11 @@ export const createProblemRequestSchema = z.object({
   allowFlowchart: z.boolean().default(false),
   showFlowchart: z.boolean().default(false),
   mermaidCode: z.string().nullable().default(null),
+  /**
+   * 用画布画的参考流程图（FlowDoc）。给了就以它为准，mermaidCode 由后端照它重新生成；
+   * 不给（老题只有手写的 Mermaid）就原样存 mermaidCode
+   */
+  flowchartData: z.record(z.string(), z.unknown()).nullable().default(null),
   flowchartHint: z.string().nullable().default(null),
   astRules: astRulesSchema.nullable().default(null),
   // order_sensitive 缺省补 false —— 与旧后端 SQLConfigSerializer 的

packages/contract/src/flowchart.ts

@@ -66,16 +66,6 @@ export const createFlowchartResponseSchema = z.object({
   submissionId: z.string(),
   status: z.literal("pending"),
 })
-export const flowchartCurrentSchema = z.object({
-  count: z.number().int(),
-  score: z.number(),
-  grade: z.string(),
-})
-export const flowchartDetailSchema = z.object({
-  submission: flowchartSubmissionSchema.nullable(),
-  count: z.number().int(),
-})
-
 /**
  * 流程图画到这两档算这道题做完：题单进度、课堂条、课堂看板、「你画的流程图」、结果页签的 ✓
  * 都按它（设计文档 2026-09-28-problem-page-redesign 第 3 节决定 4、6）。前后端只有这一份
@@ -107,6 +97,12 @@ export const flowchartStatisticsSchema = z.object({
   personCount: z.number().int(),
   completedCount: z.number().int(),
   wordFrequencies: z.array(z.object({ word: z.string(), count: z.number().int() })),
+  /**
+   * 2026-10 起「走例子」评的图里最常见的错：每张图取第一组没走对的原因（「『一级果』多输出了
+   * 一行『一级果』」），同一句话数一下，最多 8 条。新评法几乎没有评语，词云拼不出来，
+   * 而同一个错在一个班里往往原样出现几十次 —— 老师要看的就是它
+   */
+  commonMistakes: z.array(z.object({ text: z.string(), count: z.number().int() })),
   // 与提交统计共用「未完成学生」的形状，见 submission.ts 的 unacceptedStudentSchema
   dataUnaccepted: z.array(z.object({ username: z.string(), realName: z.string() })),
   /**
@@ -177,8 +173,6 @@ export type FlowchartStatistics = z.infer<typeof flowchartStatisticsSchema>
 export type FlowchartSubmission = z.infer<typeof flowchartSubmissionSchema>
 export type FlowchartListItem = z.infer<typeof flowchartListItemSchema>
 export type FlowchartList = z.infer<typeof flowchartListSchema>
-export type FlowchartCurrent = z.infer<typeof flowchartCurrentSchema>
-export type FlowchartDetail = z.infer<typeof flowchartDetailSchema>
 export type FlowchartScores = z.infer<typeof flowchartScoresSchema>
 export type CreateFlowchartResponse = z.infer<typeof createFlowchartResponseSchema>
 export type CreateFlowchartRequest = z.infer<typeof createFlowchartRequestSchema>