diff --git a/apps/web/src/shared/composables/useMermaid.ts b/apps/web/src/shared/composables/useMermaid.ts
index ddda49a..c7039a0 100644
--- a/apps/web/src/shared/composables/useMermaid.ts
+++ b/apps/web/src/shared/composables/useMermaid.ts
@@ -6,8 +6,6 @@
  * pele 的版本号锁死（不带 ^）：项目 2026-10 才开，小版本也在改排版。
  */
 
-import { normalizeLegacyFlowchart } from "utils/legacyFlowchart"
-
 const semanticNodeClasses = [
   "startNode",
   "endNode",
@@ -137,8 +135,7 @@ export function useMermaid() {
     try {
       // pele/lazy 按图的类型现拉对应的模块，题目里绝大多数是流程图，只拉那一块
       const { renderAsync } = await import("pele/lazy")
-      // 老师手写的老参考图一个框的种类都没标，先按标准符号重排（见 legacyFlowchart.ts）
-      const { svg } = await renderAsync(normalizeLegacyFlowchart(mermaidCode), {
+      const { svg } = await renderAsync(mermaidCode, {
         // 量字宽用页面真实的字体，否则框会比字窄或宽
         fontFamily: getComputedStyle(container).fontFamily,
         // 题目是老师写的、提交是学生写的，图里的链接和外链图片一律不画
diff --git a/apps/web/src/utils/legacyFlowchart.ts b/apps/web/src/utils/legacyFlowchart.ts
deleted file mode 100644
index 3e1cc24..0000000
--- a/apps/web/src/utils/legacyFlowchart.ts
+++ /dev/null
@@ -1,113 +0,0 @@
-/**
- * 老师手写的老参考流程图，显示前按标准符号重排。
- *
- * 现在的流程图（学生的画布、出题页的参考图）都由结构树生成，每个框带 `class nX input` 这样的
- * 种类，useMermaid 按种类上标准的形状和颜色。2026-10 之前老师直接手写 Mermaid 的参考图
- * （库里 36 张，全是这种）一个种类都没标：输入写成普通方框 `B[输入n]`、开始写成正圆，
- * 显示时只能按框里的字分彩色，和学生图上的标准符号对不上。
- *
- * 这里只处理**一个种类都没标**的图（学生的老提交全都标了，不受影响），按写法和字认框：
- * 花括号是判断；字是「开始 / 结束」的是起止；以「输入」「输出」「打印」开头（或者直接写着
- * input( / print(）的是输入输出框；其余是处理框。认出来就换成标准形状、补上种类。靠字猜的：「a = 输入」会被当成处理框。
- * 数据不动，只改显示。
- */
-
-const SEMANTIC_CLASS =
-  /^\s*class\s+[\w,-]+\s+(startNode|endNode|startEnd|input|output|process|decision|loop)\s*;?\s*$/m
-
-/** 节点的开口和对应的收口，长的在前（`((` 要先于 `(` 认） */
-const SHAPES: [string, string][] = [
-  ["((", "))"],
-  ["([", "])"],
-  ["[[", "]]"],
-  ["[(", ")]"],
-  ["{{", "}}"],
-  ["[/", "/]"],
-  ["[\\", "\\]"],
-  ["[", "]"],
-  ["(", ")"],
-  ["{", "}"],
-]
-
-/** 这些开头的行不是节点：声明、分组、样式 */
-const SKIP_LINE = /^\s*(graph|flowchart|subgraph|end\s*$|class|classDef|style|linkStyle|click|%%)/
-
-const START = /^(开始|start)$/i
-const END = /^(结束|end)$/i
-const INPUT = /^(输入|读入|读取|input)/i
-const OUTPUT = /^(输出|打印|显示|print|output)/i
-
-type Kind = "startNode" | "endNode" | "input" | "output" | "process" | "decision"
-
-function plain(body: string) {
-  const text = body.trim()
-  return text.startsWith('"') && text.endsWith('"') && text.length >= 2 ? text.slice(1, -1) : text
-}
-
-function kindOf(open: string, text: string): Kind {
-  const word = text.replace(/<br\s*\/?>/gi, " ").trim()
-  if (START.test(word)) return "startNode"
-  if (END.test(word)) return "endNode"
-  if (open === "{" || open === "{{") return "decision"
-  // 有老师直接写代码：「a = float(input())」是读数据
-  if (INPUT.test(word) || /\binput\s*\(/.test(word)) return "input"
-  if (OUTPUT.test(word)) return "output"
-  return "process"
-}
-
-function shaped(kind: Kind, text: string) {
-  const label = `"${text.replace(/"/g, "#quot;")}"`
-  if (kind === "startNode" || kind === "endNode") return `([${label}])`
-  if (kind === "decision") return `{${label}}`
-  if (kind === "input" || kind === "output") return `[/${label}/]`
-  return `[${label}]`
-}
-
-/** 从 start 起找收口，引号里的不算 */
-function closeAt(line: string, start: number, close: string) {
-  let quoted = false
-  for (let i = start; i < line.length; i++) {
-    if (line[i] === '"') quoted = !quoted
-    else if (!quoted && line.startsWith(close, i)) return i
-  }
-  return -1
-}
-
-function rewriteLine(line: string, kinds: Map<string, Kind>) {
-  let out = ""
-  let i = 0
-  while (i < line.length) {
-    const id = /^[A-Za-z_][\w-]*/.exec(line.slice(i))
-    const prev = i > 0 ? line[i - 1]! : " "
-    if (!id || /[\w-]/.test(prev)) {
-      out += line[i]
-      i++
-      continue
-    }
-    const after = i + id[0].length
-    const shape = SHAPES.find(([open]) => line.startsWith(open, after))
-    const end = shape ? closeAt(line, after + shape[0].length, shape[1]) : -1
-    if (!shape || end < 0) {
-      out += id[0]
-      i = after
-      continue
-    }
-    const text = plain(line.slice(after + shape[0].length, end))
-    const kind = kindOf(shape[0], text)
-    kinds.set(id[0], kind)
-    out += id[0] + shaped(kind, text)
-    i = end + shape[1].length
-  }
-  return out
-}
-
-export function normalizeLegacyFlowchart(code: string) {
-  if (!/^\s*(graph|flowchart)\b/.test(code) || SEMANTIC_CLASS.test(code) || code.includes(":::"))
-    return code
-  const kinds = new Map<string, Kind>()
-  const lines = code
-    .split("\n")
-    .map((line) => (SKIP_LINE.test(line) ? line : rewriteLine(line, kinds)))
-  if (!kinds.size) return code
-  return [...lines, "", ...[...kinds].map(([id, kind]) => `    class ${id} ${kind}`)].join("\n")
-}