update: 添加问题“3474.字典序最小的生成字符串”的代码和题解#1477
Conversation
input: TFTF ab output: "" should: ababa
input: FT aghbdfhf output: baghbdfhf should: aaghbdfhf
input: big output: big should: big
刚刚是因为修改为b后,b的位置就不能再修改为a了,要同步can_change为false
2026年3月31日 23:42:43
2840: AC.cpp (#1473) cpp - string - AC,26.79%,66.07% cpp - hash - AC,98.21%,100.00% Signed-off-by: LetMeFly666 <Tisfy@qq.com>
There was a problem hiding this comment.
Pull request overview
This PR primarily adds the C++ solution for LeetCode 3474 (“字典序最小的生成字符串”) and registers it in the repository’s main problem index; it also includes some unrelated documentation updates and removes several standalone shell scripts/files.
Changes:
- Add
Codes/3474-lexicographically-smallest-generated-string.cppimplementing the solution for problem 3474. - Add the 3474 entry to the solutions table in
README.md. - Add a macOS QR-code decoding tip section and remove several unrelated music helper scripts / a small diff text file.
Reviewed changes
Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| Solutions/Other-Accumulation-SomeTips.md | Adds a new “macOS 解码二维码” tips section; also fixes a typo in an existing blockquote line. |
| README.md | Adds the problem 3474 row to the main solutions index table. |
| Codes/3474-lexicographically-smallest-generated-string.cpp | Adds the C++ solution implementation for LeetCode 3474 (with local debug harness under _DEBUG). |
| music-04-zip-diff.sh | Deleted script (music zip packaging helper). |
| music-03-diff.sh | Deleted script (music folder comparison helper). |
| music-02-rezip.sh | Deleted script (music rezipping helper). |
| music-01-unzip.sh | Deleted script (music unzip helper). |
| music-00-chat.sh | Deleted chat/instructions scratch file for the above scripts. |
| diff.txt | Deleted small text file. |
💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.
There was a problem hiding this comment.
PR 概要
本 PR 包含以下变更:
- 新增 LeetCode 3474(字典序最小的生成字符串)C++ 题解代码及题解 Markdown 文档
- 更新 README 索引表
- 新增
Solutions/Other-Accumulation-SomeTips.md中 macOS 解码二维码的技巧笔记 - 修复 SomeTips.md 中一处文案笔误("让由AI" → "由AI")
- 清理 误提交的临时文件(
diff.txt、music-*.sh脚本、日文文件名文件等)
代码正确性分析
| 文件 | 变更类型 | 正确性 | 说明 |
|---|---|---|---|
Codes/3474-lexicographically-smallest-generated-string.cpp |
新增 | ✅ 正确 | 贪心+暴力填充,先处理T再处理F,逻辑正确 |
Solutions/LeetCode 3474.字典序最小的生成字符串.md |
新增 | ✅ 正确 | 题解文档结构完整,思路推导清晰 |
README.md |
修改 | ✅ 正确 | 索引行位置、格式正确 |
Solutions/Other-Accumulation-SomeTips.md |
修改 | ✅ 正确 | 二维码解码笔记实用,typo 修复正确 |
| 删除的临时文件 | 删除 | ✅ 良好清理 | 移除了误提交的 music 脚本和测试文件 |
潜在问题与建议
P3 (低优先级)
-
大段调试注释 — C++ 代码中第 10-33 行保留了 24 行思考过程注释块。对于最终提交的题解代码,建议精简或移至题解文档。
-
函数命名 —
can_changed_place_are_all_a实际语义是"可修改位置对应 str2 全为 a 且 不可修改位置已与 str2 匹配",函数名未完整表达后半部分语义。 -
change_last2b中非 'b' 位置未锁定 — 填充'a'的位置未设can_change = false,虽然当前算法下安全('a'是最小值,后续 F 只会保持或改大),但显式锁定更清晰。 -
set_all_a未锁定 — 同理,填充后未锁定。当前安全(因为走此分支时已存在不可修改位置与 str2 不同),但建议显式锁定以防后续维护引入 bug。
总结
| 维度 | 评级 | 说明 |
|---|---|---|
| 正确性 | ⭐⭐⭐⭐⭐ | 算法正确,T/F 分阶段处理、贪心策略合理 |
| 可读性 | ⭐⭐⭐⭐ | 函数拆分清晰,但调试注释块较大 |
| 规范性 | ⭐⭐⭐⭐ | 临时文件清理到位,小问题不影响功能 |
| 文档 | ⭐⭐⭐⭐⭐ | 题解详尽,额外技巧笔记实用 |
合并建议
建议合并 (Approve) — 整体质量高,所有问题均为 P3 非阻塞性建议。
Review by AI Assistant
By newSolution.py using GH on Windows | close: #1475