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update: 添加问题“3474.字典序最小的生成字符串”的代码和题解#1477

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LetMeFly666 merged 7 commits intomasterfrom
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Apr 1, 2026
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update: 添加问题“3474.字典序最小的生成字符串”的代码和题解#1477
LetMeFly666 merged 7 commits intomasterfrom
3474

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By newSolution.py using GH on Windows | close: #1475

input: TFTF ab
output: ""
should: ababa
input: FT aghbdfhf
output: baghbdfhf
should: aaghbdfhf
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>
@LetMeFly666 LetMeFly666 requested a review from Tisfy as a code owner April 1, 2026 14:10
@LetMeFly666 LetMeFly666 added the 题解 Solution label Apr 1, 2026
Copilot AI review requested due to automatic review settings April 1, 2026 14:10
@LetMeFly666 LetMeFly666 self-assigned this Apr 1, 2026
@LetMeFly666 LetMeFly666 added the under merge pr准备就绪 请做merge前最后的检查 label Apr 1, 2026
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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.cpp implementing 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.

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PR 概要

本 PR 包含以下变更:

  1. 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
  2. 更新 README 索引表
  3. 新增 Solutions/Other-Accumulation-SomeTips.md 中 macOS 解码二维码的技巧笔记
  4. 修复 SomeTips.md 中一处文案笔误("让由AI" → "由AI")
  5. 清理 误提交的临时文件(diff.txtmusic-*.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)

  1. 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。

  2. 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 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。

  3. 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。

  4. 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

@LetMeFly666 LetMeFly666 removed the under merge pr准备就绪 请做merge前最后的检查 label Apr 1, 2026
@LetMeFly666 LetMeFly666 merged commit 85efcf7 into master Apr 1, 2026
5 checks passed
@LetMeFly666 LetMeFly666 deleted the 3474 branch April 1, 2026 14:53
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[newSolution]Who can add 1 more problem of LeetCode 3474

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