Myers Diff 与 LCS 算法7 分钟阅读最后更新于
文本与代码对比算法：Myers Diff 与 LCS 核心原理解析
探索代码差异对比的数学基础，灵活切换分栏与合并视图，安全审查敏感代码。
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核心要点
- Myers 算法以 O(ND) 复杂度找到两段文本之间的最短编辑路径。
- 字符级二次对比能够精确标出修改行内部的具体变动字符。
- 分栏视图适合结构化审查，合并视图与 Git 补丁格式完全一致。
- 纯本地执行可确保企业私有代码绝不会被第三方服务器记录。
100% In-Browser & Local Execution
比对代码与文本内容差异
精准高亮行级与单词级改动，支持语法高亮与即时编辑变更检测。
- Myers Diff algorithm
- Split & unified views
- Character-level highlighting
- Whitespace toggle
01.The Myers Diff Algorithm & Shortest Edit Script
Published by Eugene W. Myers in 1986, the Myers Diff algorithm finds the minimum number of insertions and deletions (the Shortest Edit Script) required to transform string A into string B. By modeling text comparison as a directed acyclic graph (edit graph) on a 2D grid, the algorithm executes an O(ND) search where N is the total length and D is the edit distance.
02.Split Side-by-Side vs. Unified Diff Visualization
Split view places original and modified files in parallel columns, synchronizing scroll positions for structural comparisons. Unified view interleaves additions (+) and deletions (-) in a single column, which is the standard format used by Git patches (git diff).
How to Compare Code and Text Revisions
Step-by-step instructions to inspect code diffs.
1
Paste Original Text
Paste the original source code or text into the left editor pane.
2
Paste Modified Text
Paste the updated revision into the right editor pane.
3
Toggle Diff View
Switch between Split (side-by-side) and Unified view modes depending on your preference.
4
Review Character Highlights
Inspect colored red (deleted) and green (added) inline highlights.
Frequently Asked Questions
No. The Myers diff algorithm executes 100% locally in your browser memory.