Diff Algorithms Explained: Myers, Patience, Histogram
How text diff algorithms work: Myers diff, Patience diff, and Histogram diff. When each algorithm produces better output for code vs prose.
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Tags: text, developer-tools, programming
Diff Algorithms: Myers, Patience, and Histogram Compared When you run , the output looks simple: green lines added, red lines removed. But behind that output is a carefully designed algorithm choosing the most readable way to present what changed. Not all diff algorithms produce the same output — and the differences matter when you are reviewing code. This guide explains the three diff algorithms you are most likely to encounter: Myers (the git default), Patience (better for refactored code), and Histogram (Git's improved Patience). --- The Core Problem: Shortest Edit Script Given two sequences A and B, find the minimum number of insertions and deletions needed to transform A into B. This is the Shortest Edit Script (SES) problem, equivalent to finding the Longest Common Subsequence…
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