The Algorithm Behind Every Diff: Understanding git diff and LCS

Git diff appears trivial to developers—red lines, green lines—but it leverages sophisticated algorithms like LCS (Longest Common Subsequence) and Myers diff, fundamental computer science concepts rarely discussed. Understanding these algorithms reveals why naive line-by-line comparisons fail for real-world code changes and how Git intelligently identifies true modifications. For software engineers and students, this practical exploration connects theoretical DSA knowledge to tools used hundreds of times daily, bridging the gap between algorithms and reality.