DSA in Python - Longest Common Subsequence (LCS) | 5 DP Variations + Space Optimization | Part 208

Published: 22 August 2025
on channel: Code and Debug
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📘 Welcome to Part 208 of Code & Debug’s DSA in Python Course!

In this session, we decode the classic string DP problem: Longest Common Subsequence (LCS). Given two strings, the task is to find the length of their LCS—subsequence order preserved, not necessarily contiguous. We’ll build intuition from recursion and upgrade through memoization, clean 1-based indexing DP, tabulation, and an interview-favorite space-optimized solution.

🔗 LeetCode Problem – Longest Common Subsequence:
https://leetcode.com/problems/longest...

🔗 In-Depth Article with All Approaches & Code:
https://codeanddebug.in/blog/longest-...

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https://docs.google.com/spreadsheets/...

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