LeetCode 409 | Longest Palindrome | Python Frequency Pairs + Center Trick | AlgoYogi

Welcome to AlgoYogi! 🚀 Start Your Smart Coding Prep at 👉 https://algoyogi.io We solve LeetCode 409: Longest Palindrome using Python and a simple counting idea. Build the longest palindrome by taking all even counts plus as many pairs as possible from odd counts, and optionally one single center if any odd exists. 👉 Problem Link: https://leetcode.com/problems/longest-palindrome/description/ --- ### ⏱ Timestamps 0:00 Introduction 0:20 Problem Statement 1:50 Approach (Frequency Pairs + Optional Center) 9:30 Python Code Walkthrough 13:00 Time and Space Complexity --- ### 💡 Why Watch? - Clean counting method with linear time - Key insight: use pairs from each character and allow one center - Interview classic with easy correctness proof #LeetCode #LongestPalindrome #Python #AlgoYogi #HashMap #Greedy