LeetCode 1758 | Minimum Changes to Make Alternating Binary String | Python | AlgoYogi

Welcome to AlgoYogi! 🚀 Start Your Smart Coding Prep at 👉 https://algoyogi.io We solve LeetCode 1758: Minimum Changes to Make Alternating Binary String using a one-pass mismatch counter. Goal: given a binary string s, return the minimum number of flips to make it alternating. Approach: - Compare s against two target patterns: • Pattern A: starts with '0' → "010101..." • Pattern B: starts with '1' → "101010..." - In one pass, count mismatches for both patterns. - Answer = min(mismatches for A, mismatches for B). 👉 Problem Link: https://leetcode.com/problems/minimum-changes-to-make-alternating-binary-string/ --- ### ⏱ Timestamps 0:00 Introduction 0:20 Problem Statement 1:30 One-Pass Dual Pattern Check 12:00 Python Code Walkthrough 17:00 Time & Space Complexity --- ### 💡 Why Watch? - Elegant O(n) scan with O(1) space - Works directly on the string without building new arrays - Interview-friendly trick: evaluate both alternating targets at once #LeetCode #AlternatingBinaryString #Python #AlgoYogi #String #Greedy