Day 20: Longest Repeating Character Replacement (LeetCode 424) — Sliding Window | O(n) скачать в хорошем качестве

Day 20: Longest Repeating Character Replacement (LeetCode 424) — Sliding Window | O(n)

🎯 Day 20 of My LeetCode Journey | Longest Repeating Character Replacement (LeetCode 424) In this video, I solve LeetCode Problem #424 — Longest Repeating Character Replacement using a Sliding Window technique with frequency tracking for an optimal O(n) solution. The task is to find the length of the longest substring where you can replace at most k characters to make all characters in the substring identical. 🔗 Problem Link: https://leetcode.com/problems/longest... 📌 PROBLEM SUMMARY: Given a string s and an integer k, return the length of the longest substring you can get after performing at most k character replacements so that the substring consists of only one repeated character. ✅ Example 1: Input: s = "ABAB", k = 2 Output: 4 Explanation: Replace two ‘A’s or two ‘B’s to make "AAAA" or "BBBB". ✅ Example 2: Input: s = "AABABBA", k = 1 Output: 4 Explanation: Replace the middle ‘A’ with ‘B’ → "AABBBBA", the longest repeating substring is "BBBB". 💡 KEY CONCEPTS: ✅ Sliding Window ✅ Frequency Map / Char Count ✅ Max Frequency tracking ✅ Two-pointer optimization 📊 COMPLEXITY: • Time: O(n) • Space: O(1) — constant alphabet size 🎓 DIFFICULTY: Medium 🏷️ TOPICS: String, Sliding Window, Two-Pointer 🔔 SUBSCRIBE for daily LeetCode solutions and coding challenges! 👍 LIKE if you enjoyed the approach! 💬 COMMENT your variations or questions below! 📚 MY LEETCODE JOURNEY PLAYLIST:    • Leetcode   🤝 CONNECT WITH ME: • GitHub: https://github.com/ashwinikemshetty • LinkedIn:   / ashwinikemshetty   #LeetCode #LeetCode424 #SlidingWindow #String #Day20 #LongestRepeatingCharacterReplacement #100DaysOfCode #DSA #Algorithms