Leetcode 3721 | Longest Balanced Subarray II скачать в хорошем качестве

Leetcode 3721 | Longest Balanced Subarray II

This Hard problem looks like sliding window… but it’s NOT. In LeetCode 3721 – Longest Balanced Subarray II, we must find the longest subarray where: Distinct even numbers Distinct odd numbers are equal. The catch? We’re dealing with distinct counts, not frequencies — which completely breaks the normal two-pointer approach. In this video, you’ll learn: • Why sliding window fails • The prefix-state transformation trick • How to dynamically remove old contributions • How Lazy Segment Tree makes this possible • Full Python implementation (O(n log n)) This is advanced state-management thinking required for Hard problems and top-tier interviews. If you're preparing for FAANG / GATE / competitive programming — this pattern is powerful.