GFG | Count Subarray with k odds | Sliding Window | O(n) Solution | Java
Автор: Code Kage
Загружено: 2026-01-07
Просмотров: 202
In this video, we solve the “Count Subarray with K Odds” problem using an efficient Sliding Window approach.
You are given an array of positive integers and an integer k. The task is to count the number of contiguous subarrays that contain exactly k odd numbers.
Instead of checking all subarrays (which would be slow), we use a smart mathematical trick:
Subarrays with exactly k odds = At most k odds − At most (k − 1) odds
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