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#244 · #1248 · Count Number of Nice Subarrays(统计「优美子数组」数目)

📌 Problem Statement & Constraints

Given an array of integers nums and an integer k, return the number of nice subarrays: contiguous subarrays with exactly k odd numbers. Constraints: 1 <= nums.length <= 5 * 10^4, 1 <= nums[i] <= 10^5, 1 <= k <= nums.length.
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