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Count Number of Nice Subarrays
Given an array of integers nums and an integer k.
Given an array of integers nums and an integer k. A continuous subarray is called nice if there are k odd numbers on it.
Return the number of nice sub-arrays.
Example 1
Input: nums = [1,1,2,1,1], k = 3
Output: 2
Explanation: The only sub-arrays with 3 odd numbers are [1,1,2,1] and [1,2,1,1].
Example 2
Input: nums = [2,4,6], k = 1
Output: 0
Explanation: There are no odd numbers in the array.
Example 3
Input: nums = [2,2,2,1,2,2,1,2,2,2], k = 2
Output: 16
Constraints
- 1 <= nums.length <= 50000
- 1 <= nums[i] <= 10^5
- 1 <= k <= nums.length
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