Given an integer array nums and an integer k, return the number of contiguous subarrays of nums that contain exactly k odd numbers.

Note: A subarray is a contiguous sequence of elements within nums.

Constraints:

• $1 \leq$ nums.length $\leq 50000$

• $1 \leq$ nums[i] $\leq 10^5$

• $1 \leq$ k $\leq$ nums.length

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