Given an integer array nums and an integer k, return the number of non empty contiguous subarrays of nums whose sum is divisible by k.

Constraints:

• $1 \leq$ nums.length $\leq 3 * 10^4$

• $-10^4 \leq$ nums[i] $\leq 10^4$

• $2 \leq$ k $\leq 10^4$

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