Prefix Sum
Subarray Sum Divisible by K
Given an array of integers and an integer K, find the number of subarrays which are divisible by K.
Input: [3,1,2,5,1], 3
Output: 6
Explanation: the six subarrays are[3], [3,1,2], [1,2],[5,1], [3,1,2,5,1,], [1,2,5,1]
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>>> a = [1, 2, 3]
>>> a[-1]
3