Given an array of integers nums and an integer k, find the maximum sum of any contiguous subarray of size k.
nums = array of integers, k = window size
Maximum sum of any subarray of length k
Example 1:
Input:
nums = [2,1,5,1,3,2] k = 3
Output:
9
Explanation:
Subarray [5,1,3] has the maximum sum 9.