Return the length of the shortest, non-empty, contiguous subarray of A with sum at least K. If there is no non-empty subarray with sum at least K, return -1. Example 1: Input: A = [1], K = 1 Output: 1 Example 2: Input: A = [1,2], K = 4 Output: -1 Example 3: Input: A = [2,-1,2], K = 3 Output: 3 Note: 1 <= A.length <= 50000 -10 ^ 5 <= A[i] <= 10 ^ 5 1 <= K <= 10 ^ 9