# Given an array of integers nums and an integer k, # return the total number of continuous subarrays whose sum equals k. # - Instead of checking all subarrays (O(n^2)), we use prefix sums. # - If ...
# 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.
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