437. Smallest Subarray Sum Target

Given an array of positive integers nums and a positive integer target, return the minimal length of a contiguous subarray of which the sum is greater than or equal to target. If there is no such subarray, return 0.

Example 1:
Input: target = 7, nums = [2,3,1,2,4,3]
Output: 2
Explanation: The subarray [4,3] has the minimal length under the problem constraint.

Example 2:
Input: target = 4, nums = [1,4,4]
Output: 1

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