0209.py

class Solution:
    def minSubArrayLen(self, s, nums):
        """
        :type s: int
        :type nums: List[int]
        :rtype: int
        """
        l = 0
        r = 0
        sum_all = 0
        nums_len = len(nums)
        minLength = nums_len + 1
        while l < nums_len:
            if r < nums_len and sum_all < s:
                sum_all += nums[r]
                r += 1
            else:
                sum_all -= nums[l]
                l += 1
            
            if sum_all >= s:
                minLength = min(minLength, r - l + 1)

        if minLength == nums_len + 1:
            return 0
        
        return minLength
        

if __name__ == "__main__":
    arr = []
    target = 7
    print(Solution().minSubArrayLen(target, arr))