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class Solution {
public:
    int minSubArrayLen(int s, vector<int>& nums) {
        int len = nums.size();
        if (len == 0) return 0;
        int min = INT_MAX;
        int sum = 0;
        
        int left = 0, right = -1;
        while(right < len) {
            while(sum < s && right < len) {
                sum += nums[++right];
            }
            if (sum >= s) {
                min = min < right - left + 1 ? min : right - left + 1;
                sum -= nums[left++];
            }
        }
        return min > len ? 0 : min;
    }
};