func minSubArrayLen(s int, nums []int) int {
	sum, minLen := 0, len(nums)
	for slow, fast := 0, 0; fast < len(nums); fast++ {
		sum += nums[fast]
		for ; s <= sum-nums[slow] && slow < fast; slow++ {
			sum -= nums[slow]
		}
		if s <= sum && fast-slow < minLen {
			minLen = fast - slow + 1
		}
	}
	if s <= sum {
		return minLen
	}
	return 0
}