滑动窗口
public int minSubArrayLen(int target, int[] nums) {
int left = 0;
int sum = 0;
int result = Integer.MAX_VALUE;
for (int right = 0; right < nums.length; right++) {
sum += nums[right];
while (sum >= target) {
result = Math.min(result, right - left + 1);
sum -= nums[left++];
}
}
return result == Integer.MAX_VALUE ? 0 : result;
}