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public int minSubArrayLen(int s, int[] nums) {
if(s <= 0 || nums == null)
throw new IllegalArgumentException("Illigal Arguments");
int l = 0 , r = -1;
int sum = 0;
int res = nums.length + 1;
while(l < nums.length){
if(r + 1 < nums.length && sum < s)
sum += nums[++r];
else
sum -= nums[l++];
if(sum >= s)
res = Math.min(res, r - l + 1);
}
return res == nums.length + 1 ? 0 : res;
}
