和为s的两个数字_42

public ArrayList<Integer> FindNumbersWithSum(int [] array, int sum) {
        ArrayList<Integer> res=new ArrayList<>();
        if (array==null||array.length<2){
            return res;
        }

        int low=0,high=array.length-1;
        while (low<high){
            if (array[low]+array[high]>sum){
                high--;
            }else if (array[low]+array[high]<sum){
                low++;
            }else {
                res.add(array[low]);
                res.add(array[high]);
                return res;
            }
        }
        return res;
    }