class Solution {
public:
    vector<int> twoSum(vector<int>& numbers, int target) {
        vector<int> res;
        int n = numbers.size();
        for (int l = 0, r = n - 1; l < r; l ++ )
        {
            while (numbers[l] + numbers[r] > target) r -- ;
            if (numbers[l] + numbers[r] == target)
            {
                res.push_back(l + 1), res.push_back(r + 1);
                return res;
            }
        }
        return res;
    }
};