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