Two Sum II - Input array is sorted

class Solution {
public:
    vector<int> twoSum(vector<int>& numbers, int target) {
        int x;
        int v;
        int ans, i;
        for (i = 0; i < numbers.size(); i++) {
            x = numbers[i];
            v = target - x;
            if (binary_search(numbers.begin(), numbers.end(), v)) {
                ans = lower_bound(numbers.begin(), numbers.end(), v) - numbers.begin();
                if(ans == i) {
                    continue;
                }
                break;
            }

        }

        vector<int> res;
        res.push_back(i + 1);
        res.push_back(ans + 1);
        sort(res.begin(), res.end());
        return res;
    }
};