class Solution {
public:
    vector<int> twoSum(vector<int> &numbers, int target) {
        vector<int> result;
        unordered_multimap<int, int> hashmap;
        for(int i=0; i<numbers.size(); i++){
            if(hashmap.find(target-numbers[i])!=hashmap.end()){
                result.push_back(hashmap.find(target-numbers[i])->second);
                result.push_back(i+1);
                return result;
            }
            hashmap.insert({numbers[i], i+1});
        }
    }
};