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class Solution {
public:
    vector<int> twoSum(vector<int>& nums, int target) {
        int l = 0, r = nums.size() - 1;
        unordered_map<int, int> hash;
        vector<int> result;
        for(int i = 0; i < nums.size(); i++) {
            int t = target - nums[i];
            if (hash.find(t) != hash.end()) {
                result.push_back(hash[t]);
                result.push_back(i);
                return result;
            }
            hash[nums[i]] = i;
        }
        return result;       
    }
};