2 sum using Hash Table.cpp

class Solution {
public:
    vector<int> twoSum(vector<int>& nums, int target) {
         unordered_map<int, int> hash; /
        vector<int> result;
        for (int i = 0; i < nums.size(); i++)
            if (hash.count(target - nums[i]))
            {
                result.push_back(hash[target - nums[i]]); 
                result.push_back(i);
                return result;
            }
            else 
                hash[nums[i]] = i;
        return result;
    }
};