Update two-sum.cpp

Author: kamyu104

C++/two-sum.cpp

@@ -4,15 +4,13 @@
 class Solution {
 public:
     vector<int> twoSum(vector<int>& nums, int target) {
-        vector<int> res;
         unordered_map<int, int> lookup;
         for (int i = 0; i < nums.size(); ++i) {
             if (lookup.count(target - nums[i])) {
-                res = {lookup[target - nums[i]], i};
-                break;
+                return {lookup[target - nums[i]], i};
             }
             lookup[nums[i]] = i;
         }
-        return res;
+        return {};
     }
 };