Update Two Sum

Runtime: 40 ms, faster than 11.83% of C++ online submissions for Two Sum.
Memory Usage: 8.9 MB, less than 55.50% of C++ online submissions for Two Sum.

Author: adryxta

Two Sum

@@ -8,7 +8,7 @@ public:
                 if(nums[i]+nums[j]==target){
                     x.push_back(i);
                     x.push_back(j);
-                }
+                    break;
             }
         }
         return x;