レビュー後の改良コードを追加

Author: colorbox

1/4.cpp

@@ -0,0 +1,15 @@
+class Solution {
+public:
+    vector<int> twoSum(vector<int>& nums, int target) {
+        map<int, int> numMap;
+        for(int index = 0; index < nums.size(); index++){
+            int numToFind = target - nums[index];
+            if(numMap.find(numToFind) != numMap.end()){
+                return { index, numMap[numToFind] };
+            }
+            numMap[nums[index]] = index;
+        }
+
+        return {};
+    }
+};