add #include statements

fishercoder1534 · fishercoder1534 · commit 39bf81e48b7d · 2019-03-23T08:22:24.000-07:00
diff --git a/cpp/_1.cpp b/cpp/_1.cpp
@@ -13,6 +13,11 @@ Because nums[0] + nums[1] = 2 + 7 = 9,
 return [0, 1].
 
 */
+
+#include <vector>
+#include <unordered_map>
+using namespace std;
+
 class Solution {
 public:
     vector<int> twoSum(vector<int>& nums, int target) {
