diff --git a/1_two_sum/main.cpp b/1_two_sum/main.cpp
new file mode 100644
index 0000000..7df0740
--- /dev/null
+++ b/1_two_sum/main.cpp
@@ -0,0 +1,34 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+class Solution {
+public:
+    vector<int> twoSum(vector<int>& nums, int target) {
+        unordered_map<int, vector<int>> mp;
+        for (int i = 0; i < nums.size(); i++) {
+            if (mp.find(nums[i]) == mp.end()) {
+                mp[nums[i]] = vector<int>();
+            }
+            mp[nums[i]].emplace_back(i);
+        }
+
+        for (auto &[x, y] : mp) {
+        }
+
+        sort(nums.begin(), nums.end());
+
+        for (int i = nums.size() - 1; i >= 0; i--) {
+            int x = nums[i];
+            int need = target - x;
+
+            if (binary_search(nums.begin(), nums.begin() + i, need)) {
+                if (x == need) {
+                    return {mp[x][0], mp[need][1]};
+                }
+                return {mp[x][0], mp[need][0]};
+            }
+        }
+
+        return {};
+    }
+};