diff --git a/1. Two Sum.cpp b/1. Two Sum.cpp
new file mode 100644
index 0000000..f2480c1
--- /dev/null
+++ b/1. Two Sum.cpp	
@@ -0,0 +1,20 @@
+#include <vector>
+#include <unordered_map>
+
+class Solution {
+public:
+    std::vector<int> twoSum(std::vector<int>& nums, int target) {
+        std::unordered_map<int, int> numMap;
+        int n = nums.size();
+
+        for (int i = 0; i < n; ++i) {
+            int complement = target - nums[i];
+            if (numMap.count(complement)) {
+                return {numMap[complement], i};
+            }
+            numMap[nums[i]] = i;
+        }
+
+        return {}; // Should not happen based on problem constraints
+    }
+};
\ No newline at end of file