diff --git a/136_single_number/main.cpp b/136_single_number/main.cpp
new file mode 100644
index 0000000..c183a7f
--- /dev/null
+++ b/136_single_number/main.cpp
@@ -0,0 +1,13 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+class Solution {
+   public:
+    int singleNumber(vector<int>& nums) {
+        int result = 0;
+        for (auto num : nums) {
+            result ^= num;
+        }
+        return result;
+    }
+};