diff --git a/2112/211227.cpp b/2112/211227.cpp
new file mode 100644
index 0000000..4913ebd
--- /dev/null
+++ b/2112/211227.cpp
@@ -0,0 +1,14 @@
+#include <iostream>
+
+class Solution {
+public:
+    static int findComplement(int num) {
+        unsigned t = 1;
+		for (int x = num; x; t <<= 1, x >>= 1);
+		return (t - 1) ^ num;
+    }
+};
+
+int main() {
+	std::printf("%d\n", Solution::findComplement(9));
+}
\ No newline at end of file
diff --git a/2112/CMakeLists.txt b/2112/CMakeLists.txt
index d05e6fd..c0b2453 100644
--- a/2112/CMakeLists.txt
+++ b/2112/CMakeLists.txt
@@ -3,4 +3,4 @@ PROJECT(2112)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2112 211226.cpp)
\ No newline at end of file
+ADD_EXECUTABLE(2112 211227.cpp)
\ No newline at end of file