diff --git a/cpp/2203/220313-CN.cpp b/cpp/2203/220313-CN.cpp
new file mode 100644
index 0000000..4435a81
--- /dev/null
+++ b/cpp/2203/220313-CN.cpp
@@ -0,0 +1,28 @@
+#include <vector>
+#include <iostream>
+
+class Solution {
+public:
+	static bool validUtf8(const std::vector<int>& data) {
+		int state = 0;
+		for (int i : data) {
+			if (state) {
+				if (i < 0x80 || i > 0xBF)
+					return false;
+				--state;
+			} else {
+				if (i < 0x80) continue;
+				for (int j = 0x80; i & j; j >>= 1)
+					++state;
+				if ((!--state) || (state > 3))
+					return false;
+			}
+		}
+		return state == 0;
+	}
+};
+
+int main() {
+	std::cout << Solution::validUtf8({235, 140, 4});
+	return 0;
+}
diff --git a/cpp/2203/CMakeLists.txt b/cpp/2203/CMakeLists.txt
index 9701b8c..fa77a8d 100644
--- a/cpp/2203/CMakeLists.txt
+++ b/cpp/2203/CMakeLists.txt
@@ -3,4 +3,4 @@ PROJECT(2203)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2203 220312-CN.cpp)
+ADD_EXECUTABLE(2203 220313-CN.cpp)