diff --git a/2201/220130-CN.cpp b/2201/220130-CN.cpp
new file mode 100644
index 0000000..75c88fa
--- /dev/null
+++ b/2201/220130-CN.cpp
@@ -0,0 +1,31 @@
+#include <string>
+#include <vector>
+#include <unordered_map>
+
+class Solution {
+private:
+	static std::unordered_map<std::string, int> breakWords(const std::string& s) {
+		std::unordered_map<std::string, int> m;
+		for (int pos = 0; pos >= 0; (pos = s.find_first_of(' ', pos)), (pos = (pos == -1 ? -1 : pos + 1))) {
+			++m[s.substr(pos, s.find_first_of(' ', pos) - pos)];
+		}
+		return m;
+	};
+public:
+	static std::vector<std::string> uncommonFromSentences(const std::string& s1, const std::string& s2) {
+		auto m1 = breakWords(s1), m2 = breakWords(s2);
+		std::vector<std::string> ret;
+		for (const auto& i : m1)
+			if (i.second == 1 && !m2.count(i.first))
+				ret.push_back(i.first);
+		for (const auto& i : m2)
+			if (i.second == 1 && !m1.count(i.first))
+				ret.push_back(i.first);
+		return ret;
+	}
+};
+
+int main() {
+	auto ret = Solution::uncommonFromSentences("this apple is sweet", "this apple is sour");
+	return 0;
+}
diff --git a/2201/CMakeLists.txt b/2201/CMakeLists.txt
index bdd82be..a3db28d 100644
--- a/2201/CMakeLists.txt
+++ b/2201/CMakeLists.txt
@@ -3,4 +3,4 @@ PROJECT(2201)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2201 220130.cpp)
+ADD_EXECUTABLE(2201 220130-CN.cpp)