diff --git a/2202/220209.cpp b/2202/220209.cpp
new file mode 100644
index 0000000..0181f64
--- /dev/null
+++ b/2202/220209.cpp
@@ -0,0 +1,29 @@
+#include <vector>
+#include <unordered_map>
+#include <iostream>
+
+class Solution {
+public:
+	static int findPairs(const std::vector<int>& nums, int k) {
+		std::unordered_map<int, int> m;
+		for (int i : nums) {
+			++m[i];
+		}
+
+		int ret = 0;
+		for (auto const& pii : m) {
+			if ((k && m.count(pii.first + k) && m[pii.first + k]) || (!k && pii.second > 1)) {
+				++ret;
+			}
+		}
+		return ret;
+	}
+};
+
+int main() {
+	std::cout << Solution::findPairs({3,1,4,1,5},2);
+	std::cout << Solution::findPairs({1,2,3,4,5},1);
+	std::cout << Solution::findPairs({1,3,1,5,4},0);
+	std::cout << Solution::findPairs({1,2,4,4,3,3,0,9,2,3},3);
+	return 0;
+}
diff --git a/2202/CMakeLists.txt b/2202/CMakeLists.txt
index bb4e559..cdae31b 100644
--- a/2202/CMakeLists.txt
+++ b/2202/CMakeLists.txt
@@ -3,4 +3,4 @@ PROJECT(2202)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2202 220208-CN.cpp)
+ADD_EXECUTABLE(2202 220209.cpp)