diff --git a/cpp/2204/220417.cpp b/cpp/2204/220417.cpp
new file mode 100644
index 0000000..6baade9
--- /dev/null
+++ b/cpp/2204/220417.cpp
@@ -0,0 +1,35 @@
+#include <functional>
+
+struct TreeNode {
+	int val;
+	TreeNode* left;
+	TreeNode* right;
+
+	explicit TreeNode(int x = 0, TreeNode* l = nullptr, TreeNode* r = nullptr) : val(x), left(l), right(r) {}
+};
+
+class Solution {
+public:
+	static TreeNode* increasingBST(TreeNode* root, TreeNode* greater = nullptr) {
+		if (!root)
+			return nullptr;
+		root->right = root->right ? increasingBST(root->right, greater) : greater;
+		if (!root->left)
+			return root;
+		auto* rl = root->left;
+		root->left = nullptr;
+		return increasingBST(rl, root);
+	}
+};
+
+int main() {
+	auto* root = new TreeNode(
+		5,
+		new TreeNode(3, new TreeNode(2, new TreeNode(1)), new TreeNode(4)),
+		new TreeNode(6, nullptr, new TreeNode(8, new TreeNode(7), new TreeNode(9)))
+	);
+
+	auto* newRoot = Solution::increasingBST(root);
+
+	return 0;
+}
diff --git a/cpp/2204/CMakeLists.txt b/cpp/2204/CMakeLists.txt
index a6b2cab..36bd6e6 100644
--- a/cpp/2204/CMakeLists.txt
+++ b/cpp/2204/CMakeLists.txt
@@ -3,4 +3,4 @@ PROJECT(2204)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2204 220416-CN.cpp)
+ADD_EXECUTABLE(2204 220417.cpp)