diff --git a/cpp/2204/220402.cpp b/cpp/2204/220402.cpp
new file mode 100644
index 0000000..dc00933
--- /dev/null
+++ b/cpp/2204/220402.cpp
@@ -0,0 +1,24 @@
+#include <string>
+
+/**
+ * 680. Valid Palindrome II
+ * Given a string s, return true if the s can be palindrome after deleting at most one character from it.
+ */
+
+class Solution {
+private:
+	static bool isPalindrome(const std::string& basicString, int i, int j) {
+		for (; i < j; ++i, --j)
+			if (basicString[i] != basicString[j])
+				return false;
+		return true;
+	}
+public:
+	static bool validPalindrome(const std::string& s) {
+		for (int i = 0, j = s.size() - 1; i < j; ++i, --j)
+			if (s[i] != s[j])
+				return isPalindrome(s, i + 1, j) || isPalindrome(s, i, j - 1);
+		return true;
+	}
+};
+
diff --git a/cpp/2204/CMakeLists.txt b/cpp/2204/CMakeLists.txt
index 67a70c6..810b8e8 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 220401.cpp)
+ADD_EXECUTABLE(2204 220402.cpp)