diff --git a/cpp/2203/220331-CN.cpp b/cpp/2203/220331-CN.cpp
new file mode 100644
index 0000000..fb57adc
--- /dev/null
+++ b/cpp/2203/220331-CN.cpp
@@ -0,0 +1,39 @@
+#include <vector>
+
+template<int N>
+class AnswerTable {
+public:
+	bool isNotAnswer[N]{};
+
+	explicit constexpr AnswerTable() {
+		for (int i = 1; i < N; ++i) {
+			for (int j = i; j; j /= 10) {
+				if (!(j % 10) || i % (j % 10)) {
+					isNotAnswer[i] = true;
+					break;
+				}
+			}
+		}
+	}
+};
+
+/**
+ * 728. Self Dividing Numbers
+ * A self-dividing number is a number that is divisible by every digit it contains.
+ * - For example, 128 is a self-dividing number because 128 % 1 == 0, 128 % 2 == 0, and 128 % 8 == 0.
+ * A self-dividing number is not allowed to contain the digit zero.
+ * Given two integers left and right, return a list of all the self-dividing numbers in the range [left, right].
+ */
+
+class Solution {
+private:
+	static constexpr AnswerTable<10001> ans = AnswerTable<10001>();
+public:
+	static std::vector<int> selfDividingNumbers(int left, int right) {
+		std::vector<int> ret;
+		for (int i = left; i <= right; ++i)
+			if (!ans.isNotAnswer[i])
+				ret.push_back(i);
+		return ret;
+	}
+};
diff --git a/cpp/2203/CMakeLists.txt b/cpp/2203/CMakeLists.txt
index 0e6e95b..fa4be17 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 220330-CN.cpp)
+ADD_EXECUTABLE(2203 220331-CN.cpp)