diff --git a/Algorithm/DP-DynamicProgramming/P1025 [NOIP 2001 提高组] 数的划分.cpp b/Algorithm/DP-DynamicProgramming/P1025 [NOIP 2001 提高组] 数的划分.cpp
new file mode 100644
index 0000000..e69de29
diff --git a/Object-Oriented-Programming/嵌套类.cpp b/Object-Oriented-Programming/嵌套类.cpp
new file mode 100644
index 0000000..a4b5158
--- /dev/null
+++ b/Object-Oriented-Programming/嵌套类.cpp
@@ -0,0 +1,38 @@
+#include <iostream>
+using namespace std;
+class Engine{
+public:
+	int layer1;
+	class WaterTank{
+	public:
+		int layer3;
+		class Water{
+		public:
+			int layer5;
+		};
+	};
+	private:
+		int layer8;
+		class Tank{
+		public:
+			int layer9;
+		};
+	};
+private:
+	int layer2;
+	class EngineRope{
+	public:
+		int layer6;
+		class Rope{
+		public:
+			int layer7;
+		};
+	};
+	
+};
+
+int main(){
+	Engine A;
+	cout << A.layer1 << A.WaterTank.layer3 << A.WaterTank.Water.layer5
+	return 0;
+}