New

Recursion/P29_22_Ackermann.cpp

@@ -1,6 +1,21 @@
 #include <iostream>
+#include <cmath>
 using namespace std;
-int main(){
 
+int ack(int i, int j){
+	if(i == 1 && j >= 1)
+		return pow(2,j);
+	if(i >=2 && j == 1)
+		return ack(i - 1, 2);
+	if(i >= 2 && j >= 2)
+		return ack(i - 1, ack(i, j - 1));
+	return 0;
+}
+
+int main(){
+	cout << "1,2: " << ack(1,2) << endl;
+	cout << "2,1: " << ack(2,1) << endl;
+	cout << "2,2: " << ack(2,2) << endl;
+	cout << "1,3: " << ack(1,3) << endl; 
 	return 0;
 }

Recursion/P29_23_GCD.cpp

@@ -0,0 +1 @@
+#include <iostream>