函数运用 + string

#include<iostream>

using namespace std;

int n;

void tower(int cnt,char x,char y,char z){
	if(cnt==1){
		cout<<x<<" -> "<<z<<endl;
	}
	else{
		tower(cnt-1,x,z,y);
		cout<<x<<" -> "<<z<<endl;
		tower(cnt-1,y,x,z);
	}
	return ;
}

int main(){
	cin>>n;
	tower(n,'A','B','C');
	return 0;
}