包AC,我老师教的，不对去找我老师

#include<bits/stdc++.h>
using namespace std;
void move(int n,char a,char b,char c){
	if(n==0){
		return;
	}
	move(n-1,a,c,b);
	cout<<"Move "<<a<<" to "<<c<<endl;
	move(n-1,b,a,c);
}
int main(){
	int n,res=1;
	cin>>n;
	for(int i=1;i<=n;i++){
		res*=2;
	}
	cout<<res-1<<endl;
	move(n,'A','B','C');
	return 0;
}