这是黄题？打巳我都不信

#include<bits/stdc++.h>
using namespace std;
void hnt(int n,char start,char sup,char end){
if(n==1) cout<<start<<" --"<<n<<"--> "<<end<<endl;
else{
hnt(n-1,start,end,sup);
cout<<start<<" --"<<n<<"--> "<<end<<endl;
hnt(n-1,sup,start,end);
}
}
int main()
{
int n;
cin>>n;
hnt(n,'A','B','C');
return 0;
}