错误代码： #include<bits/stdc++.h> using namespace std; int n,cnt=0; void hnt(int n,char a,char b,char c){ if(n==1){ cout<<a<<"->"<<n<<"->"<<c<<endl; return ; } hnt(n-1,a,b,c); cout<<a<<"->"<<n<<"->"<<c<<endl; hnt(n-1,c,a,b); } int main() { cin>>n; hnt(n,'a','b','c'); return 0; }