问题标题: 酷町堂：5062

为什么会MLE嫩？

#include <iostream>
using namespace std;
int N;
void f(int n, char a, char b, char c) {
    if(n==0) return ;
    f(n-1, a,c, b);
    cout << a << "->" << b << endl;
    cout << a << "->" << b << endl;
    f(n-1, c, b, a);
}
void h(int n){
    if(n==1){
        cout<<"A->C"<<endl;
        cout<<"A->B"<<endl;
    }
    f(n-1,'A','B','C');
    cout<<"A->C"<<endl;
    cout<<"A->C"<<endl;
    f(n-1,'B','A','C');
    cout<<"C->B"<<endl;
    h(n-1);
}
int main() {

    cin>>N;
    N/=2;
    h(N);
    return 0;
}