C++ "Tháp Hà Nội"

#include <iostream>
using namespace std;
int n;

void THN(int n, char A, char B, char C){
    if (n == 0) return;
    THN(n-1, A, C, B);
    cout << "Move " << A << " --> " << C << endl;
    THN(n-1, B, A, C);
}

int main(){
    cout <<"Nhap n= ";
    cin >> n;
    THN(n, 'A', 'B' , 'C');
    return 0;
}