HANOI Pb Info

#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("hanoi.in");
ofstream fout("hanoi.out");
void h(int n, char A, char B, char C)
{
    if(n==1)
        fout<<A<<"->"<<C<<endl;
    else
    {
        h(n-1, A, C, B);
        h(1, A, B, C);
        h(n-1, B, A, C);
    }
}

int main()
{
    int n, cnt=1;
    fin>>n;
    for(int i=0; i<n; i++)
        cnt*=2;
    fout<<cnt-1<<endl;
    h(n, 'A', 'B', 'C');
    return 0;
}