小的盘子必须在大的盘子的上面
void hannoi(int n, char a, char b, char c )
{
if (n == 1)
{
res.push_back(to_string(n)+" from " +a+" to "+c);
}
else
{
hannoi(n - 1, a, c, b);
res.push_back(to_string(n) + " from " + a + " to " + c);
hannoi(n - 1, b, a, c);
}
}
int main()
{
int n;
cin >> n;
hannoi(n, 'A', 'B', 'C');
cout << res.size() << endl;
for (int i = 0; i < res.size(); i++)
{
cout << res[i] << endl;
}
return 0;
}