A recursive function that can check if a number num is power a anohter number base.

bool isPowerof(long long num, long long base)
{
    if (num <= 0)
        return false;
    if (num % base == 0)
        return isPowerof(num / base, base);
    if (num == 1)
        return true;
    return false;
}

1. Limitation : num<= $$$2^{62}$$$ and 2<=base<= $$$2^{62}$$$
   
2. Time complexity : O($$$log_{base}^{num}$$$).
   
3. Sample submission : 169977243.