int main() {     int n, k;     cin >> n >> k;     long long res = 0;     int cnt = 0;     int mask = 1;     while (mask < k)     {         if (k&mask)         {             res += pow(n, cnt);         }         cnt++;         mask = (mask << 1);     }     cout << res << endl;     system("pause");     return 0; } 百分之90，难受