func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     unsigned long long i, j, k, l, r, n, m;     scanf( %llu , &l);     scanf( %llu , &r);     scanf( %llu , &k);     j = k;     n = ceil(log(l) / (double)log(k));     unsigned long long chq = 0;     chq = max(chq, (unsigned long long)(floor(log(r) / (double)log(k))));     if (chq < n) {       puts( -1 );       return 0;     }     k = pow(j, n);     bool ok = false;     for (i = n; i <= chq; i++) {       if (k > r) break;       ok = true;       printf( %llu , k);       printf(   );       ;       k *= j;     }     if (k == r) printf( %llu , k);     if (!ok) printf( -1 );     printf(  n );   }   