func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int x, d, nxt = 1, arr[10001] = {0}, pos = 0;     cin >> x >> d;     for (int j = 30; j >= 0; j--)       if (x >= (((long long int)1 << j))) {         x -= ((long long int)1 << j);         for (int i = 1; i <= j; i++) arr[pos++] = nxt;         nxt += d;         arr[pos++] = nxt;         nxt += d;       }     if (x == 0) {       cout << pos << endl;       for (int j = 0; j < pos; j++) cout << arr[j] <<    ;       cout << endl;     } else       cout << -1 << endl;     return 0;   }   