func_code_string: #include <bits/stdc++.h>   using namespace std;   const int mod = 1e9 + 7;   long long power(long long base, long long expo, long long md = mod) {     if (base == 0) return 0;     long long res = 1;     base %= md;     while (expo > 0) {       if (expo & 1) {         res = res * base;         res %= md;       }       expo >>= 1;       base = (base * base) % md;     }     return res;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     long long tt = 1;     for (long long tc = 1; tc <= tt; tc++) {       long long x, d;       cin >> x >> d;       bitset<69> bit(x);       vector<long long> v;       for (long long i = 0; i < 69; i++) {         if (bit[i]) {           v.push_back(i);         }       }       vector<long long> sol;       long long ins = 1, cnt = 0;       for (auto &xo : v) {         long long times = xo;         cnt++;         while (times--) {           sol.push_back(ins);         }         ins += d;       }       for (long long i = 0; i < cnt; i++) {         sol.push_back(ins);         ins += d;       }       if ((long long)sol.size() > (10000))         cout <<  -1 n ;       else {         cout << sol.size() <<   n ;         for (auto &xo : sol) cout << xo <<    ;         cout <<   n ;       }     }     return 0;   }   