func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 3e6 + 50;   const int oo = 1e9;   const int mod = 1e9 + 7;   long long a[N];   int main() {     long long n, m;     cin >> n >> m;     long long c = 1;     int cur = 0;     for (int i = 30; i; i--) {       while (n >= (1 << i) - 1) {         for (int j = 1; j <= i; j++) a[cur++] = c;         c += m;         n -= (1 << i) - 1;       }     }     cout << cur << endl;     for (int i = 0; i < cur; i++) cout << a[i] <<    ;     puts(  );   }   