func_code_string: #include <bits/stdc++.h>   using namespace std;   template <typename T1, typename T2>   bool umin(T1 &x, const T2 &y) {     if (x > y) return x = y, true;     return false;   }   template <typename T1, typename T2>   bool umax(T1 &x, const T2 &y) {     if (x < y) return x = y, true;     return false;   }   template <typename T>   T getint() {     char c = getchar();     T p = 1, x = 0;     while (c ==     || c ==   n ) c = getchar();     if (c ==  - ) p = -1, c = getchar();     while (c >=  0  && c <=  9 ) x = x * 10 + c -  0 , c = getchar();     return x * p;   }   const int INF = (int)2e9 + 10;   const int mod = (int)1e9 + 7;   const int N = (int)1e6 + 10;   const long long LLINF = (long long)1e18 + 11;   const long double pi = acos(-1.0);   const long double eps = 1e-10;   int x, d;   int main() {     ios_base::sync_with_stdio(0);     cin >> x >> d;     long long mn = 1;     vector<long long> ans;     for (int i = 0; i < 31; ++i) {       if (!(x & (1 << i))) continue;       for (int j = 0; j < i; ++j) {         ans.push_back(mn);       }       mn += d;       ans.push_back(mn);       mn += d;     }     cout << ans.size() <<   n ;     for (auto x : ans) cout << x <<    ;     return 0;   }   