func_code_string: #include <bits/stdc++.h>   using namespace std;   void Read(int &x) {     char c;     while (c = getchar(), c != EOF)       if (c >=  0  && c <=  9 ) {         x = c -  0 ;         while (c = getchar(), c >=  0  && c <=  9 ) x = x * 10 + c -  0 ;         ungetc(c, stdin);         return;       }   }   int n, a, b;   stack<int> s;   bool dfs(long long now) {     if (now > b) return 0;     if (now == b) {       s.push(b);       return 1;     }     if (dfs(now << 1)) {       s.push(now);       return 1;     }     if (dfs(now * 10 + 1)) {       s.push(now);       return 1;     }     return 0;   }   int main() {     Read(a), Read(b);     if (dfs(a)) {       puts( YES );       printf( %u n , s.size());       while (!s.empty()) {         printf( %d  , s.top());         s.pop();       }     } else       puts( NO );   }   