transformation from a to b – codeforce 727a

#include <vector>
using namespace std;

int a, b;
int () {
    cin >> a >> b;
    vector<int> v;
    int ok = 1;
    while (b > a) {
        
        v.push_back(b);
        if ((b & 1) == 0) {
            b = b / 2;
        }
        else if (b % 10 == 1) {
            b = b / 10;
        }
        else { ok = 0; break;}
    }

    if (b != a) ok = 0; 
    else v.push_back(a);


    if (!ok) cout << "NO" << endl;
    else {
        cout << "YES" << endl;
        cout << v.size() << endl;
        for (int i = v.size()-1; i >0; i--)
            cout << v[i] << " ";
        cout << v[0] << endl;
    }
    return 0;
}