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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int n, A, B;
  6. int const N = 1e5 + 5;
  7. int a[N];
  8. vector <int> kq;
  9.  
  10. int main()
  11. {
  12. //    freopen("me","r",stdin);
  13. //    freopen("cung","w",stdout);
  14.     ios_base::sync_with_stdio(false);
  15.     cin.tie(0);
  16.     cout.tie(0);
  17.  
  18.     cin >> n >> A >> B;
  19.     for(int i = 1 ; i <= n ; i++)
  20.         cin >> a[i];
  21.  
  22.     for(int i = 1 ; i <= n ; i++)
  23.         if(((A | a[i]) != A) && ((a[i] & B) == a[i]))
  24.         {
  25.             A = A | a[i] ;
  26.             kq.push_back(i);
  27.         }
  28.  
  29.     if(A != B)
  30.     {
  31.         cout << -1;
  32.         exit(0);
  33.     }
  34.  
  35.     cout << kq.size() << '\n';
  36.  
  37.     for(int v : kq) cout << v << ' ';
  38.  
  39. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/8RllPf
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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