fork download
copy 
  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. # define ll long long int
  4.  
  5. void solve(){
  6.     ll n,y;
  7.     cin>>n>>y;
  8.     ll arr[n];
  9.     ll x=0;
  10.     for(ll i=0;i<n;i++){
  11.         cin>>arr[i];
  12.         x |= arr[i];
  13.     }
  14.     ll ans = 0;
  15.     ans = x^y;
  16.     if((ans | x) == y){
  17.         cout<<ans<<endl;
  18.         return;
  19.     } 
  20.  
  21.     cout<<-1<<endl;
  22. }
  23.  
  24. int main() {
  25.  
  26.     ll t;
  27.     cin>>t;
  28.     while(t--){
  29.         solve();
  30.     }
  31.     return 0;
  32. }
  33.  
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin
copy 
4
4 15
3 5 6 2
3 8
1 2 1
1 1
0
5 7
1 2 4 2 1
stdout
copy 
8
-1
1
0
https://ideone.com/NU0Tzz
language:
C++ (gcc 8.3)
created:
31 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!