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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. void solve(){
  4. 	int n;
  5. 	cin>>n;
  6.  
  7. 	int ans =0;
  8.  
  9. 	vector<int>v(n);
  10. 	for(int i=0;i<n;i++){
  11. 		cin>>v[i];
  12. 	}
  13. 	for(int i=0;i<n;i++){
  14. 		int ans =ans^v[i];
  15. 	}
  16.  
  17. 	cout<<ans<<endl;
  18.  
  19.  
  20.  
  21.  
  22.  
  23. }
  24. int main() {
  25. 	int t;
  26. 	cin>>t;
  27. 	while(t--){
  28. 		solve();
  29. 	}
  30. 	return 0;
  31. }
Success #stdin #stdout 0s 5276KB
comments (?)
stdin
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6
4
1 2 3 0
8
3 1 4 1 5 9 2 6
6
1 5 4 1 4 7
5
0 0 0 0 0
7
1 1 9 9 0 1 8
3
100 100 0
stdout
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0
0
0
0
0
0
https://ideone.com/I7Zpai
language:
C++ (gcc 8.3)
created:
11 days ago
visibility:
public

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