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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n; cin >> n;
  6. 	vector<int> arr(n);
  7.     long long ans = 0, x;
  8.  
  9.     for(int i=0;i<n;i++) cin >> arr[i];
  10.  
  11.     if (n % 2 == 0) {
  12.         cout << 0;
  13.         return 0;
  14.     }
  15.  
  16.     for(int i=0;i<n;i+=2){
  17.         ans ^= arr[i];
  18.     }
  19.     cout << ans % 1000000007;
  20. }
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/P2t9Pk
language:
C++14 (gcc 8.3)
created:
3 hours ago
visibility:
public

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