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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main() {
  6.   int num;
  7.   cin >> num;
  8.   long long res = 0;
  9.   for (int id = 0; id < 2 * num - 1; ++id) {
  10.     long long new_num;
  11.     cin >> new_num;
  12.     res ^= new_num;
  13.   }
  14.   cout << res;
  15. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/eLK1FZ
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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