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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. int solve (std::vector<int> a)
  5. {
  6.     int lonely = 0;
  7.     for (auto i: a)
  8.     {
  9.         lonely ^= i;
  10.     }
  11.     return lonely;
  12. }
  13.  
  14. int main() {
  15.     std::vector<int> v;
  16.     int n, num;
  17.  
  18.     std::cin >> n;
  19.     for (int i = 0; i < n; i++)
  20.     {
  21.         std::cin >> num;
  22.         v.push_back(num);
  23.     }
  24.  
  25.     std::cout << solve (v) << std::endl;
  26.  
  27.     return 0;
  28. }
Success #stdin #stdout 0s 3460KB
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https://ideone.com/n262n8
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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