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a guest Oct 21st, 2019 61 Never
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  1. /******************************************************************************
  2.  
  3.                               Online C++ Compiler.
  4.                Code, Compile, Run and Debug C++ program online.
  5. Write your code in this editor and press "Run" button to compile and execute it.
  6.  
  7. *******************************************************************************/
  8.  
  9. #include <iostream>
  10. #define MAX 1000000001
  11. using namespace std;
  12.  
  13.  
  14. int main()
  15. {
  16.    
  17.     int tab[MAX] = {};
  18.    
  19.     int n;
  20.     std::cin >> n;
  21.     for(int i = 0; i < n; ++i) {
  22.         int first, second;
  23.         std::cin >> first;
  24.         std::cin >> second;
  25.         tab[first]++;
  26.         tab[second]++;
  27.     }
  28.    
  29.     int numbers[2];
  30.     int odd_counter = 0;
  31.    
  32.     for(int i = 0; i < MAX; ++i) {
  33.         if(tab[i] > 0) {
  34.             if(tab[i] % 2 == 1) {
  35.                 numbers[odd_counter] = i;
  36.                 odd_counter++;  
  37.             }
  38.         }
  39.     }
  40.    
  41.     if(odd_counter == 2) {
  42.         std::cout << numbers[0] << " " << numbers[1];
  43.     }
  44.    
  45.     else {
  46.         std::cout << "NIE" << std::endl;
  47.     }
  48.  
  49.     return 0;
  50. }
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