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scramble_boy

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Mar 21st, 2018
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  1. #include <iostream>
  2. #include <map>
  3.  
  4. using namespace std;
  5.  
  6. int main(){
  7. int n, x, y;
  8. int c = 0;
  9. cin >> n;
  10. map<int, int> g;
  11. for (int i = 0; i < n-1; ++i){
  12. cin >> x >> y;
  13. g[x]++;
  14. }
  15. for (map<int, int>::iterator it = g.begin(); it != g.end(); it++)
  16. if (it->second == 1) c++;
  17. cout << c << endl;
  18. return 0;
  19. }
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