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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int m,n,f,l; bool p=true;
  7. 	cin>>n>>m;
  8. 	vector <int> a(n);
  9. 	for (int i=0; i<m; i++){
  10. 		cin>>f>>l;
  11. 		a[f-1]++; a[l-1]++;
  12. 	}
  13. 	for (int i=0; i<n; i++){if (a[i]!=a[0]){p=false; break;}}
  14. 	if (p) cout<<"YES"<<endl;
  15. 	else cout<<"NO"<<endl;
  16. }
Success #stdin #stdout 0s 3416KB
comments (?)
stdin
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3 2
1 2
2 3
stdout
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NO
https://ideone.com/cCHxvo
Регулярный граф
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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