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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. int main() 
  6. {
  7. 	int n,m;
  8. 	cin >> n>>m;
  9. 	vector<int> a(2*m);
  10. 	string r ="YES";
  11.  
  12. 	for (int i=0;i<2*m;i++)
  13. 		cin>>a[i];
  14.  
  15. 	for(int i=0;i<2*m-2;i+=2)
  16.     {
  17.         for(int j=2;j<2*m;j+=2)
  18.             if(a[i]==a[j+i] &&  a[i+1]==a[j+i+i])   r="NO";
  19.     }
  20.     cout<<r;
  21. 	return 0;
  22. }
Success #stdin #stdout 0s 15240KB
comments (?)
stdin
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5 11
1 2
1 3
1 5
3 2
2 3
2 5
4 1
4 2
4 3
4 5
5 3
stdout
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NO
https://ideone.com/IAHnax
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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