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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	// your code goes here
  6. 	int n;
  7. 	cin>>n;
  8. 	int h[n],a[n];
  9. 	for(int i=0;i<n;i++)
  10. 	{
  11. 		cin>>h[i]>>a[i];
  12. 	}
  13. 	int q=0;
  14. 	for(int i=0;i<n;i++)
  15. 	{
  16. 		for(int j=0;j<n;j++)
  17. 		{
  18. 			if(i!=j)
  19. 			{
  20. 				if(h[i]==a[j]) q++;
  21. 			}
  22. 		}
  23. 	}
  24. 	cout<<q;
  25. 	return 0;
  26. }
Success #stdin #stdout 0s 4564KB
comments (?)
stdin
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4
100 42
42 100
5 42
100 5
stdout
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5
https://ideone.com/iHfcQH
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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