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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int n, nowa=-1, nowb=-1, a, b, flag=1;
  7.  
  8. 	cin>>n;
  9.  
  10. 	while(n--){
  11. 		cin>>a>>b;
  12.  
  13. 		if(nowa >a || nowb >b){
  14. 			cout<<"no";
  15. 			return 0;
  16. 		}
  17.  
  18. 		nowa=a;
  19. 		nowb=b;
  20. 	}
  21.  
  22. 	cout<<"yes";
  23.  
  24. 	return 0;
  25. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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5
1 2
0 0
4 3
2 3
5 5
stdout
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no
https://ideone.com/WkNSzx
language:
C++ (gcc 8.3)
created:
1 hour ago
visibility:
public

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