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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. const int MaxN=3e4;
  5.  
  6. int N;
  7. int s[MaxN];
  8. int e[MaxN];
  9. int main (){
  10. 	for(int t=1;cin>>N;t++){
  11. 		for(int n=0;n<N;n++)
  12. 			cin>>s[n]>>e[n];
  13. 		sort(s,s+N);
  14. 		sort(e,e+N);
  15. 		int ans=N*(N-1)/2;
  16. 		for(int m=0,n=0;n<N;n++){
  17. 			while(m<N && e[m]<=s[n])
  18. 			  m++;
  19. 			ans-=m;
  20. 		}
  21. 		cout<<"Case "<<t<<": "<<ans<<"\n";
  22. 	}
  23. 	return 0;
  24. }
Success #stdin #stdout 0.01s 5312KB
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https://ideone.com/kwDMSI
language:
C++14 (gcc 8.3)
created:
11 days ago
visibility:
public

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