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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int arr[222][222];
  4. int main(){
  5. 	ios::sync_with_stdio(false);
  6. 	cin.tie(0),cout.tie(0);
  7. 	int n;
  8. 	cin>>n;
  9. 	for(int i=1;i<n;i++){
  10. 		for(int j=1;j<=n;j++){
  11. 			if(i==j){
  12. 				continue;
  13. 			}
  14. 			cin>>arr[i][j];
  15. 		}
  16. 	}
  17. 	for(int i=1;i<=n;i++){
  18. 		for(int j=1;j<=n;j++){
  19. 			for(int k=1;k<=n;k++){
  20. 				if(i==j){
  21. 					continue;
  22. 				}
  23. 				if(i==k || j==k){
  24. 					continue;
  25. 				}
  26. 				if(i>j || i>k){
  27. 					continue;
  28. 				}
  29. 				if(j>k){
  30. 					return 0;
  31. 				}
  32. 				if(arr[i][j]+arr[j][k]<arr[i][k]){
  33. 					cout<<"Yes";
  34. 					return 0;
  35. 				}
  36. 			}
  37. 		}
  38. 	}
  39. 	cout<<"No";
  40. }
Success #stdin #stdout 0s 5324KB
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stdin
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4
25 40 65
30 55
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stdout
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Yes
https://ideone.com/uA35lt
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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