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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. public class Main
  6. {
  7. 	public static void main(String[] args)  throws IOException
  8. 	{
  9. 		Scanner in = new Scanner(System.in);
  10. 		int n = in.nextInt();
  11. 		int a[][] = new int[n][n];
  12. 		for(int i = 0; i < n; i++) {
  13. 			for(int j = 0; j < n; j++) {
  14. 				a[i][j] = in.nextInt();
  15. 				if ((i == j) && (a[i][j] == 1)) {
  16. 					System.out.print("NO");
  17. 					return;
  18. 				}
  19. 			}
  20. 		}
  21. 		for(int i = 0; i < n; i++) {
  22. 			for(int j = 0; j < n; j++) {
  23. 				if (a[i][j] != a[j][i]) {
  24. 					System.out.print("NO");
  25. 					return;
  26. 				}
  27. 			}
  28. 		}
  29. 		System.out.print("YES");
  30. 	}
  31. }
Success #stdin #stdout 0.07s 2184192KB
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stdin
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4
0 0 1 1
0 0 0 1
1 0 0 0
1 1 0 0
stdout
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YES
https://ideone.com/HmfyZy
2470
language:
Java (12.0.1)
created:
5 years ago
visibility:
secret

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