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  1. #include <iostream>
  2. #include <cstdio>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int n, flag;
  7. 	char s[305][305], diag, other;
  8. 	flag=0;
  9. 	scanf("%d", &n);
  10. 	for(int i=0; i<n; i++) scanf("%s\n", s[i]);
  11. 	diag=s[0][0];
  12. 	other=s[0][1];
  13. 	if(diag==other) flag=1;
  14. 	for(int i=0; i<n; i++) {
  15. 		for(int j=0; j<n; j++) {
  16. 			if(i==j || i+j==n-1) {
  17. 				if(s[i][j]!=diag) {
  18. 					flag=1;
  19. 					break;
  20. 				}
  21. 			} 
  22. 			else {
  23. 				if(s[i][j]!=other) {
  24. 					flag=1;
  25. 					break;
  26. 				}
  27. 			}
  28. 		}
  29. 		if(flag) break;
  30. 	}
  31. 	if(flag) printf("NO");
  32. 	else printf("YES");
  33. 	return 0;
  34. }
Success #stdin #stdout 0s 3344KB
comments ()
stdin 
3
xpx
pxp
xpe
stdout 
NO
https://ideone.com/fq6RN9
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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