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- #include<stdio.h>
- #include<string.h>
- int main(){
- int n, flag=1;
- char a[30][30],c=a[0][0],d=a[0][1];
- scanf("%d",&n);
- for(int i=0;i<n;i++) {
- scanf("%s", a[i]);
- }
- for(int i=0;i<n;i++)
- for(int j=0;j<n;j++){
- if((i==j)||((i+j)==n-1)){
- if(a[i][j]!=c)
- flag=0;
- }
- else if(a[i][j]!=d)
- flag=0;
- }
- if((c!=d) && flag)
- printf("YES\n");
- else
- printf("NO\n");
- return 0;
- }
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