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404.cxx
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404.cxx
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/*
* 404.cxx
*
* Copyright 2019 hp <hp@hp-HP-ProBook-4530s>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
*
*/
#include <bits/stdc++.h>
using namespace std;
int main()
{ long long int n,i,j,c=0,d=0;
char t,b;
cin >> n;
char a[n][n];
for(i=0;i<n;i++)
for(j=0;j<n;j++)
cin >> a[i][j];
t=a[0][0];b=a[0][1];
if(t==b){
cout << "NO";
return 0;
}
for(i=0;i<n;i++){
for(j=0;j<n;j++){
if(i==j || i+j==(n-1)){
if(a[i][j]==t){
c++;
}
}
else{
if(a[i][j]==b){
d++;
}}}}
if(c==(2*n)-1 && d==(n-1)*(n-1))
cout << "YES";
else
cout << "NO";
return 0;
}