## Sichuan University offline programming competition question 2 ：Peter Of X

• Announcement company ：
• Yes   effect   period ：
• CSDN
• 2014-09-27 to 2015-09-26
• difficult   degree   etc.   level ：
• answer   topic   when   Long ：
• Programming language requirements ：
• 120 minute
• C C++ Java C#
Topic details

Peter It's a little boy , He can't always recite 26 English letters . therefore , The tricky English teacher gave him a very strange assignment , The teacher gave him a lesson from 26 It's made up of two English letters N*N Matrix （ We promise N It must be an odd number ）, Ask him if the pattern formed by this matrix is a standard “X”.

A standard X The definition of ：1、 All elements on the diagonal are the same letter .2、 All non diagonal elements are the same letter , And the letters are different from the letters on the diagonal .

If it is, then output “YES”. Otherwise output “NO”.

Input description narration ：

Multiple sets of test data （ The amount of data is 100 Within group ）. The first line of each group of test data is an integer N（1<=N<=300）, Represents the size of the table .

Here are N A line is a letter N*N Matrix .

Output description narration ：

Input data for each group , Output one line “YES” or “NO”.

Input example ：

5

xooox

oxoxo

soxoo

oxoxo

xooox

3

wsw

sws

wsw

3

xpx

pxp

xpe

Output example ：

NO

YES

NO

Answer key ： Direct simulation ;

```#include <iostream>
using namespace std;
#define MAX 300+1
int main(){
int n;
char map[MAX][MAX];
while (cin>>n){
for (int i=0;i<n;i++)
for (int j=0;j<n;j++)
cin>>map[i][j];
char a=map[0][0],b=map[0][1];
int flag=0;
if (a==b)
flag=1;
for (int i=0;i<n;i++){
for (int j=0;j<n;j++){
if (i==j||j==n-1-i){ // The inference on the diagonal
if (map[i][j]!=a){
flag=1;
break;
}
}
else{
if (map[i][j]!=b){
flag=1;
break;
}
}
}
if (flag)
break;
}
if (flag)
cout<<"NO"<<endl;
else
cout<<"YES"<<endl;
}
return 0;
} ```

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