import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc=new Scanner(System.in); while(sc.hasNext()){ int N=sc.nextInt(); int[][]a=new int[N][N]; for (int i = 0; i < a.length; i++) { for (int j = 0; j < a.length; j++) { a[i][j]=sc.nextInt(); } } if(iszheng(a)||isfan(a)) System.out.println("Yes!"); else System.out.println("No!"); } } static boolean iszheng(int[][] a){ for (int i = 0; i < a.length; i++) { for (int j = i+1; j < a.length; j++) { if(a[i][j]!=a[j][i]) return false; } } return true; } static boolean isfan(int[][]a){ for (int i = 0; i < a.length-1; i++) { for (int j = 0; j < a.length-1-i; j++) { int n=a.length-1-i-j; if(a[i][j]!=a[i+n][j+n]) return false; } } return true; } }
0.0分
0 人评分