package arrs;

public class q2 {

    public static void main(String[] args) {
        int a[][] = {
                    {0,0,0,1},
                    {0,0,1,0},
                    {0,1,0,0},
                    {1,0,0,0}};
        boolean diag = true;
        //case 1:
        int upperright= a[0][0];
        for(int i=0;i<a.length;i++)
            for(int j=0;j<a[i].length;j++){
                if((i==j && a[i][j] != upperright))
                    diag = false;
                if (i!=j && a[i][j] == upperright)
                    diag = false;
            }
        if(diag==false){
            diag = true;
            //case 2:
            int upperright2= a[0][a.length-1];
            for(int i=0;i<a.length;i++)
                for(int j=0;j<a.length;j++){
                    if((a[i][a.length-1-i] != upperright2))
                        diag = false;
                    if (j != a.length -1 - i && a[i][j] == upperright2)
                        diag = false;
                }
        }
        System.out.println(diag);
    }

}