Envío 6892

Código

import java.util.Scanner;
class Main
{
    public static void main(String[] args){
        
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int a[][] = new int[n][n];
        int hor = 0, ver = 0, diag = 0;
        
        for(int i = 0; i < n; i++){
            for(int j = 0; j < n; j++){
                a[i][j] = sc.nextInt();
            }
        }
        
        for(int i = 0; i < n; i++){
            for(int j = 0; j < n; j++){
                hor = hor + a[i][j];
                ver = ver + a[j][i];
            }
            diag = diag + a[i][i] + a[i][n-i-1];
        }
        
        if(hor == ver && hor / n == diag / 2){
            System.out.print("Yes");
        }else{
            System.out.print("No");
        }
    }
}