18번

 

package JavaFestival;

import java.util.Scanner;

public class jar18 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N=sc.nextInt();
		int[][] array = new int[N][N]; 
		
		for(int i=0; i<N;i++) {
			for(int j=0;j<N;j++) {
				if(i%2==0) {
					array[i][j]=(i*5)+(j+1);
				}else {
					array[i][j]=(i*5+5)-j;
				}
				System.out.println(array[i][j]+" ");
			}
			System.out.println();
		}
	}
}