lab4.java

import java.util.Scanner;
public class lab4
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        int R = sc.nextInt(), C = sc.nextInt();
        int matrix[][] = new int[R][C];
        for(int row = 0; row < R; row++)
        {
            for(int col = 0; col < C; col++)
            {
                matrix[row][col] = sc.nextInt();
            }
        }
        for(int col = 1; col < C; col++)
        {
            if(col % 2 != 0)
            {
                for(int row = 0, rev = R - 1; row < R / 2; row++, rev--)
                {
                    int temp = matrix[row][col];
                    matrix[row][col] = matrix[rev][col];
                    matrix[rev][col] = temp;
                }
            }
        }
        for(int row = 0; row < R; row++)
        {
            for(int col = 0; col < C; col++)
            {
                System.out.print(matrix[row][col] + " ");
            }
            System.out.println();
        }
    }
}