SnakeMatrix.java

package collectionz;

import java.util.*;
class SnakeMatrix
{
    static void print(int [][] mat)
    {
        // Traverse through all rows
        for (int i = 0; i < mat.length; i++)
        {

            // If current row is even, print from
            // left to right
            if (i % 2 == 0)
            {
                for (int j = 0; j < mat[0].length; j++)
                    System.out.print(mat[i][j] +" ");


            // If current row is odd, print from
            // right to left
            }
            else
            {
                for (int j = mat[0].length - 1; j >= 0; j--)
                    System.out.print(mat[i][j] +" ");
            }
        }
    }

    // Driver code
    public static void main(String[] args)
    {
        int mat[][] = new int[][]
        {
            { 10, 20, 30, 40 },
            { 15, 25, 35, 45 },
            { 27, 29, 37, 48 },
            { 32, 33, 39, 50 }
        };

        print(mat);
    }
}