Java Program to Print matrix in snake pattern

Last Updated : 07 Aug, 2022
Comments
Improve
Suggest changes
Like Article
Like
Report

Given an n x n matrix .In the given matrix, you have to print the elements of the matrix in the snake pattern.

Examples : 

Input :mat[][] = { {10, 20, 30, 40},
                   {15, 25, 35, 45},
                   {27, 29, 37, 48},
                   {32, 33, 39, 50}};
              
Output : 10 20 30 40 45 35 25 15 27 29
         37 48 50 39 33 32 

Input :mat[][] = { {1, 2, 3},
                   {4, 5, 6},
                   {7, 8, 9}};
Output : 1 2 3 6 5 4 7 8 9


 

Matrix printing

We traverse all rows. For every row, we check if it is even or odd. If even, we print from left to right else print from right to left. 

Java 
// Java program to print matrix in snake order
import java.util.*;
class GFG
{
    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);
    }
}
/* This code is contributed by Mr. Somesh Awasthi */

Output : 

10 20 30 40 45 35 25 15 27 29 37 48 50 39 33 32

Time complexity: O(n^2) where n is no of elements in rows and columns

Auxiliary Space: O(1) because constant space has been used

Please refer complete article on Print matrix in snake pattern for more details!


Next Article
Java Program to Print Pyramid Star Pattern
author
kartik
Improve
Article Tags :
Practice Tags :

Similar Reads