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Java Program to Print matrix in snake pattern

  • Last Updated : 11 Jan, 2022

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 

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


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