Print matrix in snake pattern

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.

C++

// C++ program to print matrix in snake order 
#include <iostream> 
#define M 4 
#define N 4 
using namespace std; 
  
void print(int mat[M][N]) 
{ 
    // Traverse through all rows 
    for (int i = 0; i < M; i++) { 
  
        // If current row is even, print from 
        // left to right 
        if (i % 2 == 0) { 
            for (int j = 0; j < N; j++) 
                cout << mat[i][j] << " "; 
  
        // If current row is odd, print from 
        // right to left 
        } else { 
            for (int j = N - 1; j >= 0; j--) 
                cout << mat[i][j] << " "; 
        } 
    } 
} 
  
// Driver code 
int main() 
{ 
    int mat[][] = { { 10, 20, 30, 40 }, 
                    { 15, 25, 35, 45 }, 
                    { 27, 29, 37, 48 }, 
                    { 32, 33, 39, 50 } }; 
  
    print(mat); 
    return 0; 
} 

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 */

Python 3

# Python 3 program to print 
# matrix in snake order 
M = 4
N = 4
  
def printf(mat): 
    global M, N 
      
    # Traverse through all rows 
    for i in range(M): 
          
        # If current row is 
        # even, print from 
        # left to right 
        if i % 2 == 0: 
            for j in range(N): 
                print(str(mat[i][j]), 
                          end = " ") 
  
        # If current row is  
        # odd, print from 
        # right to left 
        else: 
            for j in range(N - 1, -1, -1): 
                print(str(mat[i][j]),  
                          end = " ") 
  
# Driver code 
mat = [[ 10, 20, 30, 40 ], 
       [ 15, 25, 35, 45 ], 
       [ 27, 29, 37, 48 ], 
       [ 32, 33, 39, 50 ]] 
  
printf(mat) 
  
# This code is contributed 
# by ChitraNayal 

C#

// C# program to print  
// matrix in snake order 
using System; 
class GFG 
{ 
    static void print(int [,]mat) 
    { 
        // Traverse through all rows 
        for (int i = 0;  
                 i < mat.GetLength(0); i++) 
        { 
  
            // If current row is  
            // even, print from  
            // left to right 
            if (i % 2 == 0) 
            { 
                for (int j = 0;  
                         j < mat.GetLength(1); j++) 
                    Console.Write(mat[i, j] + " "); 
  
  
            // If current row is  
            // odd, print from  
            // right to left 
            } 
            else
            { 
                for (int j = mat.GetLength(1) - 1;  
                         j >= 0; j--) 
                    Console.Write(mat[i, j] + " "); 
            } 
        } 
    } 
  
    // Driver code 
    public static void Main() 
    { 
        int [,]mat = {{ 10, 20, 30, 40 }, 
                      { 15, 25, 35, 45 }, 
                      { 27, 29, 37, 48 }, 
                      { 32, 33, 39, 50 }}; 
  
        print(mat); 
    } 
} 
  
// This code is contributed 
// by ChitraNayal 

PHP

<?php 
// PHP program to print  
// matrix in snake order 
$M= 4; 
$N =4; 
  
function printLN($mat) 
{ 
    global $M; 
    global $N; 
      
    // Traverse through all rows 
    for ($i = 0; $i < $M; $i++)  
    { 
  
        // If current row is even,  
        // print from left to right 
        if ($i % 2 == 0)  
        { 
            for ($j = 0; $j < $N; $j++) 
                echo $mat[$i][$j], " "; 
  
        // If current row is odd,  
        // print from right to left 
        }  
        else 
        { 
            for ($j = $N - 1; $j >= 0; $j--) 
                echo $mat[$i][$j] , " "; 
        } 
    } 
} 
  
// Driver code 
$mat = array(array(10, 20, 30, 40), 
             array(15, 25, 35, 45), 
             array(27, 29, 37, 48), 
             array(32, 33, 39, 50)); 
  
printLN($mat); 
  
// This code is contributed by ajit  
?> 

Output :

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

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

C++

Java

Python 3

C#

PHP

tags:

leave a comment

0 Comments

Subscribe to Our Newsletter

Top Followed books