Javascript Program to Print matrix in antispiral form

Javascript Program to Print matrix in snake pattern

Last Updated : 10 Sep, 2024

Given 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.

JavaScript

let M = 4;
let N = 4;

function print(mat) {
    let output = "";

    // Traverse through all rows
    for (let i = 0; i < M; i++) {

        // If current row is even, print from left to right
        if (i % 2 == 0) {
            for (let j = 0; j < N; j++)
                output += mat[i][j] + " ";

        // If current row is odd, print from right to left
        } else {
            for (let j = N - 1; j >= 0; j--)
                output += mat[i][j] + " ";
        }
    }
    console.log(output.trim());
}

// Driver code
let mat = [
    [10, 20, 30, 40],
    [15, 25, 35, 45],
    [27, 29, 37, 48],
    [32, 33, 39, 50]
];

print(mat);

Output

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

Complexity Analysis:

Time complexity: O(n^2) for given n*n matrix
Auxiliary space: O(1)

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

Javascript Program to Print matrix in antispiral form

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