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Problem

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Spiral Matrix

Contributed by

Ratnesh

Last Updated: 23 Feb, 2023

Easy

0/40

0 upvotes

Problem Statement

You are given a 2D matrix ‘MATRIX’ of ‘N’*’M’ dimension. You have to return the spiral traversal of the matrix.

Example:

Input:
MATRIX = [ [1, 3, 5, 7], [10, 11, 16, 20], [23, 30, 34, 60] ]
Output:
1 3 5 7 20 60 34 30 23 10 11 16

Explanation: Starting from the element in the first row and the first column, traverse from left to right (1 3 5 7), then top to bottom (20 60), then right to left (34 30 23), then bottom to up (10) and then left to right (11 16).

Detailed explanation ( Input/output format, Notes, Images )

Input Format:

The first line of the input will contain two integers denoting the dimensions of the matrix ‘N’ and ‘M’. 
The following 'N' lines contain ‘M’ integers each.

Output Format:-

Output is printed on a separate line.

Note:-

You don’t need to print anything. Just implement the given function.

Constraints:

1 <= N, M <= 10^5
1 <= MATRIX [ i ] [ j ] <= 10^9
The sum of N*M over all test cases is less than 2*10^5.
Time Limit: 1 sec

Sample Input 1:

Sample Output 1:

1 3 7 15 21 20 19 10 12

Explanation Of Sample Input 1:

Input:
MATRIX = [ [1, 3, 7], [10, 12, 15], [19, 20, 21] ], 
Output:
1 3 7 15 21 20 19 10 12

Explanation: Starting from the element in the first row and the first column, traverse from left to right (1 3 7), then top to bottom (15 21), then right to the left (20 19), then bottom to up (10) and then left to right (12).

Sample Input 2:

4 4
1 5 9 13
14 15 16 17
19 20 21 50
59 60 71 80

Sample Output 2:

1 5 9 13 17 50 80 71 60 59 19 14 15 16 21 20

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