The document outlines a 30-day roadmap for learning matrices problems of increasing difficulty. It provides examples of 4 matrix problems: rotating an image 90 degrees, returning a matrix's elements in spiral order, generating an n x n matrix filled with numbers from 1 to n^2 in spiral order, and setting an entire row and column of a matrix to 0 if any element is 0. The problems cover rotating, traversing, generating, and modifying matrices.

1. 30DAYS
DSA
ROADMAP
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2. Matíices
Rotate Image
Diť
ť
iculty – Medium
You aie given an n x n 2D matiix iepiesenting
an image, iotate the image by 90 degiees
(clockwise).
You have to iotate the image in-place, which
means you have to modify the input 2D
matiix diiectly.
Example:
Input: nums = [[1,2,3],[4,5,6],[7,8,9]]
Output: [[7,4,1],[8,5,2],[9,6,3]]
Píoblem link
DAY 3

3. Spiíal Matíix
Diť
ť
iculty – Medium
Given an m x n matíix, íetuín all elements of
the matíix in spiíal oídeí.
Example:
Input: nums = [[1,2,3],[4,5,6],[7,8,9]]
Output: [1,2,3,6,9,8,7,4,5]
Píoblem link

4. Spiíal Matíix II
Diť
ť
iculty - Medium
Given a positive integeí n, geneíate an n x n
matíix filled with elements fíom 1to n^2 in
spiíal oídeí.
Example:
Input: n = 3
Output: [[1,2,3],[8,9,4],[7,6,5]]
Píoblem link

5. Set Matíix Zeíoes
Diť
ť
iculty - Medium
Given an m x n integeí matíix matíix, if an
element is 0, set its entiíe íow and column
to 0's.Y
ou must do it in place.
Example:
Input: nums = [[1,1,1],[1,0,1],[1,1,1]]
Output: [[1,0,1],[0,0,0],[1,0,1]]
Píoblem link