What is the Spiral Matrix pattern?

The Spiral Matrix is a common coding interview pattern in Matrices problems. It provides a structured approach to solving related algorithm challenges efficiently.

When should I use Spiral Matrix?

Use the Spiral Matrix pattern when you encounter problems matching its characteristics. Check the "When to Use" and "Clues" sections in the lesson for specific indicators.

Is Spiral Matrix asked in FAANG interviews?

Yes, Spiral Matrix is an essential pattern commonly tested in FAANG and top tech company technical interviews.

Matrices

Medium

Spiral Matrix

Return all elements of the matrix in spiral order.

10 min read

Solve on LeetCode

Problem Understanding

Given an m x n matrix, return all elements of the matrix in spiral order (Right -> Down -> Left -> Up).

Interactive Visualization

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Strategy

We can simulate the spiral movement by defining boundaries (top, bottom, left, right):

Move Right: Traverse from left to right. Increment top.
Move Down: Traverse from top to bottom. Decrement right.
Move Left: Traverse from right to left. Decrement bottom. (Check top <= bottom first)
Move Up: Traverse from bottom to top. Increment left. (Check left <= right first)

Initialize top=0, bottom=rows-1, left=0, right=cols-1.
Loop while top <= bottom and left <= right.

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