How should I practice Generate Spiral Matrix?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Temu phone screen problems in FastPrep.

Is Generate Spiral Matrix associated with Temu?

FastPrep tags this as a Temu phone screen coding practice problem when the problem catalog has that company and stage context.

Problem · Array

Generate Spiral Matrix

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Problem statement

Given a positive integer n, generate an n by n matrix filled with the integers from 1 through n * n in clockwise spiral order.

Place 1 in the top-left cell and begin by moving to the right. Turn clockwise whenever the next cell would leave the matrix or revisit an already filled cell.

Function

generateMatrix(n: int) → int[][]

Examples

Example 1

n = 3return = [[1,2,3],[8,9,4],[7,6,5]]

The values follow the outer clockwise ring before filling the center with 9.

Example 2

n = 1return = [[1]]

A one-cell matrix contains only 1.

Example 3

n = 4return = [[1,2,3,4],[12,13,14,5],[11,16,15,6],[10,9,8,7]]

Each completed boundary shrinks inward until all 16 values are written.

Constraints

1 <= n <= 100.
The result contains each integer from 1 through n * n exactly once.