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DescriptionQ440
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Q440FWASIC interview problem

Traverse a matrix in spiral order

TechniquesMatrixBoundary simulation
DifficultyMedium
TopicMatrices
LanguageSystemVerilog
Requirements4 checkpoints
01

Problem

Return the elements of a rectangular matrix in clockwise spiral order.

Example input and output

Use this case to check your interpretation
Input
matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
Output
[1, 2, 3, 6, 9, 8, 7, 4, 5]
Explanation

Each perimeter is emitted clockwise before the bounds contract to the next inner layer.

02

Requirements (4)

  • Support rectangular and single-row or single-column inputs.
  • Assume every input row has the same number of columns.
  • Guard the bottom and left traversals after shrinking the boundaries.
  • Return an empty queue for an empty input.