Problem 56473. IQpuzzler Preparation #2: Detect isolated zeros in a 2D matrix

Stefan Abendroth

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Return true if any isolated single zeros are present in the input M-by-N matrix (zeros with all adjacent elements being non-zero).
Example:
[ 2 2 0
  2 0 5        ==> true
  5 5 5 ]
[ 2 2 3
  0 0 5        ==> false
  5 5 5 ]
Background:
This function can be useful in different board games, such as Go, or the upcoming IQpuzzler challenge.

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25 Solutions

11 Solvers

Last Solution submitted on Jun 03, 2026

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2 Comments

DJ on 7 Nov 2022

Since when does diagonally adjacent element are not counted as adjacent?
Or maybe you should clarify what you mean by adjacent.

Stefan Abendroth on 7 Nov 2022

The first example in the problem description was chosen just for this reason.

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