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You are given a matrix that contains only ones and zeros. Think of the ones as columns in an otherwise empty floor plan. You want to fit a big square into the empty space (denoted by zeros). What is the largest empty square sub-matrix you can find in the given matrix? You will return the row and column extent of the sub-matrix. The answer may not be unique. We will test that your sub-matrix is square, that it is empty, and that it contains the correct number of elements.

Example:

Input a = [1 0 0; 0 0 0; 0 0 0] Output si = [2 3 2 3]

That is, the square indices are a(2:3,2:3). We verify that sum(sum(a(2:3,2:3))) is zero, and that it has four elements.

212 correct solutions
223 incorrect solutions

Last solution submitted on Sep 28, 2015

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1 Comment

Jean-Marie Sainthillier
on 30 Nov 2012

Splendid !

5 Comments