Problem 924. intersection of matrices

Created by Richard

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Given two matrices filled with ones and zeros, determine if they share a common row, column entry. These matrices are of identical size.
Examples:
Inputs A = [1     0     0     0     0
            0     1     0     0     0
            0     0     1     0     0
            0     0     0     1     0
            0     0     0     0     1 ] 
   and B = [0     1     0     0     0
            0     0     1     0     0
            0     0     0     1     0
            0     0     0     0     1
            1     0     0     0     0 ]
Output tf is false
Inputs A = [1     1     1     0     1
            1     1     1     1     0
            0     1     1     1     1
            1     0     1     1     1
            1     1     0     1     1 ]
   and B = [0     1     0     0     0
            1     0     0     0     0
            0     0     0     0     1
            0     0     0     1     0
            0     0     1     0     0]
Output tf is true

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1842 Solutions
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Last Solution submitted on Jan 01, 2026

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10 Comments

10 Comments

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Marcel on 31 Dec 2013

I guess zeros are not included as common elements.

Elmar Zander on 3 Mar 2017

Yes. Seems to be a somewhat "ill-posed" problem...

Andrew Newell on 18 Apr 2017

What does "they share a common row, column entry" mean?

Nanfei Cheng on 23 Sep 2020

I think it should be a non-zero common row, column entry.

Chien-Han Su on 4 Nov 2020

Just consider the problem to be "Is there any i, j such that A(i,j) == B(i,j) == 1"

Jeong Suong Yang on 9 Nov 2020

I guess it means intersection of arrays, literally.

Kleber Zuza Nobrega on 20 Apr 2021

Do you mind do explain in a different way? it is not clear for what exactly i should do. It miss 3 problems for me, but in any of them it is not clear the problem itself.

Marco Riani on 22 Jan 2022

A small addendum to the comment of Chien-Han Su

Just consider the problem to be "Is there any i, j such that A(i,j) == B(i,j) and A(i,j) or B(i,j) ~=0"

Jung Un Park on 5 Jul 2023

Problem description is poor.

Olayinka on 11 Nov 2023

Please explain this problem for further clarity

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