Problem 34. Binary numbers

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Given a positive, scalar integer n, create a (2^n)-by-n double-precision matrix containing the binary numbers from 0 through 2^n-1. Each row of the matrix represents one binary number. For example, if n = 3, then your code could return

>> binary_numbers(3)

ans =

     1     1     1
     0     0     0
     0     1     1
     0     1     0
     0     0     1
     1     0     0
     1     1     0
     1     0     1

The order of the rows does not matter.

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Last Solution submitted on Jun 15, 2026

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Jigar Gada on 10 Nov 2012

matlab functions should not be allowed. Let people think of the solution from scratch.

Jon on 18 Nov 2013

I actually use a function to do this in my project, but my original code scored 47.

MDK on 21 Oct 2014

I had all the test cases working properly except for n=10!
This is very weird!!

Gareth Lee on 10 Nov 2014

what's meaning?
when n = 3;
A = binary_numbers(n);
assert(all(A(:) == 0 | A(:) == 1))

Sanzhar Askaruly on 3 Jul 2019

fun!

Anton Casas on 25 Oct 2020

Very fun problem!

akihisa yorozu on 21 Aug 2021

More difficult than I expected!

Panggah Prabawa on 4 Jul 2022

There was a guy who solved this problem with around 11k code size. Absolute madlad.

Anudeep on 9 Nov 2022

Fun exercise!

Riya on 10 Nov 2022

difficult that I intended it to be.

Yacine on 5 Oct 2024

Wait until you see the guy who solved it with a +41k code size.

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