Problem 865. Add more zeros

Created by Jean-Marie Sainthillier

Solve Later

Find code that adds one 0 to each sequence of 0 in a string (composed with only 0 or 1).

For example:

 '1010' -> '100100'
 '0110' -> '001100'
 '1000' -> '10000'
 '1111' -> '1111'

Solve

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474 Solutions
140 Solvers

Last Solution submitted on Jan 15, 2020

Last 200 Solutions

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1 Comment

1 Comment

Pablo Lobo on 4 Jan 2017

Didn't really understand the problem right from reading the task itself, but from reading the test cases. Really fun problem though. First time I used regexprep function, so I learned a lot!

Solution Comments

Solution 314972

1 Comment

1 Comment

Marcel on 7 Jan 2014

no regexp.

Solution 120981

2 Comments

2 Comments

Khaled Hamed on 1 Aug 2012

The problem asks to "add" a zero, no mention of append or prepend! Nice general solution though, and a new trick learned ($&0)

Donovan Greene on 22 Jun 2017

I feel I've overcomplicated my solution
regexprep(x, '(?(?=0[^0]|0$)0|)', '00')

Solution 119090

5 Comments

5 Comments

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Ned Gulley on 26 Jul 2012

I didn't know about $0! Nifty.

Khaled Hamed on 26 Jul 2012

Neither did I! Matlab has great help.

Richard Zapor on 31 Jul 2012

The solution is not correct for the generalized case. 0$0 does a pre-pend of 0 not an append. The correct general solutions is either $00, or better to avoid operator ($0) confusion with the test set using 0s is operator ($%) $&0.

Richard Zapor on 31 Jul 2012

Khaled Hamed on 1 Aug 2012

The problem asks to "add" a zero, no mention of append or prepend! Nice general solution though, and a new trick learned ($&0)

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Problem 865. Add more zeros

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Problem 865. Add more zeros

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