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

Solution Stats

463 Solutions
138 Solvers

Last Solution submitted on Nov 10, 2019

Last 200 Solutions

Problem Comments

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

Show 2 older comments

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)

Problem Recent Solvers138

Problem Tags

vector

Problem 865. Add more zeros

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers138

Suggested Problems

More from this Author45

Problem Tags

Problem 865. Add more zeros

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers138

Suggested Problems

More from this Author45

Problem Tags

Players