The Weekly Challenge

10. TASK #2: Hash-counting String

HEADLINES

Welcome to the Week #102. It has been relatively quiet week, I noticed. Even I am not well, just the seasonal bit. I hope to come back harder this week.

Today is the first Monday of the month and time to declare the Champion. I am proud to announce James Smith as the Champion of the Month.

This week, we received 37 contributions from guests in 15 languages.

I would like to THANK each and every guest contributors.

While we are talking about contributions, let’s share some interesting stats from the GitHub repository.

1. Commits: 14,770 (+200)

2. Pull Requests: 3,633 (+36)

3. Contributors: 160 (+1)

4. Fork: 201 (+2)

5. Stars: 90

Last but not least, I would like to thank each and every member for their support and encouragement.

Our solo sponsor Pete Sergeant has been a great support to keep us motivated. We are lucky that he agreed to continue the journey with us in the year 2021. I would like to personally thank Pete and his entire team for their generosity. It would be great if we could add few more to sponsor the prize money so that we could go back and declare weekly champions as we have done in the past. I hope and wish this will become possible in 2021. The amount doesn’t have to be huge. However, it would be nice to show off bunch of supporters. If an organisation comes forward and supports us then that would be the ultimate achievement.

RECAP

Quick recap of the “The Weekly Challenge - 101” by Mohammad S Anwar.

PERL REVIEW

Please check out Perl solutions review of the “Perl Weekly Challenge - 099” by Colin Crain.

If you missed any past reviews then please check out the collection.

RAKU REVIEW

If you missed any past reviews then please check out the collection.

CHART

Please take a look at the charts showing interesting data.

I would like to THANK every member of the team for their valuable suggestions. Please do share your experience with us.

NEW MEMBERS

Please find out How to contribute?, if you have any doubts.

Please try the excellent tool EZPWC created by respected member Saif Ahmed of Team PWC.

GUESTS

Please checkout the guest contributions for the Week #101.

Please find past solutions by respected guests. Please share your creative solutions in other languages.

TASK #1 › Rare Numbers

Submitted by: Mohammad S Anwar

You are given a positive integer $N.

Write a script to generate all Rare numbers of size $N if exists. Please checkout the page for more information about it.

Examples

(a) 2 digits: 65
(b) 6 digits: 621770
(c) 9 digits: 281089082

TASK #2 › Hash-counting String

Submitted by: Stuart Little

You are given a positive integer $N.

Write a script to produce Hash-counting string of that length.

The definition of a hash-counting string is as follows:

- the string consists only of digits 0-9 and hashes, ‘#’

- there are no two consecutive hashes: ‘##’ does not appear in your string

- the last character is a hash

- the number immediately preceding each hash (if it exists) is the position of that hash in the string, with the position being counted up from 1

It can be shown that for every positive integer N there is exactly one such length-N string.

Examples:

(a) "#" is the counting string of length 1
(b) "2#" is the counting string of length 2
(c) "#3#" is the string of length 3
(d) "#3#5#7#10#" is the string of length 10
(e) "2#4#6#8#11#14#" is the string of length 14

Last date to submit the solution 23:59 (UK Time) Sunday 7th March 2021.