The Weekly Challenge

09. TASK #1: Common Characters

HEADLINES

Welcome to the Week #220 of The Weekly Challenge.

This week challenge is coming from a small town Jamshedpur in India as I had to make emergency visit to see my dad. He is still in ICU.

You will see less action this week from my side, so please bear with me.

Today, we are giving away Coupon #43 to Robert Ransbottom for the book, Learning Perl Exercises by brian d foy. I will share the details with you in a separate email.

PAST WINNERS



`S. No.`	`Name`	`S. No.`	`Name`

1.	`Cheok-Yin Fung`	2.	`W. Luis Mochan`
3.	`Robert DiCicco`	4.	`Kueppo Wesley`
5.	`Solathian`	6.	`Dario Mazzeo`
7.	`Peter Campbell Smith`	8.	`Kjetil Skotheim`
9.	`Neils van Dijke`	10.	`Laurent Rosenfeld`
11.	`Duncan C. White`	12.	`Ali Moradi`
13.	`Jorg Sommrey`	14.	`James Smith`
15.	`Alexander Pankoff`	16.	`Simon Green`
17.	`Robbie Hatley`	18.	`Bob Lied`
19.	`Athanasius`	20.	`David Ferrone`
21.	`Thomas Kohler`	22.	`Adam Russell`
23.	`E. Choroba`	24.	`Pip Stuart`
25.	`Roger Bell_West`	26.	`Flavio Poletti`
27.	`Dave Jacoby`	28.	`Mariano Spadaccini`
29.	`Lubos Kolouch`	30.	`Matthew Neleigh`
31.	`Paulo Custodio`	32.	`Tyler Bird`
33.	`Carlos Oliveira`	34.	`Avery Adams`
35.	`Matthias Muth`	36.	`Leo Manfredi`
37.	`Peter Meszaros`	38.	`Arne Sommer`
39.	`Jaldhar H. Vyas`	40.	`Mark Anderson`
41.	`Rob Turner`	42.	`BarrOff`
43.		44.
45.		46.
47.		48.
49.		50.

Last 5 weeks mainstream contribution stats. Thank you Team PWC for your support and encouragements.


`Week`	`Perl`	`Raku`	`Blog`
`215`	60	32	23
`216`	40	22	23
`217`	60	32	23
`218`	43	22	16
`219`	36	22	23

Last 5 weeks guest contribution stats. Thank you each and every guest contributors for your time and efforts.


`Week`	`Guests`	`Contributions`	`Languages`
`215`	10	47	16
`216`	11	33	14
`217`	09	34	13
`218`	10	36	15
`219`	12	37	15

TOP 10 Guest Languages

Do you see your favourite language in the Top 10? If not then why not contribute regularly and make it to the top.

 1. Python  (1575)
 2. Haskell (553)
 3. Ruby    (523)
 4. Lua     (475)
 5. C       (424)
 6. C++     (377)
 7. Rust    (366)
 8. BQN     (299)
 9. Go      (258)
10. Java    (225)

Blogs with Creative Title

1. Sorted Expenditure by Arne Sommer.

2. Squaring Up by Avery Adams.

3. Return of the Kit by Jorg Sommrey.

4. building a tree using a stack by Luca Ferrari.

5. This is Perl! We got this, no problem! by Matthias Muth.

6. Any more fares, please? by Peter Campbell Smith.

7. Travel for Squares by Roger Bell_West.

8. The cheapest way to the square by Simon Green.

GitHub Repository Stats

1. Commits: 32,722 (`+83`)

2. Pull Requests: 8,174 (`+30`)

3. Contributors: 224

4. Fork: 280

5. Stars: 153

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 2023. 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 2023. 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 Weekly Challenge - 219 by Mohammad S Anwar.

PERL REVIEW

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 check out the guest contributions for the Week #219.

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

Task 1: Common Characters

Submitted by: Mohammad S Anwar

You are given a list of words.

Write a script to return the list of common characters (sorted alphabeticall) found in every word of the given list.

Example 1

Input: @words = ("Perl", "Rust", "Raku")
Output: ("r")

Example 2

Input: @words = ("love", "live", "leave")
Output: ("e", "l", "v")

Task 2: Squareful

Submitted by: Mohammad S Anwar

You are given an array of integers, @ints.

An array is squareful if the sum of every pair of adjacent elements is a perfect square.

Write a script to find all the permutations of the given array that are squareful.

Example 1:

Input: @ints = (1, 17, 8)
Output: (1, 8, 17), (17, 8, 1)

(1, 8, 17) since 1 + 8 => 9, a perfect square and also 8 + 17 => 25 is perfect square too.
(17, 8, 1) since 17 + 8 => 25, a perfect square and also 8 + 1 => 9 is perfect square too.

Example 2:

Input: @ints = (2, 2, 2)
Output: (2, 2, 2)

There is only one permutation possible.

Last date to submit the solution 23:59 (UK Time) Sunday 11th June 2023.