The Weekly Challenge

09. TASK #1: Common Characters

HEADLINES

Welcome to the Week #234 of The Weekly Challenge.

Let us all welcome, mauke, an expert in Perl to the Team PWC.

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


`Week`	`Perl`	`Raku`	`Blog`
`228`	58	28	24
`229`	57	30	24
`230`	62	32	25
`231`	68	38	31
`233`	60	35	29

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`Week`	`Guests`	`Contributions`	`Languages`
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`229`	13	55	17
`230`	15	54	20
`231`	18	83	24
`233`	15	59	16

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Blogs with Creative Title

1. What’s the Similar Frequency, Kenneth? by Adam Russell.

2. Words of a Sort by Arne Sommer.

3. PWC 233 Data on the side by Bob Lied.

4. Sorting, by similarity and frequency by Luca Ferrari.

5. Tune in to the right frequency! by Matthias Muth.

6. What’s the Frequency, Kenneth? by Packy Anderson.

7. Similar words and a rather strange ordering by Peter Campbell Smith.

8. Similar Frequency by Roger Bell_West.

9. Similar frequency by Simon Green.

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RECAP

Quick recap of The Weekly Challenge - 233 by Mohammad S Anwar.

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GUESTS

Please check out the guest contributions for the Week #233.

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 an array of words made up of alphabetic characters only.

Write a script to return all alphabetic characters that show up in all words including duplicates.

Example 1

Input: @words = ("java", "javascript", "julia")
Output: ("j", "a")

Example 2

Input: @words = ("bella", "label", "roller")
Output: ("e", "l", "l")

Example 3

Input: @words = ("cool", "lock", "cook")
Output: ("c", "o")

Task 2: Unequal Triplets

Submitted by: Mohammad S Anwar

You are given an array of positive integers.

Write a script to find the number of triplets (i, j, k) that satisfies num[i] != num[j], num[j] != num[k] and num[k] != num[i].

Example 1

Input: @ints = (4, 4, 2, 4, 3)
Ouput: 3

(0, 2, 4) because 4 != 2 != 3
(1, 2, 4) because 4 != 2 != 3
(2, 3, 4) because 2 != 4 != 3

Example 2

Input: @ints = (1, 1, 1, 1, 1)
Ouput: 0

Example 3

Input: @ints = (4, 7, 1, 10, 7, 4, 1, 1)
Output: 28

triplets of 1, 4, 7  = 3x2×2 = 12 combinations
triplets of 1, 4, 10 = 3×2×1 = 6  combinations
triplets of 4, 7, 10 = 2×2×1 = 4  combinations
triplets of 1, 7, 10 = 3x2x1 = 6 combinations

Last date to submit the solution 23:59 (UK Time) Sunday 17th September 2023.