The Weekly Challenge

9. TASK #1: Increment Decrement

HEADLINES

Welcome to the Week #323 of The Weekly Challenge.

Welcome aboard, Yitzchak Scott-Thoennes and thanks for your first contributions in Perl and Python.

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`Week`	`Perl`	`Raku`	`Blog`
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7. Ranking Code, Ranking Numbers by Matthias Muth.

8. The array is rank, but the string is formatted by Packy Anderson.

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10. The Strings Are Rank by Roger Bell_West.

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RECAP

Quick recap of The Weekly Challenge - 322 by Mohammad Sajid Anwar.

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GUESTS

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

Task 1: Increment Decrement

Submitted by: Mohammad Sajid Anwar

You are given a list of operations.

Write a script to return the final value after performing the given operations in order. The initial value is always 0.

Possible Operations:
++x or x++: increment by 1
--x or x--: decrement by 1

Example 1

Input: @operations = ("--x", "x++", "x++")
Output: 1

Operation "--x" =>  0 - 1 => -1
Operation "x++" => -1 + 1 =>  0
Operation "x++" =>  0 + 1 =>  1

Example 2

Input: @operations = ("x++", "++x", "x++")
Output: 3

Example 3

Input: @operations = ("x++", "++x", "--x", "x--")
Output: 0

Operation "x++" => 0 + 1 => 1
Operation "++x" => 1 + 1 => 2
Operation "--x" => 2 - 1 => 1
Operation "x--" => 1 - 1 => 0

Task 2: Tax Amount

Submitted by: Mohammad Sajid Anwar

You are given an income amount and tax brackets.

Write a script to calculate the total tax amount.

Example 1

Input: $income = 10, @tax = ([3, 50], [7, 10], [12,25])
Output: 2.65

1st tax bracket upto  3, tax is 50%.
2nd tax bracket upto  7, tax is 10%.
3rd tax bracket upto 12, tax is 25%.

Total Tax => (3 * 50/100) + (4 * 10/100) + (3 * 25/100)
          => 1.50 + 0.40 + 0.75
          => 2.65

Example 2

Input: $income = 2, @tax = ([1, 0], [4, 25], [5,50])
Output: 0.25

Total Tax => (1 * 0/100) + (1 * 25/100)
          => 0 + 0.25
          => 0.25

Example 3

Input: $income = 0, @tax = ([2, 50])
Output: 0

Last date to submit the solution 23:59 (UK Time) Sunday 1st June 2025.