The Weekly Challenge

9. TASK #1: Smaller Than Current

HEADLINES

Welcome to the Week #337 of The Weekly Challenge.

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With great pleasure, I declare Simon Proctor as the next champion. As of today, he has contributed 285 Raku, 5 Perl and 17 blogs. He is currently ranked #38 in the leaderboard. Congratulation Simon.

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RECAP

Quick recap of The Weekly Challenge - 336 by Mohammad Sajid Anwar.

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Task 1: Smaller Than Current

Submitted by: Mohammad Sajid Anwar

You are given an array of numbers, @num1.

Write a script to return an array, @num2, where $num2[i] is the count of all numbers less than or equal to $num1[i].

Example 1

Input: @num1 = (6, 5, 4, 8)
Output: (2, 1, 0, 3)

index 0: numbers <= 6 are 5, 4    => 2
index 1: numbers <= 5 are 4       => 1
index 2: numbers <= 4, none       => 0
index 3: numbers <= 8 are 6, 5, 4 => 3

Example 2

Input: @num1 = (7, 7, 7, 7)
Output: (3, 3, 3, 3)

Example 3

Input: @num1 = (5, 4, 3, 2, 1)
Output: (4, 3, 2, 1, 0)

Example 4

Input: @num1 = (-1, 0, 3, -2, 1)
Output: (1, 2, 4, 0, 3)

Example 5

Input: @num1 = (0, 1, 1, 2, 0)
Output: (1, 3, 3, 4, 1)

Task 2: Odd Matrix

Submitted by: Mohammad Sajid Anwar

You are given row and col, also a list of positions in the matrix.

Write a script to perform action on each location (0-indexed) as provided in the list and find out the total odd valued cells.

For each location (r, c), do both of the following:

a) Increment by 1 all the cells on row r.
b) Increment by 1 all the cells on column c.

Example 1

Input: $row = 2, $col = 3, @locations = ([0,1],[1,1])
Output: 6

Initial:
[ 0 0 0 ]
[ 0 0 0 ]

Apply [0,1]:
Increment row 0:
Before     After
[ 0 0 0 ]  [ 1 1 1 ]
[ 0 0 0 ]  [ 0 0 0 ]
Increment col 1:
Before     After
[ 1 1 1 ]  [ 1 2 1 ]
[ 0 0 0 ]  [ 0 1 0 ]

Apply [1,1]:
Increment row 1:
Before     After
[ 1 2 1 ]  [ 1 2 1 ]
[ 0 1 0 ]  [ 1 2 1 ]
Increment col 1:
Before     After
[ 1 2 1 ]  [ 1 3 1 ]
[ 1 2 1 ]  [ 1 3 1 ]

Final:
[ 1 3 1 ]
[ 1 3 1 ]

Example 2

Input: $row = 2, $col = 2, @locations = ([1,1],[0,0])
Output: 0

Initial:
[ 0 0 ]
[ 0 0 ]

Apply [1,1]:
Increment row 1:
Before    After
[ 0 0 ]   [ 0 0 ]
[ 0 0 ]   [ 1 1 ]
Increment col 1:
Before    After
[ 0 0 ]   [ 0 1 ]
[ 1 1 ]   [ 1 2 ]

Apply [0,0]:
Increment row 0:
Before    After
[ 0 1 ]   [ 1 2 ]
[ 1 2 ]   [ 1 2 ]
Increment col 0:
Before    After
[ 1 2 ]   [ 2 2 ]
[ 1 2 ]   [ 2 2 ]

Final:
[ 2 2 ]
[ 2 2 ]

Example 3

Input: $row = 3, $col = 3, @locations = ([0,0],[1,2],[2,1])
Output: 0

Initial:
[ 0 0 0 ]
[ 0 0 0 ]
[ 0 0 0 ]

Apply [0,0]:
Increment row 0:
Before     After
[ 0 0 0 ]  [ 1 1 1 ]
[ 0 0 0 ]  [ 0 0 0 ]
[ 0 0 0 ]  [ 0 0 0 ]
Increment col 0:
Before     After
[ 1 1 1 ]  [ 2 1 1 ]
[ 0 0 0 ]  [ 1 0 0 ]
[ 0 0 0 ]  [ 1 0 0 ]

Apply [1,2]:
Increment row 1:
Before     After
[ 2 1 1 ]  [ 2 1 1 ]
[ 1 0 0 ]  [ 2 1 1 ]
[ 1 0 0 ]  [ 1 0 0 ]
Increment col 2:
Before     After
[ 2 1 1 ]  [ 2 1 2 ]
[ 2 1 1 ]  [ 2 1 2 ]
[ 1 0 0 ]  [ 1 0 1 ]

Apply [2,1]:
Increment row 2:
Before     After
[ 2 1 2 ]  [ 2 1 2 ]
[ 2 1 2 ]  [ 2 1 2 ]
[ 1 0 1 ]  [ 2 1 2 ]
Increment col 1:
Before     After
[ 2 1 2 ]  [ 2 2 2 ]
[ 2 1 2 ]  [ 2 2 2 ]
[ 2 1 2 ]  [ 2 2 2 ]

Final:
[ 2 2 2 ]
[ 2 2 2 ]
[ 2 2 2 ]

Example 4

Input: $row = 1, $col = 5, @locations = ([0,2],[0,4])
Output: 2

Initial:
[ 0 0 0 0 0 ]

Apply [0,2]:
Increment row 0:
Before         After
[ 0 0 0 0 0 ]  [ 1 1 1 1 1 ]
Increment col 2:
Before         After
[ 1 1 1 1 1 ]  [ 1 1 2 1 1 ]

Apply [0,4]:
Increment row 0:
Before         After
[ 1 1 2 1 1 ]  [ 2 2 3 2 2 ]
Increment col 4:
Before         After
[ 2 2 3 2 2 ]  [ 2 2 3 2 3 ]

Final:
[ 2 2 3 2 3 ]

Example 5

Input: $row = 4, $col = 2, @locations = ([1,0],[3,1],[2,0],[0,1])
Output: 8

Initial:
[ 0 0 ]
[ 0 0 ]
[ 0 0 ]
[ 0 0 ]

Apply [1,0]:
Increment row 1:
Before     After
[ 0 0 ]    [ 0 0 ]
[ 0 0 ]    [ 1 1 ]
[ 0 0 ]    [ 0 0 ]
[ 0 0 ]    [ 0 0 ]
Increment col 0:
Before     After
[ 0 0 ]    [ 1 0 ]
[ 1 1 ]    [ 2 1 ]
[ 0 0 ]    [ 1 0 ]
[ 0 0 ]    [ 1 0 ]

Apply [3,1]:
Increment row 3:
Before     After
[ 1 0 ]    [ 1 0 ]
[ 2 1 ]    [ 2 1 ]
[ 1 0 ]    [ 1 0 ]
[ 1 0 ]    [ 2 1 ]
Increment col 1:
Before     After
[ 1 0 ]    [ 1 1 ]
[ 2 1 ]    [ 2 2 ]
[ 1 0 ]    [ 1 1 ]
[ 2 1 ]    [ 2 2 ]

Apply [2,0]:
Increment row 2:
Before     After
[ 1 1 ]    [ 1 1 ]
[ 2 2 ]    [ 2 2 ]
[ 1 1 ]    [ 2 2 ]
[ 2 2 ]    [ 2 2 ]
Increment col 0:
Before     After
[ 1 1 ]    [ 2 1 ]
[ 2 2 ]    [ 3 2 ]
[ 2 2 ]    [ 3 2 ]
[ 2 2 ]    [ 3 2 ]

Apply [0,1]:
Increment row 0:
Before     After
[ 2 1 ]    [ 3 2 ]
[ 3 2 ]    [ 3 2 ]
[ 3 2 ]    [ 3 2 ]
[ 3 2 ]    [ 3 2 ]
Increment col 1:
Before     After
[ 3 2 ]    [ 3 3 ]
[ 3 2 ]    [ 3 3 ]
[ 3 2 ]    [ 3 3 ]
[ 3 2 ]    [ 3 3 ]

Final:
[ 3 3 ]
[ 3 3 ]
[ 3 3 ]
[ 3 3 ]

Last date to submit the solution 23:59 (UK Time) Sunday 7th September 2025.