From f795a520a8025e1b1f0569a8d0743061537a8d9c Mon Sep 17 00:00:00 2001
From: Packy Anderson <packy@cpan.org>
Date: Tue, 16 Sep 2025 23:28:22 -0400
Subject: Challenge 339 solutions by Packy Anderson

  * Raku that is finally Raku-ish
  * Perl
  * Python that kinda looks like Raku
  * Elixir that is starting to look like Elixir

1 blog post
---
 challenge-339/packy-anderson/README.md       |  2 +-
 challenge-339/packy-anderson/blog.txt        |  1 +
 challenge-339/packy-anderson/elixir/ch-1.exs | 30 ++++++++++++++++++++++
 challenge-339/packy-anderson/elixir/ch-2.exs | 34 +++++++++++++++++++++++++
 challenge-339/packy-anderson/perl/ch-1.pl    | 28 ++++++++++++++++++++
 challenge-339/packy-anderson/perl/ch-2.pl    | 29 +++++++++++++++++++++
 challenge-339/packy-anderson/python/ch-1.py  | 29 +++++++++++++++++++++
 challenge-339/packy-anderson/python/ch-2.py  | 38 ++++++++++++++++++++++++++++
 challenge-339/packy-anderson/raku/ch-1.raku  | 28 ++++++++++++++++++++
 challenge-339/packy-anderson/raku/ch-2.raku  | 28 ++++++++++++++++++++
 10 files changed, 246 insertions(+), 1 deletion(-)
 create mode 100644 challenge-339/packy-anderson/blog.txt
 create mode 100755 challenge-339/packy-anderson/elixir/ch-1.exs
 create mode 100755 challenge-339/packy-anderson/elixir/ch-2.exs
 create mode 100755 challenge-339/packy-anderson/perl/ch-1.pl
 create mode 100755 challenge-339/packy-anderson/perl/ch-2.pl
 create mode 100755 challenge-339/packy-anderson/python/ch-1.py
 create mode 100755 challenge-339/packy-anderson/python/ch-2.py
 create mode 100755 challenge-339/packy-anderson/raku/ch-1.raku
 create mode 100755 challenge-339/packy-anderson/raku/ch-2.raku

diff --git a/challenge-339/packy-anderson/README.md b/challenge-339/packy-anderson/README.md
index 28dc9f720c..1013ff24f7 100644
--- a/challenge-339/packy-anderson/README.md
+++ b/challenge-339/packy-anderson/README.md
@@ -23,4 +23,4 @@
 
 ## Blog Post
 
-[Perl Weekly Challenge: Maxwell's Silver Highest](https://packy.dardan.com/b/b0)
+[Perl Weekly Challenge: Points? What's the diff?](https://packy.dardan.com/b/bN)
diff --git a/challenge-339/packy-anderson/blog.txt b/challenge-339/packy-anderson/blog.txt
new file mode 100644
index 0000000000..3094ad33e7
--- /dev/null
+++ b/challenge-339/packy-anderson/blog.txt
@@ -0,0 +1 @@
+https://packy.dardan.com/b/bN
\ No newline at end of file
diff --git a/challenge-339/packy-anderson/elixir/ch-1.exs b/challenge-339/packy-anderson/elixir/ch-1.exs
new file mode 100755
index 0000000000..97edb4ed54
--- /dev/null
+++ b/challenge-339/packy-anderson/elixir/ch-1.exs
@@ -0,0 +1,30 @@
+#!/usr/bin/env elixir
+
+defmodule PWC do
+  def max_diff(ints) do
+    ints = Enum.sort(ints, &(abs(&1) <= abs(&2)))
+    {a, b} = {Enum.at(ints,  0), Enum.at(ints,  1)}
+    {c, d} = {Enum.at(ints, -2), Enum.at(ints, -1)}
+    abs((a * b) - (c * d))
+  end
+
+  def solution(ints) do
+    IO.puts("Input: @ints = (" <> Enum.join(ints, ", ") <> ")")
+    IO.puts("Output: #{max_diff(ints)}")
+  end
+end
+
+IO.puts("Example 1:")
+PWC.solution([5, 9, 3, 4, 6])
+
+IO.puts("\nExample 2:")
+PWC.solution([1, -2, 3, -4])
+
+IO.puts("\nExample 3:")
+PWC.solution([-3, -1, -2, -4])
+
+IO.puts("\nExample 4:")
+PWC.solution([10, 2, 0, 5, 1])
+
+IO.puts("\nExample 5:")
+PWC.solution([7, 8, 9, 10, 10])
diff --git a/challenge-339/packy-anderson/elixir/ch-2.exs b/challenge-339/packy-anderson/elixir/ch-2.exs
new file mode 100755
index 0000000000..271002bd5a
--- /dev/null
+++ b/challenge-339/packy-anderson/elixir/ch-2.exs
@@ -0,0 +1,34 @@
+#!/usr/bin/env elixir
+
+defmodule PWC do
+  def add_max(x, {sum, max}) do
+    sum = sum + x
+    max = Enum.max([max, sum])
+    { x, {sum, max} }
+  end
+
+  def peak_point(gain) do
+    {_, {_, max}} = Enum.map_reduce(gain, {0, 0}, &add_max/2)
+    max
+  end
+
+  def solution(gain) do
+    IO.puts("Input: @gain = (" <> Enum.join(gain, ", ") <> ")")
+    IO.puts("Output: #{peak_point(gain)}")
+  end
+end
+
+IO.puts("Example 1:")
+PWC.solution([-5, 1, 5, -9, 2])
+
+IO.puts("\nExample 2:")
+PWC.solution([10, 10, 10, -25])
+
+IO.puts("\nExample 3:")
+PWC.solution([3, -4, 2, 5, -6, 1])
+
+IO.puts("\nExample 4:")
+PWC.solution([-1, -2, -3, -4])
+
+IO.puts("\nExample 5:")
+PWC.solution([-10, 15, 5])
diff --git a/challenge-339/packy-anderson/perl/ch-1.pl b/challenge-339/packy-anderson/perl/ch-1.pl
new file mode 100755
index 0000000000..f697645a51
--- /dev/null
+++ b/challenge-339/packy-anderson/perl/ch-1.pl
@@ -0,0 +1,28 @@
+#!/usr/bin/env perl
+use v5.40;
+
+sub maxDiff(@ints) {
+  my ($A, $B, $C, $D) =
+    +(sort { abs($a) <=> abs($b) } @ints)[0, 1, -2, -1];
+  abs(($A * $B) - ($C * $D))
+}
+
+sub solution($ints) {
+  say 'Input: @ints = (' . join(', ', @$ints) . ')';
+  say 'Output: ' . maxDiff(@$ints);
+}
+
+say "Example 1:";
+solution([5, 9, 3, 4, 6]);
+
+say "\nExample 2:";
+solution([1, -2, 3, -4]);
+
+say "\nExample 3:";
+solution([-3, -1, -2, -4]);
+
+say "\nExample 4:";
+solution([10, 2, 0, 5, 1]);
+
+say "\nExample 5:";
+solution([7, 8, 9, 10, 10]);
diff --git a/challenge-339/packy-anderson/perl/ch-2.pl b/challenge-339/packy-anderson/perl/ch-2.pl
new file mode 100755
index 0000000000..ef39719bea
--- /dev/null
+++ b/challenge-339/packy-anderson/perl/ch-2.pl
@@ -0,0 +1,29 @@
+#!/usr/bin/env perl
+use v5.40;
+
+use List::AllUtils qw( max reductions );
+
+sub peakPoint(@gain) {
+  max reductions { $a + $b } 0, @gain;
+}
+
+sub solution($gain) {
+  say 'Input: @gain = (' . join(', ', @$gain) . ')';
+  say 'Output: ' . peakPoint(@$gain);
+}
+
+say "Example 1:";
+solution([-5, 1, 5, -9, 2]);
+
+say "\nExample 2:";
+solution([10, 10, 10, -25]);
+
+say "\nExample 3:";
+solution([3, -4, 2, 5, -6, 1]);
+
+say "\nExample 4:";
+solution([-1, -2, -3, -4]);
+
+say "\nExample 5:";
+solution([-10, 15, 5]);
+
diff --git a/challenge-339/packy-anderson/python/ch-1.py b/challenge-339/packy-anderson/python/ch-1.py
new file mode 100755
index 0000000000..4338ed01c4
--- /dev/null
+++ b/challenge-339/packy-anderson/python/ch-1.py
@@ -0,0 +1,29 @@
+#!/usr/bin/env python
+
+def max_diff(ints):
+  ints = sorted(ints, key=abs)
+  a, b = ints[0:2]
+  c, d = ints[-2:]
+  return abs((a * b) - (c * d))
+
+def int_join(joiner, arr):
+  return joiner.join(map(lambda i: str(i), arr))
+
+def solution(ints):
+  print(f'Input: @ints = ({int_join(", ", ints)})')
+  print(f'Output: {max_diff(ints)}')
+
+print('Example 1:')
+solution([5, 9, 3, 4, 6])
+
+print('\nExample 2:')
+solution([1, -2, 3, -4])
+
+print('\nExample 3:')
+solution([-3, -1, -2, -4])
+
+print('\nExample 4:')
+solution([10, 2, 0, 5, 1])
+
+print('\nExample 5:')
+solution([7, 8, 9, 10, 10])
diff --git a/challenge-339/packy-anderson/python/ch-2.py b/challenge-339/packy-anderson/python/ch-2.py
new file mode 100755
index 0000000000..0387ea2f4e
--- /dev/null
+++ b/challenge-339/packy-anderson/python/ch-2.py
@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+
+from functools import reduce
+
+from functools import reduce
+
+def add_max(x, y):
+  global max_alt
+  max_alt = max(max_alt, x+y)
+  return x+y
+
+def peak_point(gain):
+  global max_alt
+  max_alt = 0 # initialize global to 0
+  reduce(add_max, gain)
+  return max_alt
+
+def int_join(joiner, arr):
+  return joiner.join(map(lambda i: str(i), arr))
+
+def solution(gain):
+  print(f'Input: @gain = ({int_join(", ", gain)})')
+  print(f'Output: {peak_point(gain)}')
+
+print('Example 1:')
+solution([-5, 1, 5, -9, 2])
+
+print('\nExample 2:')
+solution([10, 10, 10, -25])
+
+print('\nExample 3:')
+solution([3, -4, 2, 5, -6, 1])
+
+print('\nExample 4:')
+solution([-1, -2, -3, -4])
+
+print('\nExample 5:')
+solution([-10, 15, 5])
diff --git a/challenge-339/packy-anderson/raku/ch-1.raku b/challenge-339/packy-anderson/raku/ch-1.raku
new file mode 100755
index 0000000000..694ca97147
--- /dev/null
+++ b/challenge-339/packy-anderson/raku/ch-1.raku
@@ -0,0 +1,28 @@
+#!/usr/bin/env raku
+use v6;
+
+sub maxDiff(@ints is copy) {
+  my ($a, $b, $c, $d) =
+    @ints.sort({ abs($^a) cmp abs($^b) })[0, 1, *-2, *-1];
+  abs(($a * $b) - ($c * $d))
+}
+
+sub solution(@ints) {
+  say 'Input: @ints = (' ~ @ints.join(', ') ~ ')';
+  say 'Output: ' ~ maxDiff(@ints);
+}
+
+say "Example 1:";
+solution([5, 9, 3, 4, 6]);
+
+say "\nExample 2:";
+solution([1, -2, 3, -4]);
+
+say "\nExample 3:";
+solution([-3, -1, -2, -4]);
+
+say "\nExample 4:";
+solution([10, 2, 0, 5, 1]);
+
+say "\nExample 5:";
+solution([7, 8, 9, 10, 10]);
diff --git a/challenge-339/packy-anderson/raku/ch-2.raku b/challenge-339/packy-anderson/raku/ch-2.raku
new file mode 100755
index 0000000000..fd804250a4
--- /dev/null
+++ b/challenge-339/packy-anderson/raku/ch-2.raku
@@ -0,0 +1,28 @@
+#!/usr/bin/env raku
+use v6;
+
+sub peakPoint(@gain) {
+  my $max = 0; # we start at 0
+  @gain.reduce({ my $s = $^a + $^b; $max = max($max, $s); $s });
+  $max;
+}
+
+sub solution(@gain) {
+  say 'Input: @gain = (' ~ @gain.join(', ') ~ ')';
+  say 'Output: ' ~ peakPoint(@gain);
+}
+
+say "Example 1:";
+solution([-5, 1, 5, -9, 2]);
+
+say "\nExample 2:";
+solution([10, 10, 10, -25]);
+
+say "\nExample 3:";
+solution([3, -4, 2, 5, -6, 1]);
+
+say "\nExample 4:";
+solution([-1, -2, -3, -4]);
+
+say "\nExample 5:";
+solution([-10, 15, 5]);
-- 
cgit 


From f97ddcbc990cdd2e4084608d3f198786385f3ca5 Mon Sep 17 00:00:00 2001
From: Packy Anderson <packy@cpan.org>
Date: Tue, 16 Sep 2025 23:35:54 -0400
Subject: Remove duplicated line.

---
 challenge-339/packy-anderson/python/ch-2.py | 2 --
 1 file changed, 2 deletions(-)

diff --git a/challenge-339/packy-anderson/python/ch-2.py b/challenge-339/packy-anderson/python/ch-2.py
index 0387ea2f4e..91ddbc0ff1 100755
--- a/challenge-339/packy-anderson/python/ch-2.py
+++ b/challenge-339/packy-anderson/python/ch-2.py
@@ -2,8 +2,6 @@
 
 from functools import reduce
 
-from functools import reduce
-
 def add_max(x, y):
   global max_alt
   max_alt = max(max_alt, x+y)
-- 
cgit