Merge pull request #8973 from wlmb/challenges

Solve PWC241

3 files changed, 30 insertions, 0 deletions

diff --git a/challenge-241/wlmb/blog.txt b/challenge-241/wlmb/blog.txt
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+https://wlmb.github.io/2023/10/30/PWC241/
diff --git a/challenge-241/wlmb/perl/ch-1.pl b/challenge-241/wlmb/perl/ch-1.pl
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+#!/usr/bin/env perl
+# Perl weekly challenge 241
+# Task 1:  Arithmetic Triplets
+#
+# See https://wlmb.github.io/2023/10/30/PWC241/#task-1-arithmetic-triplets
+use v5.36;
+use List::Util qw(all);
+use Algorithm::Combinatorics qw(combinations);
+die <<~"FIN" if @ARGV<2;
+    Usage: $0 D N0 [N1...]
+    to count the triplets taken from N0 N1... with difference D between succesive terms;
+    FIN
+my $diff=shift;
+my @sorted=sort {$a <=> $b} @ARGV;
+die "Array should be ordered" unless all {$sorted[$_]==$ARGV[$_]} 0..@ARGV-1;
+say "Nums: @sorted, diff: $diff -> ",
+    0+grep{$_->[1]-$_->[0]==$_->[2]-$_->[1]==$diff} combinations([@sorted],3)
diff --git a/challenge-241/wlmb/perl/ch-2.pl b/challenge-241/wlmb/perl/ch-2.pl
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+#!/usr/bin/env perl
+# Perl weekly challenge 241
+# Task 2:  Prime Order
+#
+# See https://wlmb.github.io/2023/10/30/PWC241/#task-2-prime-order
+use v5.36;
+use Math::Prime::Util qw(factor);
+die <<~"FIN" unless @ARGV;
+    Usage: $0 N0 [N1...]
+    to order the numbers N0 N1 according to the number of factors and their value.
+    FIN
+say join " ", @ARGV, "->", sort{factor($a)<=>factor($b) || $a <=> $b} @ARGV