From c74daf4c04b5dd008a464b9ec05d3a836a512623 Mon Sep 17 00:00:00 2001
From: Luis Mochan <mochan@fis.unam.mx>
Date: Mon, 22 Apr 2024 09:31:18 -0600
Subject: Solve PWC266

---
 challenge-266/wlmb/blog.txt     |  1 +
 challenge-266/wlmb/perl/ch-1.pl | 15 +++++++++++++++
 challenge-266/wlmb/perl/ch-2.pl | 20 ++++++++++++++++++++
 3 files changed, 36 insertions(+)
 create mode 100644 challenge-266/wlmb/blog.txt
 create mode 100755 challenge-266/wlmb/perl/ch-1.pl
 create mode 100755 challenge-266/wlmb/perl/ch-2.pl

diff --git a/challenge-266/wlmb/blog.txt b/challenge-266/wlmb/blog.txt
new file mode 100644
index 0000000000..1c61a67b9e
--- /dev/null
+++ b/challenge-266/wlmb/blog.txt
@@ -0,0 +1 @@
+https://wlmb.github.io/2024/04/21/PWC266/
diff --git a/challenge-266/wlmb/perl/ch-1.pl b/challenge-266/wlmb/perl/ch-1.pl
new file mode 100755
index 0000000000..d86d47628d
--- /dev/null
+++ b/challenge-266/wlmb/perl/ch-1.pl
@@ -0,0 +1,15 @@
+#!/usr/bin/env perl
+# Perl weekly challenge 266
+# Task 1:  Uncommon Words
+#
+# See https://wlmb.github.io/2024/04/21/PWC266/#task-1-uncommon-words
+use v5.36;
+die <<~"FIN" unless @ARGV;
+    Usage: $0 S1 [S2...]
+    to find uncommon words in the strings S1, S2...
+    FIN
+my %count;
+$count{lc $_}++ for split /\W+/, "@ARGV";
+my @output=sort {$a cmp $b} grep {$count{$_}==1} keys %count;
+push @output, "''" unless @output;
+say join " ", map({"'".$_."'"} @ARGV), "->", @output;
diff --git a/challenge-266/wlmb/perl/ch-2.pl b/challenge-266/wlmb/perl/ch-2.pl
new file mode 100755
index 0000000000..7542b40e49
--- /dev/null
+++ b/challenge-266/wlmb/perl/ch-2.pl
@@ -0,0 +1,20 @@
+#!/usr/bin/env perl
+# Perl weekly challenge 266
+# Task 2:  X Matrix
+#
+# See https://wlmb.github.io/2024/04/21/PWC266/#task-2-x-matrix
+use v5.36;
+use PDL;
+use PDL::NiceSlice;
+die <<~"FIN" unless @ARGV;
+    Usage: $0 M1 [M2...]
+    to find out if the matrices M1, M2... are X shaped.
+    Each matrix should be of the form "[[M11 M12...][M21 M22...]...]"
+    where Mij are the matrix elements. Separating commas are optional.
+    FIN
+for(@ARGV){
+    my $matrix=pdl $_;
+    my $x=($matrix->xvals==$matrix->yvals) | ($matrix->xvals->(-1:0)==$matrix->yvals);
+    my $output=(!!$matrix == $x)->all?"True":"False";
+    say "$matrix -> $output";
+}
-- 
cgit