Week 266 solutions

3 files changed, 175 insertions, 3 deletions

diff --git a/challenge-266/bob-lied/README b/challenge-266/bob-lied/README
index 3267f8159b..e17c006f30 100644
--- a/challenge-266/bob-lied/README
+++ b/challenge-266/bob-lied/README
@@ -1,4 +1,4 @@
-Solutions to weekly challenge 264 by Bob Lied
+Solutions to weekly challenge 266 by Bob Lied
 
-https://perlweeklychallenge.org/blog/perl-weekly-challenge-264/
-https://github.com/boblied/perlweeklychallenge-club/tree/master/challenge-264/bob-lied
+https://perlweeklychallenge.org/blog/perl-weekly-challenge-266/
+https://github.com/boblied/perlweeklychallenge-club/tree/master/challenge-266/bob-lied
diff --git a/challenge-266/bob-lied/perl/ch-1.pl b/challenge-266/bob-lied/perl/ch-1.pl
new file mode 100644
index 0000000000..4b7f251356
--- /dev/null
+++ b/challenge-266/bob-lied/perl/ch-1.pl
@@ -0,0 +1,58 @@
+#!/usr/bin/env perl
+# vim:set ts=4 sw=4 sts=4 et ai wm=0 nu:
+#=============================================================================
+# Copyright (c) 2024, Bob Lied
+#=============================================================================
+# ch-1.pl Perl Weekly Challenge 266 Task 1 Uncommon Words
+#=============================================================================
+# You are given two sentences, $line1 and $line2.
+# Write a script to find all uncommmon words in any order in the given two
+# sentences. Return ('') if none found.
+# A word is uncommon if it appears exactly once in one of the sentences
+# and doesn’t appear in other sentence.
+# Example 1 Input: $line1 = 'Mango is sweet'
+#                  $line2 = 'Mango is sour'
+#           Output: ('sweet', 'sour')
+# Example 2 Input: $line1 = 'Mango Mango'
+#                  $line2 = 'Orange'
+#           Output: ('Orange')
+# Example 3 Input: $line1 = 'Mango is Mango'
+#                  $line2 = 'Orange is Orange'
+#           Output: ('')
+#=============================================================================
+
+use v5.38;
+
+use builtin qw/true false trim/; no warnings "experimental::builtin";
+
+use Getopt::Long;
+my $Verbose = 0;
+my $DoTest  = 0;
+
+GetOptions("test" => \$DoTest, "verbose" => \$Verbose);
+exit(!runTest()) if $DoTest;
+
+say "(", join(", ", map { "'$_'" } uncommon(@ARGV)->@* ), ")";
+
+
+sub uncommon(@sentenceList)
+{
+    use Text::ParseWords;
+    use List::MoreUtils qw/frequency/;
+    my @words = grep { defined } quotewords( '\W+', false, @sentenceList);
+
+    my %freq = frequency(@words);
+    my @uncommon = grep { $freq{$_} == 1 } keys %freq;
+    return @uncommon ? [  sort @uncommon ] : [ '' ];
+}
+
+sub runTest
+{
+    use Test2::V0;
+
+    is( uncommon("Mango is sweet", "Mango is sour"), [ qw(sour sweet) ], "Example 1");
+    is( uncommon("Mango Mango", "Orange"), [ 'Orange' ], "Example 2");
+    is( uncommon("Mango is Mango", "Orange is Orange"), [ '' ], "Example 3");
+
+    done_testing;
+}
diff --git a/challenge-266/bob-lied/perl/ch-2.pl b/challenge-266/bob-lied/perl/ch-2.pl
new file mode 100644
index 0000000000..8742bf1d1c
--- /dev/null
+++ b/challenge-266/bob-lied/perl/ch-2.pl
@@ -0,0 +1,114 @@
+#!/usr/bin/env perl
+# vim:set ts=4 sw=4 sts=4 et ai wm=0 nu:
+#=============================================================================
+# Copyright (c) 2024, Bob Lied
+#=============================================================================
+# ch-2.pl Perl Weekly Challenge 266 Task 2 X Matrix
+#=============================================================================
+# You are given a square matrix, $matrix.
+# Write a script to find if the given matrix is X Matrix.
+# A square matrix is an X Matrix if all the elements on the main diagonal
+# and antidiagonal are non-zero and everything else are zero.
+#
+# Example 1 Input: $matrix = [ [1, 0, 0, 2],
+#                              [0, 3, 4, 0],
+#                              [0, 5, 6, 0],
+#                              [7, 0, 0, 1], ]
+#           Output: true
+# Example 2 Input: $matrix = [ [1, 2, 3],
+#                              [4, 5, 6],
+#                              [7, 8, 9], ]
+#           Output: false
+# Example 3 Input: $matrix = [ [1, 0, 2],
+#                              [0, 3, 0],
+#                              [4, 0, 5], ]
+#           Output: true
+#=============================================================================
+
+use v5.38;
+
+use builtin qw/true false/; no warnings "experimental::builtin";
+
+use Getopt::Long;
+my $Verbose = 0;
+my $DoTest  = 0;
+
+GetOptions("test" => \$DoTest, "verbose" => \$Verbose);
+exit(!runTest()) if $DoTest;
+
+use List::Util qw/all/;
+sub isZero(@elem)    { return all { $_ == 0 } @elem; }
+sub isNonZero(@elem) { return all { $_ != 0 } @elem; }
+
+# Exploit the symmetry. Given $r and $c in one quadrant, return
+# the four values from all four quadrants
+sub symElem($m, $end, $r, $c)
+{
+    return ( $m->[$r][$c],
+             $m->[$r][$end - $c],
+             $m->[$end - $r][$c],
+             $m->[$end - $r][$end - $c] )
+}
+
+sub xmatrix($matrix)
+{
+    my $end = $matrix->[0]->$#*;
+    my $mid  = int($end / 2);
+
+    my $isX = true;
+    for my $r ( 0 .. $mid )
+    {
+        for my $c ( 0 .. $mid )
+        {
+            $isX &&= ( $r == $c )
+                     ? isNonZero( symElem($matrix, $end, $r, $c) )
+                     : isZero(    symElem($matrix, $end, $r, $c) )
+                     ;
+        }
+    }
+    return $isX;
+}
+
+sub runTest
+{
+    use Test2::V0;
+use builtin qw/true false/; no warnings "experimental::builtin";
+
+    my $matrix;
+
+    $matrix = [ [1, 0, 0, 2],
+                [0, 3, 4, 0],
+                [0, 5, 6, 0],
+                [7, 0, 0, 1], ];
+    is(xmatrix($matrix), true, "Example 1");
+
+    $matrix = [ [1, 2, 3],
+                [4, 5, 6],
+                [7, 8, 9], ];
+    is(xmatrix($matrix), false, "Example 2");
+
+    $matrix = [ [1, 0, 2],
+                [0, 3, 0],
+                [4, 0, 5], ];
+    is(xmatrix($matrix), true, "Example 3");
+
+    $matrix = [ [0, 0, 2],
+                [0, 3, 0],
+                [4, 0, 5], ];
+    is(xmatrix($matrix), false, "Example 3 but false");
+
+    $matrix = [ [1, 2],
+                [3, 4], ];
+    is(xmatrix($matrix), true, "2x2 true");
+
+    $matrix = [ [1, 0],
+                [3, 4], ];
+    is(xmatrix($matrix), false, "2x2 false");
+
+    $matrix = [ [1] ];
+    is(xmatrix($matrix), true, "1x1 true");
+    $matrix = [ [0] ];
+    is(xmatrix($matrix), false, "1x1 false");
+
+    done_testing;
+}