Merge pull request #12259 from boblied/w327

Week 327 solutions from Bob Lied

3 files changed, 164 insertions, 3 deletions

diff --git a/challenge-327/bob-lied/README.md b/challenge-327/bob-lied/README.md
index 7152e056f1..13e20a4e1e 100644
--- a/challenge-327/bob-lied/README.md
+++ b/challenge-327/bob-lied/README.md
@@ -1,4 +1,4 @@
-# Solutions to weekly challenge 326 by Bob Lied
+# Solutions to weekly challenge 327 by Bob Lied
 
-## [PWC](https://perlweeklychallenge.org/blog/perl-weekly-challenge-326/)
-## [GitHub](https://github.com/boblied/perlweeklychallenge-club/tree/master/challenge-326/bob-lied)
+## [PWC](https://perlweeklychallenge.org/blog/perl-weekly-challenge-327/)
+## [GitHub](https://github.com/boblied/perlweeklychallenge-club/tree/master/challenge-327/bob-lied)
diff --git a/challenge-327/bob-lied/perl/ch-1.pl b/challenge-327/bob-lied/perl/ch-1.pl
new file mode 100644
index 0000000000..812a04df22
--- /dev/null
+++ b/challenge-327/bob-lied/perl/ch-1.pl
@@ -0,0 +1,84 @@
+#!/usr/bin/env perl
+# vim:set ts=4 sw=4 sts=4 et ai wm=0 nu:
+#=============================================================================
+# Copyright (c) 2025, Bob Lied
+#=============================================================================
+# ch-1.pl Perl Weekly Challenge 327 Task 1  Missing Integers
+#=============================================================================
+# You are given an array of n integers.  Write a script to find all the
+# missing integers in the range 1..n in the given array.
+# Example 1 Input: @ints = (1, 2, 1, 3, 2, 5)
+#           Output: (4, 6)
+#   The given array has 6 elements.  So we are looking for integers in the
+#   range 1..6 in the given array.  The missing integers: (4, 6)
+# Example 2 Input: @ints = (1, 1, 1)
+#           Output: (2, 3)
+# Example 3 Input: @ints = (2, 2, 1)
+#           Output: (3)
+#=============================================================================
+
+use v5.40;
+
+
+use Getopt::Long;
+my $Verbose = false;
+my $DoTest  = false;
+my $Benchmark = 0;
+
+GetOptions("test" => \$DoTest, "verbose" => \$Verbose, "benchmark:i" => \$Benchmark);
+my $logger;
+{
+    use Log::Log4perl qw(:easy);
+    Log::Log4perl->easy_init({ level => ($Verbose ? $DEBUG : $INFO ),
+            layout => "%d{HH:mm:ss.SSS} %p{1} %m%n" });
+    $logger = Log::Log4perl->get_logger();
+}
+#=============================================================================
+
+exit(!runTest()) if $DoTest;
+exit( runBenchmark($Benchmark) ) if $Benchmark;
+
+say '(', join(', ', missing(@ARGV)), ')';
+
+#=============================================================================
+sub missing($ints)
+{
+    my @present = (true, (false) x @$ints);
+    $present[$_] = true for @$ints;
+    return [ grep { not $present[$_] } 1 .. $#present ];
+}
+
+sub missing_bv($ints)
+{
+    my $present = "";
+    vec($present, $_, 1) = 1 for 0, @$ints;
+    return [ grep { vec($present, $_, 1) == 0 } 1 .. @$ints ];
+}
+
+
+sub runTest
+{
+    use Test2::V0;
+
+    is( missing([1,2,1,3,2,5]), [4,6], "Example 1");
+    is( missing([1,1,1])      , [2,3], "Example 2");
+    is( missing([2,2,1])      , [3  ], "Example 3");
+
+    is( missing_bv([1,2,1,3,2,5]), [4,6], "Example 1");
+    is( missing_bv([1,1,1])      , [2,3], "Example 2");
+    is( missing_bv([2,2,1])      , [3  ], "Example 3");
+
+    done_testing;
+}
+
+sub runBenchmark($repeat)
+{
+    use Benchmark qw/cmpthese/;
+
+    my @ints = 1 .. 1000;
+    $ints[$_] = 1 for ( map { int(rand(1000)) } 1 .. 25 );
+    cmpthese($repeat, {
+            array  => sub { missing(\@ints) },
+            bitvec => sub { missing_bv(\@ints) },
+        });
+}
diff --git a/challenge-327/bob-lied/perl/ch-2.pl b/challenge-327/bob-lied/perl/ch-2.pl
new file mode 100644
index 0000000000..ab68f2ba37
--- /dev/null
+++ b/challenge-327/bob-lied/perl/ch-2.pl
@@ -0,0 +1,77 @@
+#!/usr/bin/env perl
+# vim:set ts=4 sw=4 sts=4 et ai wm=0 nu:
+#=============================================================================
+# Copyright (c) 2025, Bob Lied
+#=============================================================================
+# ch-2.pl Perl Weekly Challenge 327 Task 2  MAD
+#=============================================================================
+# You are given an array of distinct integers.  Write a script to find all
+# pairs of elements with minimum absolute difference (MAD) of any two elements.
+# Example 1 Input: @ints = (4, 1, 2, 3)
+#           Output: [1,2], [2,3], [3,4]
+#   The minimum absolute difference is 1.  Pairs with MAD: [1,2], [2,3], [3,4]
+# Example 2 Input: @ints = (1, 3, 7, 11, 15)
+#           Output: [1,3]
+# Example 3 Input: @ints = (1, 5, 3, 8)
+#           Output: [1,3], [3,5]
+#=============================================================================
+
+use v5.40;
+
+
+use Getopt::Long;
+my $Verbose = false;
+my $DoTest  = false;
+my $Benchmark = 0;
+
+GetOptions("test" => \$DoTest, "verbose" => \$Verbose, "benchmark:i" => \$Benchmark);
+my $logger;
+{
+    use Log::Log4perl qw(:easy);
+    Log::Log4perl->easy_init({ level => ($Verbose ? $DEBUG : $INFO ),
+            layout => "%d{HH:mm:ss.SSS} %p{1} %m%n" });
+    $logger = Log::Log4perl->get_logger();
+}
+#=============================================================================
+
+exit(!runTest()) if $DoTest;
+exit( runBenchmark($Benchmark) ) if $Benchmark;
+
+say join ", ", map { "[$_->[0],$_[1]]" } mad(@ARGV);
+
+#=============================================================================
+sub mad(@ints)
+{
+    use List::Util qw/max/;
+
+    my $mindiff = max @ints;
+    @ints = sort { $a <=> $b } @ints;
+    my @diff;
+    for my $i ( 1 .. $#ints )
+    {
+        my $d = $diff[$i] = abs( $ints[$i] - $ints[$i-1] );
+        $mindiff = $d if $d < $mindiff;
+    }
+    return [ map { [ $ints[$_-1], $ints[$_] ] }
+                grep { $diff[$_] == $mindiff } 1 .. $#ints ];
+}
+
+sub runTest
+{
+    use Test2::V0;
+
+    is( mad(4,1,2,3),     [ [1,2], [2,3], [3,4] ], "Example 1");
+    is( mad(1,3,7.11,15), [ [1,3]               ], "Example 2");
+    is( mad(1,5,3,8),     [ [1,3], [3,5]        ], "Example 3");
+
+    done_testing;
+}
+
+sub runBenchmark($repeat)
+{
+    use Benchmark qw/cmpthese/;
+
+    cmpthese($repeat, {
+            label => sub { },
+        });
+}