From e37109184bfd7b9a104f409aa9fb780e0079dc49 Mon Sep 17 00:00:00 2001
From: "Jaldhar H. Vyas" <jaldhar@braincells.com>
Date: Mon, 15 Jul 2024 18:49:14 -0400
Subject: Challenge 121 part 2 by Jaldhar H. Vyas.

---
 challenge-121/jaldhar-h-vyas/perl/ch-2.pl   | 42 +++++++++++++++++++++++++++++
 challenge-121/jaldhar-h-vyas/raku/ch-2.raku | 29 ++++++++++++++++++++
 2 files changed, 71 insertions(+)
 create mode 100755 challenge-121/jaldhar-h-vyas/perl/ch-2.pl
 create mode 100755 challenge-121/jaldhar-h-vyas/raku/ch-2.raku

diff --git a/challenge-121/jaldhar-h-vyas/perl/ch-2.pl b/challenge-121/jaldhar-h-vyas/perl/ch-2.pl
new file mode 100755
index 0000000000..e485088df4
--- /dev/null
+++ b/challenge-121/jaldhar-h-vyas/perl/ch-2.pl
@@ -0,0 +1,42 @@
+#!/usr/bin/perl
+use v5.38;
+
+sub permute :prototype(&@) {
+    my $code = shift;
+    my @idx = 0..$#_;
+    while ( $code->(@_[@idx]) ) {
+        my $p = $#idx;
+        --$p while $idx[$p-1] > $idx[$p];
+        my $q = $p or return;
+        push @idx, reverse splice @idx, $p;
+        ++$q while $idx[$p-1] > $idx[$q];
+        @idx[$p-1,$q]=@idx[$q,$p-1];
+    }
+}
+
+my @matrix = map { [ split /\s+/, $_ ] } @ARGV;
+my $minimumLength = "Inf";
+my @tour = ();
+
+my @permutations;
+permute { push @permutations, \@_; } keys @{$matrix[0]};
+
+for my $perm (@permutations) {
+    my $cost = 0;
+    my $from = 0;
+
+    my @cities = grep { $_ != 0} @{$perm};
+    for my $i (keys @cities) {
+        $cost += $matrix[$from]->[$cities[$i]];
+        $from = $cities[$i];
+    }
+    $cost += $matrix[$from]->[0];
+
+    if ($cost < $minimumLength) {
+        $minimumLength = $cost;
+        @tour = @cities;
+    }
+}
+
+say "length = $minimumLength";
+say 'tour = (0 ', (join q{ }, @tour), ' 0)'; 
\ No newline at end of file
diff --git a/challenge-121/jaldhar-h-vyas/raku/ch-2.raku b/challenge-121/jaldhar-h-vyas/raku/ch-2.raku
new file mode 100755
index 0000000000..78d2b4e995
--- /dev/null
+++ b/challenge-121/jaldhar-h-vyas/raku/ch-2.raku
@@ -0,0 +1,29 @@
+#!/usr/bin/raku
+
+sub MAIN(
+    *@args
+) {
+    my @matrix = @args.map({ [$_.words] });
+    my $minimumLength = ∞;
+    my @tour = ();
+    for (@matrix[0].keys).permutations -> $perm {
+        my $cost = 0;
+        my $from = 0;
+
+        my @cities = @$perm.grep({ $_ != 0});
+        for @cities.keys -> $i {
+            $cost += @matrix[$from;@cities[$i]];
+            $from = @cities[$i];
+        }
+        $cost += @matrix[$from;0];
+
+        if $cost < $minimumLength {
+            $minimumLength = $cost;
+            @tour = @cities;
+        }
+    }
+
+    say "length = $minimumLength";
+    say 'tour = (0 ', @tour.join(q{ }), ' 0)'; 
+}
+
-- 
cgit