From a16e084cd7b30c01b53ba846a263207f99d1d9c6 Mon Sep 17 00:00:00 2001
From: Lubos Kolouch <lubos@kolouch.net>
Date: Fri, 10 Apr 2020 19:35:17 +0200
Subject: Task 1 Perl LK

---
 challenge-055/lubos-kolouch/perl/ch-1.pl | 42 ++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 challenge-055/lubos-kolouch/perl/ch-1.pl

diff --git a/challenge-055/lubos-kolouch/perl/ch-1.pl b/challenge-055/lubos-kolouch/perl/ch-1.pl
new file mode 100644
index 0000000000..72c81ba0e0
--- /dev/null
+++ b/challenge-055/lubos-kolouch/perl/ch-1.pl
@@ -0,0 +1,42 @@
+##!/usr/bin/env perl
+
+use strict;
+use warnings;
+use Data::Dumper;
+use feature qw/say/;
+
+sub process_all_flips {
+    my $binary = shift;
+    my %all_results;
+
+    my $max = 0;
+
+    my @numbers = split //, $binary;
+
+    for my $l_count ( 0 .. scalar(@numbers)-1 ) {
+        for my $r_count ( $l_count .. scalar(@numbers)-1 ) {
+            my $inverted   = do_flip( $l_count, $r_count, $binary );
+            my $ones_count = () = $inverted =~ /1/gi;
+            push @{ $all_results{$ones_count} }, [ $l_count, $r_count ];
+            $max = $ones_count if $ones_count > $max;
+        }
+    }
+
+    return $all_results{$max};
+}
+
+sub do_flip {
+
+    my ( $l_count, $r_count, $input ) = @_;
+
+    my @binary = split //, $input;
+    
+    for my $str_pos ( $l_count .. $r_count ) {
+        $binary[$str_pos] = $binary[$str_pos] == 1 ? 0:1;
+    }
+
+    return join "", @binary;
+}
+
+my $result = process_all_flips("010");
+warn Dumper \$result;
-- 
cgit 


From e38c47dfecc6854b829238b5a8abaad40f11a00f Mon Sep 17 00:00:00 2001
From: Lubos Kolouch <lubos@kolouch.net>
Date: Fri, 10 Apr 2020 19:57:31 +0200
Subject: Task 2 Perl LK

---
 challenge-055/lubos-kolouch/perl/ch-2.pl | 50 ++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 challenge-055/lubos-kolouch/perl/ch-2.pl

diff --git a/challenge-055/lubos-kolouch/perl/ch-2.pl b/challenge-055/lubos-kolouch/perl/ch-2.pl
new file mode 100644
index 0000000000..d49b674046
--- /dev/null
+++ b/challenge-055/lubos-kolouch/perl/ch-2.pl
@@ -0,0 +1,50 @@
+##!/usr/bin/env perl
+
+use strict;
+use warnings;
+use Math::Combinatorics;
+use Data::Dumper;
+use feature qw/say/;
+
+sub process_all_waves {
+
+    my $arr_ref = shift;
+
+    my @result;
+
+    my $combinat = Math::Combinatorics->new(
+        count => scalar(@$arr_ref),
+        data  => [@$arr_ref],
+    );
+
+    while ( my @permu = $combinat->next_permutation ) {
+        push @result, \@permu if check_wave( \@permu );
+    }
+
+    return \@result;
+}
+
+sub check_wave {
+    my $perm_ref = shift;
+
+    # 1 = greater, -1 = smaller
+    my $direction = 1;
+
+    for ( 0 .. scalar(@$perm_ref) - 2 ) {
+        if ( $direction == 1 ) {
+            # stop if wave is broken
+            return 0 if $$perm_ref[$_] < $$perm_ref[ $_ + 1 ];
+        }
+        else {
+            return 0 if $$perm_ref[$_] > $$perm_ref[ $_ + 1 ];
+        }
+
+        $direction *= -1;
+    }
+
+    return 1;
+}
+
+my $all_waves = process_all_waves( [ 1, 2, 3, 4 ] );
+
+warn Dumper \$all_waves;
-- 
cgit