Merge pull request #2302 from choroba/echo078

Solve 078 Leader Element and Left Rotation by E. Choroba

2 files changed, 47 insertions, 0 deletions

diff --git a/challenge-078/e-choroba/perl/ch-1.pl b/challenge-078/e-choroba/perl/ch-1.pl
new file mode 100755
index 0000000000..ba8aac506b
--- /dev/null
+++ b/challenge-078/e-choroba/perl/ch-1.pl
@@ -0,0 +1,25 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+
+sub leader_element {
+    my ($list) = @_;
+    return [] unless @$list;
+
+    my @leaders = $list->[-1];
+    for my $n (reverse @$list) {
+        unshift @leaders, $n if $n > $leaders[0];
+    }
+
+    return \@leaders
+}
+
+use Test::More tests => 2;
+
+is_deeply leader_element([9, 10, 7, 5, 6, 1]),
+    [10, 7, 6, 1],
+    'example 1';
+
+is_deeply leader_element([3, 4, 5]),
+    [5],
+    'example 2';
diff --git a/challenge-078/e-choroba/perl/ch-2.pl b/challenge-078/e-choroba/perl/ch-2.pl
new file mode 100755
index 0000000000..606e94c2a6
--- /dev/null
+++ b/challenge-078/e-choroba/perl/ch-2.pl
@@ -0,0 +1,22 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+
+sub left_rotation {
+    my ($list, $rotations) = @_;
+    return [ map {
+        [ @$list[$_ .. $#$list], @$list[0 .. $_ - 1] ]
+    } @$rotations ]
+}
+
+use Test::More tests => 2;
+
+is_deeply left_rotation([10, 20, 30, 40, 50], [3, 4]),
+    [ [40, 50, 10, 20, 30],
+      [50, 10, 20, 30, 40] ];
+
+is_deeply left_rotation([ 7, 4, 2, 6, 3 ], [1, 3, 4]),
+    [ [ 4, 2, 6, 3, 7 ],
+      [ 6, 3, 7, 4, 2 ],
+      [ 3, 7, 4, 2, 6 ] ];
+