Merge pull request #478 from choroba/ech20

Add solutions to 020 by E. Choroba

2 files changed, 31 insertions, 0 deletions

diff --git a/challenge-020/e-choroba/perl5/ch-1.pl b/challenge-020/e-choroba/perl5/ch-1.pl
new file mode 100755
index 0000000000..f0c351f239
--- /dev/null
+++ b/challenge-020/e-choroba/perl5/ch-1.pl
@@ -0,0 +1,14 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+use feature qw{ say };
+
+sub split_on_change {
+    my ($string) = @_;
+    my $i;
+    grep ++$i % 2, $string =~ /((.)\2*)/g
+}
+
+use Test::More tests => 1;
+is_deeply [split_on_change('ABBCDEEF')],
+          [qw[ A BB C D EE F ]];
diff --git a/challenge-020/e-choroba/perl5/ch-2.pl b/challenge-020/e-choroba/perl5/ch-2.pl
new file mode 100755
index 0000000000..4e17ef1186
--- /dev/null
+++ b/challenge-020/e-choroba/perl5/ch-2.pl
@@ -0,0 +1,17 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+use feature qw(say);
+
+use List::Util qw{ sum0 };
+
+sub sum_divisors {
+    my $n = shift;
+    return sum0(grep 0 == $n % $_, 1 .. $n - 1)
+}
+
+my ($a1, $a2) = (0, 0);
+until ($a1 == sum_divisors($a2) && $a1 < $a2) {
+    $a2 = sum_divisors(++$a1);
+}
+say "$a1 $a2";