3 files changed, 55 insertions, 0 deletions
diff --git a/challenge-013/lakpatashi/README b/challenge-013/lakpatashi/README
new file mode 100644
index 0000000000..bc153bd576
--- /dev/null
+++ b/challenge-013/lakpatashi/README
@@ -0,0 +1 @@
+Solution by lakpatashi
diff --git a/challenge-013/lakpatashi/perl/ch-1.pl b/challenge-013/lakpatashi/perl/ch-1.pl
new file mode 100755
index 0000000000..e728f5076e
--- /dev/null
+++ b/challenge-013/lakpatashi/perl/ch-1.pl
@@ -0,0 +1,31 @@
+#!/usr/bin/perl
+
+use warnings;
+use strict;
+use Data::Dumper;
+use List::Util qw(sum);
+use feature qw(switch);
+
+#part 1
+use Time::Local qw();
+
+my $year = 2012;
+for my $month (1..12){
+	# 5 is friday
+	printf "%.4d-%.2d-%.2d\n",$year,$month,last_dow_month($year,$month,5);
+}
+
+sub last_dow_month{
+	# 0 <= month <= 11
+	my ($year, $month, $dow) = @_;
+	$year += int ($month/12);
+	$month %= 12;
+
+	# 1 day = 86400 sec
+	my $time = Time::Local::timegm(0,0,0,1,$month,$year)-86400;
+	my ($mday,$wday) = (gmtime($time))[3,6];
+	return $mday - ($wday - $dow) % 7;
+}
+
+
+
diff --git a/challenge-013/lakpatashi/perl/ch-2.pl b/challenge-013/lakpatashi/perl/ch-2.pl
new file mode 100755
index 0000000000..47d9a19d48
--- /dev/null
+++ b/challenge-013/lakpatashi/perl/ch-2.pl
@@ -0,0 +1,23 @@
+#!/usr/bin/perl
+
+use warnings;
+use strict;
+use Data::Dumper;
+use List::Util qw(sum);
+use feature qw(switch);
+
+#part 2
+sub F{
+	my $n = shift;
+	return $n<=0? 1: $n - M(F($n-1));
+}
+
+sub M{
+	my $n = shift;
+	return $n<=0? 0: $n - F(M($n-1));
+}
+
+print "i\tF(i)\tM(i)\n";
+for my $i (0..10){
+	print $i,"\t",F($i),"\t",M($i),"\n";
+}