Week #159 solutions

2 files changed, 24 insertions, 0 deletions

diff --git a/challenge-159/2colours/raku/ch-1.raku b/challenge-159/2colours/raku/ch-1.raku
new file mode 100755
index 0000000000..07f037d7f0
--- /dev/null
+++ b/challenge-159/2colours/raku/ch-1.raku
@@ -0,0 +1,9 @@
+#!/usr/bin/env raku
+
+sub farey(Int() $n) {
+  my @rest = (([\,] (1..$n)) ZX/ (1..$n)).flat.unique.sort.map(*.nude.join: '/');
+  ('0/1', |@rest)
+}
+
+my $n = prompt 'Input: $n = ';
+say "Output: {farey($n).join(', ')}.";
\ No newline at end of file
diff --git a/challenge-159/2colours/raku/ch-2.raku b/challenge-159/2colours/raku/ch-2.raku
new file mode 100755
index 0000000000..e71d651672
--- /dev/null
+++ b/challenge-159/2colours/raku/ch-2.raku
@@ -0,0 +1,15 @@
+#!/usr/bin/env raku
+
+constant \minus-one = -1;
+
+multi möbius(1 --> 1) {}
+multi möbius($n where { .is-prime } --> minus-one) {}
+multi möbius($n) {
+  my $divisor = (2..^$n).first($n %% *);
+  my $quotient = $n div $divisor;
+  $quotient %% $divisor ?? 0 !!  möbius($divisor) * möbius($quotient)
+}
+
+
+my $n = prompt 'Input: $n = ';
+say "Output: {möbius($n)}";