solution 159-1

1 files changed, 25 insertions, 0 deletions

diff --git a/challenge-159/wambash/raku/ch-1.raku b/challenge-159/wambash/raku/ch-1.raku
new file mode 100644
index 0000000000..8d2b1c0c5e
--- /dev/null
+++ b/challenge-159/wambash/raku/ch-1.raku
@@ -0,0 +1,25 @@
+#!/usr/bin/env raku
+
+sub farrey-sequence ($n) {
+    1..$n
+    andthen .combinations(2)
+    andthen .map: { [/] $_ }\
+    andthen 0/1,|.sort, 1/1
+    andthen .squish
+}
+
+multi MAIN (Bool :test($)!) {
+    use Test;
+    is farrey-sequence(2), (0/1, 1/2, 1/1);
+    is farrey-sequence(5), (0/1, 1/5, 1/4, 1/3, 2/5, 1/2, 3/5, 2/3, 3/4, 4/5, 1/1);
+    is farrey-sequence(7), (0/1, 1/7, 1/6, 1/5, 1/4, 2/7, 1/3, 2/5, 3/7, 1/2, 4/7, 3/5, 2/3, 5/7, 3/4, 4/5, 5/6, 6/7, 1/1);
+    is farrey-sequence(4), (0/1, 1/4, 1/3, 1/2, 2/3, 3/4, 1/1);
+    done-testing;
+}
+
+multi MAIN (UInt $n) {
+    farrey-sequence $n
+    andthen .map: *.nude
+    andthen .map: *.fmt: '%d','/'
+    andthen .put
+}