Raku week 117 task 2

1 files changed, 37 insertions, 0 deletions

diff --git a/challenge-117/luc65r/raku/ch-2.raku b/challenge-117/luc65r/raku/ch-2.raku
new file mode 100755
index 0000000000..f5ae5d6246
--- /dev/null
+++ b/challenge-117/luc65r/raku/ch-2.raku
@@ -0,0 +1,37 @@
+#!/usr/bin/env raku
+
+enum Move <H L R>;
+
+class Node {
+    also is Hash[Node, Move:D];
+
+    method dirs(Node:D: --> Iterable) {
+        gather {
+            for self.kv -> $k, $v {
+                with $v {
+                    my @d = .dirs;
+                    take $k ~ $_ for @d ?? @d !! '';
+                }
+            }
+        }
+    }
+}
+
+sub MAIN(UInt:D $size) {
+    my $top = construct-triangle($size);
+    .say for $top.dirs;
+}
+
+sub construct-triangle(UInt:D $size --> Node) {
+    my Node @line;
+    for $size … 0 -> $j {
+        for 0 .. $j -> $i {
+            @line[$i] = Node.new(
+                (H) => try { @line[$i - 1] },
+                (L) => @line[$i + 1],
+                (R) => @line[$i],
+            );
+        }
+    }
+    @line[0]
+}