1 files changed, 11 insertions, 0 deletions
diff --git a/day23.ijs b/day23.ijs
new file mode 100644
index 0000000..0a58d46
--- /dev/null
+++ b/day23.ijs
@@ -0,0 +1,11 @@
+d =: 10 #.inv 158937462
+
+step =: 3 : 0
+'c h t' =. ({. ; }.@(4&{.) ; 4&}.) y
+'a b' =. t ({. ; }.)~ >: {. /: (|. (<:c) |. 1+i.9) i. t
+a,h,b,c
+)
+
+,":"0}.(]|.~I.@(1&=)) step^:100 d
+
+NB. part2 TBD