1 files changed, 20 insertions, 0 deletions
diff --git a/day15.ijs b/day15.ijs
new file mode 100644
index 0000000..81aac36
--- /dev/null
+++ b/day15.ijs
@@ -0,0 +1,20 @@
+d =: 5 2 8 16 18 0 1
+
+h =: 3 : 0
+if. 1 = #y do.
+  0
+else.
+  --/ _2 {. y
+end.
+)
+
+part1 =: 3 : 0
+for. i. 2020 do.
+  d =: d,h I. d = {:d
+end.
+2019 { d
+)
+
+part1''  NB. 517
+
+NB. part2 tbd