09b done

diff --git a/09/09b.bqn b/09/09b.bqn
new file mode 100644 (file)
index 0000000..f857c80
--- /dev/null
+++ b/09/09b.bqn
@@ -0,0 +1,16 @@
+Prep←{
+  directions←⍉['U'‿⟨0,1⟩,'D'‿⟨0,¯1⟩,'L'‿⟨¯1,0⟩,'R'‿⟨1,0⟩]
+  dirs←((⊏directions)⊐⊑¨𝕩)⊏(1⊏directions)
+  dists←{•ParseFloat 2↓𝕩}¨𝕩
+  dists/dirs
+}
+
+StepH←{h𝕊m:h+m}
+StepT←{t𝕊h:t+(×h-t)×(∨´1<|h-t)}
+
+Main←{
+  start←<⟨0,0⟩
+  +´∊ (start⊸(StepT`))⍟9 start StepH` 𝕩
+}
+
+•Show Main Prep •file.Lines ⊑•args