15a: input parsing

diff --git a/15/15a.bqn b/15/15a.bqn
new file mode 100644 (file)
index 0000000..b794dfe
--- /dev/null
+++ b/15/15a.bqn
@@ -0,0 +1,15 @@
+Split←{
+  blocknums ← +`𝕨
+  # Set entries in blocknums to -1 when they correspond with delimiters.
+  blocknums ↩ (¯1¨)⌾(𝕨⊸/) blocknums
+  blocknums⊔𝕩
+}
+
+Prep←{
+  words←' '⊸=⊸Split 𝕩
+  ⟨sx,sy,bx⟩←2↓¨¯1↓¨⟨2,3,8⟩⊏words
+  by←2↓9⊑words
+  •ParseFloat¨⟨sx,sy,bx,by⟩
+}
+
+•Show Prep¨ •file.Lines ⊑•args