21a done

diff --git a/21/21a.bqn b/21/21a.bqn
new file mode 100644 (file)
index 0000000..37e6e06
--- /dev/null
+++ b/21/21a.bqn
@@ -0,0 +1,19 @@
+Prep←{
+  17=≠𝕩 ? (⋈⚇0⟨↕4,6+↕4,11,13+↕4⟩)⊑𝕩;
+  ⟨(↕4)⊏𝕩,•ParseFloat 6↓𝕩⟩
+}¨
+
+Main←{
+  monkeys←⟨⟩•HashMap⟨⟩
+  Monkey←{
+    𝕊⟨name, number⟩: name monkeys.Set number;
+    𝕊⟨name, x, opcode, y⟩:
+      op←⊑("+-*/"⊐opcode)⊏⟨+,-,×,÷⟩
+      Fn←{𝕤, ((monkeys.Get x){𝔽} @) Op ((monkeys.Get y){𝔽} @) }
+      name monkeys.Set fn
+  }
+  Monkey¨𝕩
+  (monkeys.Get "root"){𝔽} @
+}
+
+•Show Main Prep •file.Lines ⊑•args