From 9980a8d26d01c1b4d11595db1ba6301d8d98ab73 Mon Sep 17 00:00:00 2001
From: Jay Foad <jay.foad@gmail.com>
Date: Fri, 21 Dec 2018 09:40:04 +0000
Subject: [PATCH] Day 21 solution.

---
 p21.dyalog |  7 +++++++
 p21.txt    | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)
 create mode 100644 p21.dyalog
 create mode 100644 p21.txt

diff --git a/p21.dyalog b/p21.dyalog
new file mode 100644
index 0000000..989af85
--- /dev/null
+++ b/p21.dyalog
@@ -0,0 +1,7 @@
+⎕IO←0
+p←⊃⎕NGET'p21.txt'1
+input←⍎⊃'\d+'⎕S'&'⊢8⊃p
+f←{16777216|65899×16777216|⍵+⍺}
+g←{p q r←256 256 256⊤⍵ ⋄ (p+~2|p) f q f r f input}
+g 0 ⍝ part 1
+z←⍬ ⋄ {⍵∊z:⊃⌽z ⋄ z,←⍵ ⋄ ∇g ⍵}0 ⍝ part 2
diff --git a/p21.txt b/p21.txt
new file mode 100644
index 0000000..6c7f021
--- /dev/null
+++ b/p21.txt
@@ -0,0 +1,32 @@
+#ip 2
+seti 123 0 3
+bani 3 456 3
+eqri 3 72 3
+addr 3 2 2
+seti 0 0 2
+seti 0 6 3
+bori 3 65536 4
+seti 2176960 8 3
+bani 4 255 1
+addr 3 1 3
+bani 3 16777215 3
+muli 3 65899 3
+bani 3 16777215 3
+gtir 256 4 1
+addr 1 2 2
+addi 2 1 2
+seti 27 7 2
+seti 0 9 1
+addi 1 1 5
+muli 5 256 5
+gtrr 5 4 5
+addr 5 2 2
+addi 2 1 2
+seti 25 7 2
+addi 1 1 1
+seti 17 2 2
+setr 1 7 4
+seti 7 9 2
+eqrr 3 0 1
+addr 1 2 2
+seti 5 9 2