From 0dd497895a93bec09c911154ffefab85a9559375 Mon Sep 17 00:00:00 2001
From: Nat Lasseter <Nat Lasseter nathan@bytemark.co.uk>
Date: Sat, 23 Dec 2017 12:53:06 +0000
Subject: C attempt. Probably slightly faster. No free optimisations.

---
 day23/part2rb | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100755 day23/part2rb

(limited to 'day23/part2rb')

diff --git a/day23/part2rb b/day23/part2rb
new file mode 100755
index 0000000..b00d666
--- /dev/null
+++ b/day23/part2rb
@@ -0,0 +1,34 @@
+#!/usr/bin/env ruby
+
+def valof(reg_file, reg_or_int)
+  if reg_or_int >= 'a' && reg_or_int <= 'z' then
+    return reg_file[reg_or_int] || 0
+  end
+  return reg_or_int.to_i
+end
+
+input = $stdin.readlines.map(&:chomp)
+
+reg = {'a' => 1}
+pc = 0
+
+loop do
+  break if pc < 0 || pc >= input.length
+  istr = input[pc].split
+  case istr[0]
+  when 'set'
+    reg[istr[1]] = valof(reg, istr[2])
+  when 'sub'
+    reg[istr[1]] = valof(reg, istr[1]) - valof(reg, istr[2])
+  when 'mul'
+    reg[istr[1]] = valof(reg, istr[1]) * valof(reg, istr[2])
+  when 'jnz'
+    if valof(reg, istr[1]) != 0 then
+      pc += valof(reg, istr[2])
+      pc -= 1
+    end
+  end
+  pc += 1
+end
+
+puts reg['h']
-- 
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