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/part2 | 39 +++++++++------------------------------
 1 file changed, 9 insertions(+), 30 deletions(-)

(limited to 'day23/part2')

diff --git a/day23/part2 b/day23/part2
index b00d666..634d447 100755
--- a/day23/part2
+++ b/day23/part2
@@ -1,34 +1,13 @@
-#!/usr/bin/env ruby
+#!/bin/bash
 
-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
+if [[ $(basename $(pwd)) != 'day23' ]] ; then
+  cd day23
+fi
 
-input = $stdin.readlines.map(&:chomp)
+file=$(mktemp --tmpdir=. --suffix=.c)
 
-reg = {'a' => 1}
-pc = 0
+trap "rm $file a.out" EXIT
 
-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']
+./part2gen > $file
+gcc -O3 $file
+./a.out
-- 
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