Python solution for Advent of Code day 23 http://adventofcode.com/day/23

adventofcode23.py

#!/usr/bin/env python
# -*- coding: UTF-8 -*-

import re
from collections import defaultdict
from functools import partial

i = """jio a, +18
inc a
tpl a
inc a
tpl a
tpl a
tpl a
inc a
tpl a
inc a
tpl a
inc a
inc a
tpl a
tpl a
tpl a
inc a
jmp +22
tpl a
inc a
tpl a
inc a
inc a
tpl a
inc a
tpl a
inc a
inc a
tpl a
tpl a
inc a
inc a
tpl a
inc a
inc a
tpl a
inc a
inc a
tpl a
jio a, +8
inc b
jie a, +4
tpl a
inc a
jmp +2
hlf a
jmp -7"""

registers = defaultdict(lambda: 0)
registers['a'] = 1 # comment for first part
instructions = []
execution_pointer = 0

def debug(*s):
#    return -- uncomment for quiet output
    print "%10s %-20s %s" % (execution_pointer, " ".join(str(c) for c in s), "\t".join("%s = %s" % (k,v) for k, v in registers.items()))

def hlf(register):
    global execution_pointer
    debug("hlf", register)
    registers[register] /= 2
    execution_pointer += 1
    
def tpl(register):
    global execution_pointer
    debug("tpl", register)
    registers[register] *= 3
    execution_pointer += 1
    
def inc(register):
    global execution_pointer
    debug("inc", register)
    registers[register] += 1
    execution_pointer += 1
    
def jmp(offset):
    global execution_pointer
    debug("jmp", offset)
    execution_pointer += offset

def jie(register, offset):
    global execution_pointer
    debug("jie", register, offset)
    if registers[register] % 2 == 0:
        execution_pointer += offset
    else:
        execution_pointer += 1

def jio(register, offset):
    global execution_pointer
    debug("jio", register, offset)
    if registers[register] == 1:
        execution_pointer += offset
    else:
        execution_pointer += 1

for l in i.split("\n"):
    parts = re.split("[ ,]+", l)
    
    instruction = parts.pop(0)

    if instruction == "hlf":
        register = parts.pop(0)
        instructions.append(partial(hlf, register))

    elif instruction == "tpl":
        register = parts.pop(0)
        instructions.append(partial(tpl, register))

    elif instruction == "inc":
        register = parts.pop(0)
        instructions.append(partial(inc, register))

    elif instruction == "jmp":
        offset = int(parts.pop(0))
        instructions.append(partial(jmp, offset))

    elif instruction == "jie":
        register = parts.pop(0)
        offset = int(parts.pop(0))
        instructions.append(partial(jie, register, offset))

    elif instruction == "jio":
        register = parts.pop(0)
        offset = int(parts.pop(0))
        instructions.append(partial(jio, register, offset))
    else:
        raise Exception(l)


try:
    while True:
        instructions[execution_pointer]()
except IndexError:
    pass

print "\n".join("%s = %s" % (k,v) for k,v in registers.items())