Solution to Day 8: I Heard You Like Registers - part 1

advent_of_code_d8-p1.py

#aoc_d8.py
import re


inp = ["b inc 5 if a > 1",
"a inc 1 if b < 5",
"c dec -10 if a >= 1",
"c inc -20 if c == 10"]

inp = open("input_d8.txt","r").readlines()

ops = {">":lambda x,v: x>v,"<":lambda x,v: x<v, "inc":lambda x,v: x+v,"<=": lambda x,v: x<=v, "!=": lambda x,v: x!=v, ">=": lambda x,v: x>=v, "==": lambda x,v: x==v, "dec":lambda x,v: x-v}

regs = dict()

for l in inp:
	m = re.match("([a-z]+)\s(inc|dec)\s(-?\d+)\sif\s([a-z]+)\s(<|>|!=|==|>=|<=)\s(-?\d+)",l)
	if not m:
		print l
	#print m
	reg_to_mod = m.group(1)
	op = m.group(2)
	val_to_mod = int(m.group(3))
	reg_to_check = m.group(4)
	op_to_check = m.group(5)
	value_to_check = int(m.group(6))
	#print reg_to_mod, op, val_to_mod, reg_to_check, op_to_check, value_to_check
	if reg_to_mod not in regs:
		regs[reg_to_mod] = 0 
	if reg_to_check not in regs:
		regs[reg_to_check] = 0
	#print "Result:", ops[op_to_check](regs[reg_to_check],value_to_check)
	if ops[op_to_check](regs[reg_to_check],value_to_check):
		regs[reg_to_mod] = ops[op](regs[reg_to_mod],val_to_mod)
	#print regs

#print regs
r = max(regs, key=lambda i: regs[i])
print r,"=",regs[r]