67 lines
1.4 KiB
Python
67 lines
1.4 KiB
Python
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#!/usr/bin/env python3
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import aoc
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import re
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def parse_line(line: str):
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p = re.compile('(?P<r1>[a-z]+) (?P<op>inc|dec) (?P<param>-?[0-9]+) if (?P<r2>[a-z]+) (?P<cmp>[!=<>]+) (?P<arg>-?[0-9]+)')
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m = p.match(line)
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if m is None: raise "No match"
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return m.group('r1'), m.group('op'), int(m.group('param')), m.group('r2'), m.group('cmp'), int(m.group('arg'))
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def evaluate_cmp(mem: dict, reg: str, op: str, arg: str):
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if not reg in mem:
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mem[reg] = 0
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if op == "==":
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return (mem[reg] == arg)
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if op == "!=":
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return (mem[reg] != arg)
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if op == "<":
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return (mem[reg] < arg)
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if op == ">":
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return (mem[reg] > arg)
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if op == "<=":
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return (mem[reg] <= arg)
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if op == ">=":
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return (mem[reg] >= arg)
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raise "invalid op: " + op
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def exec_cmd(mem: dict, reg: str, op: str, arg: str):
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if not reg in mem:
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mem[reg] = 0
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if op == "inc":
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mem[reg] = mem[reg] + arg
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elif op == "dec":
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mem[reg] = mem[reg] - arg
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else:
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raise "invalid op: " + op
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rawinput = aoc.read_input(8)
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data = list(map(lambda x: parse_line(x), rawinput.splitlines()))
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registers = dict()
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for line in data:
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if evaluate_cmp(registers, line[3], line[4], line[5]):
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exec_cmd(registers, line[0], line[1], line[2])
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max = None
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for v in registers.values():
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if max is None or v > max:
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max = v
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print(max)
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