aoc-2020/d19/main.py

382 lines
9.6 KiB
Python
Executable File

#! /usr/bin/env python3
from itertools import product
from typing import Dict
from typing import List
from typing import Optional
from typing import Tuple
MAX_DEPTH = 10
class Rule(object):
_rule_body: str
key: int
_values: List[str]
_depth: int
def __init__(self, key: int, rule_body: str):
self.key = key
self._rule_body = rule_body
self._values = []
self._depth = 0
def validate(self, s: str) -> bool:
return s in self.values()
def values(self) -> List[str]:
if not self._values:
if self._depth >= MAX_DEPTH:
# Break out of recursion
return []
self._depth += 1
values: List[str] = []
for sub_rule in self._rule_body.split(" | "):
rule_combo: "Rule" = ValueRule(-1, [""])
for rule_key in sub_rule.split(" "):
rule_combo += RULE_INDEX[int(rule_key)]
values += rule_combo.values()
self._values = values
return self._values
def __add__(self, other) -> "Rule":
values = [
"".join(v)
for v in product(self.values(), other.values())
]
return ValueRule(
-1,
values,
)
def __mul__(self, other) -> List[str]:
raise NotImplementedError()
def __repr__(self) -> str:
return f"<Rule key={self.key} rule={self._rule_body}>"
class ValueRule(Rule):
key: int
def __init__(self, key: int, values: List[str]):
self.key = key
self._values = values
def values(self) -> List[str]:
return self._values
def __repr__(self) -> str:
return f"<ValueRule key={self.key} values={self.values()}>"
def parse_rule(line) -> Tuple[int, Rule]:
rule_index = line.find(":")
if rule_index <= 0:
raise ValueError(f"Could not find rule number in {line}")
rule_key = int(line[:rule_index])
rule_body = line[rule_index+2:]
rule: Optional[Rule] = None
if rule_body[0] == '"':
rule = ValueRule(rule_key, [rule_body[1:-1]])
else:
rule = Rule(rule_key, rule_body)
return rule_key, rule
RULE_INDEX: Dict[int, Rule] = {}
def test():
test_input = (
"0: 4 1 5",
"1: 2 3 | 3 2",
"2: 4 4 | 5 5",
"3: 4 5 | 5 4",
'4: "a"',
'5: "b"',
)
RULE_INDEX.update({
parse_rule(line)
for line in test_input
})
print(RULE_INDEX)
for rule in RULE_INDEX.values():
print(rule.key, rule.values())
test_eval = (
"ababbb",
"bababa",
"abbbab",
"aaabbb",
"aaaabbb",
)
rule_0 = RULE_INDEX[0]
matched = 0
for t in test_eval:
if rule_0.validate(t):
matched += 1
print(f"Total matched is {matched}")
def part1():
rules_parsed = False
matched = 0
with open("input.txt") as f:
for line in f:
line = line.strip()
print(line, end="")
if line == "":
rules_parsed = True
print("DONE PARSING RULES")
elif not rules_parsed:
key, rule = parse_rule(line)
RULE_INDEX[key] = rule
print(" Parsed")
elif RULE_INDEX[0].validate(line):
matched += 1
print(" OK")
else:
print(" Not OK")
print(f"Total matched is {matched}")
def chunk(a, n):
return (a[i:i+n] for i in range(0, len(a), n))
def count_prefix(value: str, prefix: str) -> int:
count = 0
for c in chunk(value, len(prefix)):
if c == prefix:
count += 1
else:
break
return count
class Rule0(Rule):
def __init__(self):
super().__init__(0, "")
def validate(self, value: str) -> bool:
r42 = RULE_INDEX[42]
r31 = RULE_INDEX[31]
# print(42, "\n".join(r42.values()))
# print(31, "\n".join(r31.values()))
size = None
for v in r42.values():
if size is None:
size = len(v)
assert len(v) == size
for v in r31.values():
assert len(v) == size
match42, match31 = 0, 0
for c in chunk(value, size):
if match31 == 0 and r42.validate(c):
match42 += 1
elif match42 != 0 and r31.validate(c):
match31 += 1
else:
return False
# if value == "abbbbbabbbaaaababbaabbbbabababbbabbbbbbabaaaa":
# from pdb import set_trace; set_trace()
if match42 > match31 and match31 > 0:
return True
return False
# if RULE_INDEX[0].validate(value):
# from pdb import set_trace; set_trace()
# Check beginning starts with "8"
for prefix1 in r42.values():
prefix_count = count_prefix(value, prefix1)
if prefix_count == 0:
# Not even one chunk was matched, this is a bust
continue
# Trim first prefix out
back_half = value[len(prefix1) * prefix_count:]
# Check following "11" match
for prefix2, suffix in product(r42.values(), r31.values()):
remain = back_half
if RULE_INDEX[0].validate(value) and prefix1 == "bbabb" and prefix2 == "bbaab" and suffix == "aabba":
from pdb import set_trace; set_trace()
# If prefixes aren't the same, look for the new one
if prefix1 != prefix2:
prefix_count = count_prefix(remain, prefix2)
# Trim the new prefix
remain = remain[len(prefix2) * prefix_count:]
if prefix_count == 0:
# No valid prefix
continue
suffix_count = count_prefix(remain, suffix)
if suffix_count == 0:
# No valid suffix
continue
# Trim the suffix
remain = remain[len(suffix) * suffix_count:]
if len(remain) > 0:
# There is something after the suffix
continue
# Make sure we've seen at least the same number of prefixes
if prefix_count >= suffix_count:
return True
return False
def part2():
# Update two changed rules
# 0: 8 11
# Test short circuits
# RULE_INDEX[42] = parse_rule('42: "a"')[1]
# RULE_INDEX[31] = parse_rule('31: "b"')[1]
# rule8 = parse_rule("8: 42 | 42 8")[1]
# rule11 = parse_rule("11: 42 31 | 42 11 31")[1]
# print(RULE_INDEX[8].values())
# print(RULE_INDEX[11].values())
rules_parsed = False
matched = 0
# Empty rules
RULE_INDEX.clear()
with open("input.txt") as f:
for line in f:
line = line.strip()
print(line, end="")
if line == "":
rules_parsed = True
# All rules parsed, replace values
# RULE_INDEX[8] = rule8
# RULE_INDEX[11] = rule11
print("DONE PARSING RULES")
r42 = RULE_INDEX[42]
print("prefixes", r42.values())
r31 = RULE_INDEX[31]
print("suffixes", r31.values())
elif not rules_parsed:
key, rule = parse_rule(line)
RULE_INDEX[key] = rule
print(" Parsed")
elif Rule0().validate(line):
matched += 1
print(" OK")
else:
print(" Not OK")
print(f"Total matched is {matched}")
def test2():
r0 = Rule0()
# RULE_INDEX[42] = ValueRule(42, ["prefixa", "prefixb"])
# RULE_INDEX[31] = ValueRule(31, ["sa", "sb"])
test_input = (
"42: 9 14 | 10 1",
"9: 14 27 | 1 26",
"10: 23 14 | 28 1",
'1: "a"',
"11: 42 31",
"5: 1 14 | 15 1",
"19: 14 1 | 14 14",
"12: 24 14 | 19 1",
"16: 15 1 | 14 14",
"31: 14 17 | 1 13",
"6: 14 14 | 1 14",
"2: 1 24 | 14 4",
"0: 8 11",
"13: 14 3 | 1 12",
"15: 1 | 14",
"17: 14 2 | 1 7",
"23: 25 1 | 22 14",
"28: 16 1",
"4: 1 1",
"20: 14 14 | 1 15",
"3: 5 14 | 16 1",
"27: 1 6 | 14 18",
'14: "b"',
"21: 14 1 | 1 14",
"25: 1 1 | 1 14",
"22: 14 14",
"8: 42",
"26: 14 22 | 1 20",
"18: 15 15",
"7: 14 5 | 1 21",
"24: 14 1",
)
RULE_INDEX.update({
parse_rule(line)
for line in test_input
})
og_valid = 0
new_valid = 0
for v in (
"abbbbbabbbaaaababbaabbbbabababbbabbbbbbabaaaa",
"bbabbbbaabaabba",
"babbbbaabbbbbabbbbbbaabaaabaaa",
"aaabbbbbbaaaabaababaabababbabaaabbababababaaa",
"bbbbbbbaaaabbbbaaabbabaaa",
"bbbababbbbaaaaaaaabbababaaababaabab",
"ababaaaaaabaaab",
"ababaaaaabbbaba",
"baabbaaaabbaaaababbaababb",
"abbbbabbbbaaaababbbbbbaaaababb",
"aaaaabbaabaaaaababaa",
"aaaabbaaaabbaaa",
"aaaabbaabbaaaaaaabbbabbbaaabbaabaaa",
"babaaabbbaaabaababbaabababaaab",
"aabbbbbaabbbaaaaaabbbbbababaaaaabbaaabba",
):
og = RULE_INDEX[0].validate(v)
n = r0.validate(v)
print(v, "og", og, "new", n)
if og:
og_valid += 1
if n:
new_valid += 1
print("og valid:", og_valid, "new valid:", new_valid)
if __name__ == "__main__":
# part1()
part2()
# test2()