2023.12.01 naive

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akp 2023-12-12 20:15:26 +00:00
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# [Day 12: Hot Springs](https://adventofcode.com/2023/day/12)
Before optimisation: 17.13 seconds for part 1
![Part 1 before optimisation](p1before.svg)
* Reduced allocations of strings by using the same instance of a list in `generate_possible_observations()`

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import sys
from typing import Generator, Iterable
Rule = tuple[str, list[int]]
def parse(instr: str) -> list[Rule]:
res = []
for line in instr.splitlines():
observations, lengths = line.split(" ")
res.append((observations, tuple(map(int, lengths.split(",")))))
return res
def generate_permutations(n: int) -> Generator[list[int], None, None]:
if n == 0:
yield []
return
for p in generate_permutations(n-1):
for c in ".#":
yield p + [c]
def generate_possible_observations(x: str) -> Generator[list[str], None, None]:
xl = list(x)
replacement_locations = [i for i in range(len(xl)) if xl[i] == "?"]
for combs in generate_permutations((nrl := len(replacement_locations))):
for i in range(nrl):
xl[replacement_locations[i]] = combs[i]
yield xl
def check_broken_length_constraints(x: Iterable[str], counts: list[int]) -> bool:
inside_set = False
set_length = 0
current_count = 0
for i in range((lx := len(x))+1):
char = x[i] if i < lx else "-"
if char == "#":
inside_set = True
set_length += 1
elif inside_set:
inside_set = False
try:
if set_length != counts[current_count]:
return False
except IndexError:
# too many counts exist
return False
set_length = 0
current_count += 1
return current_count == len(counts)
def one(instr: str):
rules = parse(instr)
acc = 0
for (template, lengths) in rules:
for obs in generate_possible_observations(template):
if check_broken_length_constraints(obs, lengths):
acc += 1
return acc
def two(instr: str):
return
def _debug(*args, **kwargs):
kwargs["file"] = sys.stderr
print(*args, **kwargs)
if __name__ == "__main__":
if len(sys.argv) < 2 or sys.argv[1] not in ["1", "2"]:
print("Missing day argument", file=sys.stderr)
sys.exit(1)
inp = sys.stdin.read().strip()
if sys.argv[1] == "1":
print(one(inp))
else:
print(two(inp))

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