Solve day 12.

main
felixm 2023-12-15 19:14:22 -05:00
parent 437498a745
commit d41e4737cb
2 changed files with 49 additions and 23 deletions

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@ -10,5 +10,5 @@
- Day 8: 25:00; I was doing pretty decent here.
- Day 9: 57:00; my input parse function did not consider negative values...
- Day 10: 180:00; this one was hard for me.
- Day 11: 68:00; okay but not elegant and way too slow ofc.
- Day 12:
- Day 11: 68:00; okay but not elegant and way too slow ofc; x-ray solution would have been neat
- Day 12: 52:00 and 22:00 for leaderboard; had the right idea and I am good at this type of problem

68
d12.py
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@ -1,43 +1,69 @@
import lib
from functools import lru_cache
EXAMPLE = """
???.### 1,1,3
.??..??...?##. 1,1,3
?#?#?#?#?#?#?#? 1,3,1,6
????.#...#... 4,1,1
????.######..#####. 1,6,5
?###???????? 3,2,1
"""
def solve(lines: list[str]):
@lru_cache
def count(elems, groups):
if not elems and not groups:
return 1
elif elems and not groups:
if all(e in ['.', '?'] for e in elems):
return 1
return 0
elif not elems and groups:
return 0
r = 0
if elems[0] in ['?', '.']:
r += count(elems[1:], groups)
g = groups[0]
if len(elems) < g:
return 0
es, rest = elems[:g], elems[g:]
if all(e in ['?', '#'] for e in es) and (len(rest) == 0 or rest[0] in ['.', '?']):
r += count(rest[1:], groups[1:])
return r
def solve(lines: list[str], repeat=1):
all = []
for (_, line) in enumerate(lines):
springs, numbers = line.split()
numbers = tuple(lib.str_to_int_list(numbers))
ns = "?".join([springs for _ in range(repeat)])
all.append((tuple(ns), numbers * repeat))
res = 0
# g = list(map(list, lines))
# for (ri, r) in enumerate(g):
# for (ci, c) in enumerate(r):
# pass
for (i, line) in enumerate(lines):
print(i, line)
# digits = lib.str_to_int_list(line)
# digit = lib.str_to_single_int(line)
for a in all:
# print(a, count(*a))
res += count(*a)
# 28:00
# 50:00 total
return res
def solve2(lines: list[str]):
res = 0
for (i, line) in enumerate(lines):
print(i, line)
return res
def main():
lines = lib.str_to_lines_no_empty(EXAMPLE)
print("Example 1:", solve(lines))
return
lines = lib.str_to_lines_no_empty(open("i12.txt").read())
print("Solution 1:", solve(lines))
return
lines = lib.str_to_lines_no_empty(EXAMPLE)
print("Example 2:", solve2(lines))
return
print("Example 2:", solve(lines, 5))
lines = lib.str_to_lines_no_empty(open("i12.txt").read())
print("Solution 2:", solve2(lines))
print("Solution 2:", solve(lines, 5))
if __name__ == "__main__":
main()