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Day 9

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IamTheFij 2023-12-10 17:57:31 -08:00
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12 12 18 49 141 350 747 1415 2476 4207 7371 14029 29364 65506 149083 335340 733288 1548610 3154124 6201669 11794547
6 22 64 152 324 657 1297 2514 4826 9273 17979 35256 69772 138925 277940 559112 1132508 2310987 4744434 9769217 20093966
11 22 42 72 112 161 217 277 337 392 436 462 462 427 347 211 7 -278 -658 -1148 -1764
-7 -12 -21 -42 -81 -141 -224 -319 -331 133 2267 9125 27765 73581 179143 412320 913153 1967454 4149807 8592952 17479171
-9 -6 -1 -3 -17 -36 -21 148 774 2543 6916 16900 38546 83790 175685 357737 710017 1375988 2605465 4820519 8711817
26 36 49 75 137 293 671 1518 3264 6602 12585 22741 39207 64883 103607 160352 241446 354816 510257 719727 997669
14 15 18 32 82 220 533 1148 2234 4001 6696 10596 15998 23206 32515 44192 58454 75443 95198 117624 142458
-2 -2 0 7 29 82 191 417 938 2224 5375 12788 29584 66835 148874 329326 724781 1582691 3413771 7243900 15085694
3 3 9 21 35 41 30 31 223 1205 4559 13907 36743 87415 191740 393857 766059 1422495 2537797 4371865 7302235

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from pathlib import Path
class DiffPyramid:
def __init__(self, starting: list[int]) -> None:
self.seq: list[list[int]] = [starting]
while not all([n == 0 for n in self.seq[-1]]):
self.seq.append(
[
self.seq[-1][i + 1] - self.seq[-1][i]
for i in range(0, len(self.seq[-1]) - 1)
]
)
def prepend(self, n: int) -> None:
for _ in range(n):
lasts = [s[0] for s in self.seq]
nexts: list[int] = []
for last in reversed(lasts):
if not nexts:
nexts.append(last)
else:
nexts.append(last - nexts[-1])
for i, next_num in enumerate(reversed(nexts)):
self.seq[i].insert(0, next_num)
def extend(self, n: int) -> None:
for _ in range(n):
lasts = [s[-1] for s in self.seq]
nexts: list[int] = []
for last in reversed(lasts):
if not nexts:
nexts.append(last)
else:
nexts.append(last + nexts[-1])
for i, next_num in enumerate(reversed(nexts)):
self.seq[i].append(next_num)
def __str__(self) -> str:
return "\n".join(
(" " * i) + " ".join(str(ss) for ss in s) for i, s in enumerate(self.seq)
)
def part1(input: Path) -> int:
total = 0
for line in input.read_text().split("\n"):
if not line:
break
pyramid = DiffPyramid([int(i) for i in line.split()])
pyramid.extend(1)
print(str(pyramid))
print()
total += pyramid.seq[0][-1]
return total
def part2(input: Path) -> int:
total = 0
for line in input.read_text().split("\n"):
if not line:
break
pyramid = DiffPyramid([int(i) for i in line.split()])
pyramid.prepend(1)
print(str(pyramid))
print()
total += pyramid.seq[0][0]
return total
if __name__ == "__main__":
# input = Path("sample.txt")
input = Path("input.txt")
result1 = part1(input)
print("part 1", result1)
result2 = part2(input)
print("part 2", result2)

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d09/sample.txt Normal file
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0 3 6 9 12 15
1 3 6 10 15 21
10 13 16 21 30 45