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cupcakearmy 2021-12-07 12:56:54 +01:00
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# 06
The naive way to do it would be to keep a list. A way more performant ways way to do this is just having an array with 9 entries (0-8) which count the states of the fish. Then you actually just rotate the array each day and add the `0` entry to the `6` additionally.
<details>
<summary>Solutions</summary>
<ol>
<li>352195</li>
<li>1600306001288</li>
</ol>
</details>

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4,1,1,1,5,1,3,1,5,3,4,3,3,1,3,3,1,5,3,2,4,4,3,4,1,4,2,2,1,3,5,1,1,3,2,5,1,1,4,2,5,4,3,2,5,3,3,4,5,4,3,5,4,2,5,5,2,2,2,3,5,5,4,2,1,1,5,1,4,3,2,2,1,2,1,5,3,3,3,5,1,5,4,2,2,2,1,4,2,5,2,3,3,2,3,4,4,1,4,4,3,1,1,1,1,1,4,4,5,4,2,5,1,5,4,4,5,2,3,5,4,1,4,5,2,1,1,2,5,4,5,5,1,1,1,1,1,4,5,3,1,3,4,3,3,1,5,4,2,1,4,4,4,1,1,3,1,3,5,3,1,4,5,3,5,1,1,2,2,4,4,1,4,1,3,1,1,3,1,3,3,5,4,2,1,1,2,1,2,3,3,5,4,1,1,2,1,2,5,3,1,5,4,3,1,5,2,3,4,4,3,1,1,1,2,1,1,2,1,5,4,2,2,1,4,3,1,1,1,1,3,1,5,2,4,1,3,2,3,4,3,4,2,1,2,1,2,4,2,1,5,2,2,5,5,1,1,2,3,1,1,1,3,5,1,3,5,1,3,3,2,4,5,5,3,1,4,1,5,2,4,5,5,5,2,4,2,2,5,2,4,1,3,2,1,1,4,4,1,5

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#!/usr/bin/env python
from os.path import join, dirname
from typing import Dict, List
# Day 06
# Common
def read_input(filename):
data = join(dirname(__file__), '..', filename)
with open(data) as f:
return f.read().strip()
test = read_input('test.txt')
data = read_input('input.txt')
class School:
def __init__(self, fishes: List[int]) -> None:
self.fishes = [0] * 9
for fish in fishes:
self.fishes[fish] += 1
@staticmethod
def parse(raw: str):
return School([int(x) for x in raw.split(',')])
def __len__(self) -> int:
return sum(self.fishes)
def tick(self):
born, *rest = self.fishes.copy()
self.fishes = rest + [born]
self.fishes[6] += born
def simulate(self, days: int):
for _ in range(days):
self.tick()
# 1
print('1.')
school = School.parse(test)
school.simulate(18)
print(len(school))
school.simulate(80)
print(f'Test: {len(school)}')
school = School.parse(data)
school.simulate(80)
print(f'Data: {len(school)}')
# 2
print('\n2.')
school = School.parse(test)
school.simulate(256)
print(f'Test: {len(school)}')
school = School.parse(data)
school.simulate(256)
print(f'Data: {len(school)}')

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3,4,3,1,2