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day6.py
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day6.py
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"""
Day 6: Wait For It
"""
import re
from math import ceil, floor, prod, sqrt
SAMPLE_INPUT = """
Time: 7 15 30
Distance: 9 40 200
"""
NUMBER = re.compile(r"\d+")
def _wincount(time, distance):
b = time / 2
d = sqrt(b * b - distance)
return ceil(b + d - 1) - floor(b - d + 1) + 1
def part1(data):
"""
>>> part1(SAMPLE_INPUT)
288
"""
line1, line2 = filter(None, data.splitlines())
return prod(
_wincount(int(time.group()), int(distance.group()))
for time, distance in zip(NUMBER.finditer(line1), NUMBER.finditer(line2))
)
def part2(data):
"""
>>> part2(SAMPLE_INPUT)
71503
"""
line1, line2 = filter(None, data.splitlines())
return _wincount(
int("".join(NUMBER.findall(line1))), int("".join(NUMBER.findall(line2)))
)
parts = (part1, part2)