118 lines
2.6 KiB
Python
118 lines
2.6 KiB
Python
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import sys
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sys.path.append('../aoclib')
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from aoclib import Input
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import re
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class Button:
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def __init__(self, cost, x, y):
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self.cost = cost
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self.x = x
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self.y = y
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def __str__(self):
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return f'x: {self.x}, y: {self.y}, cost: {self.cost}'
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class Prize:
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def __init__(self, x, y):
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self.x = x
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self.y = y
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def __str__(self):
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return f'x: {self.x}, y: {self.y}'
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class Machine:
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def __init__(self, a, b: Button, p: Prize):
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self.a = a
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self.b = b
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self.prize = p
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def __str__(self):
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s = ''
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s += 'B_A: ' + self.a.__str__() + '\n'
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s += 'B_B: ' + self.b.__str__() + '\n'
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s += 'Prize: ' + self.prize.__str__() + '\n'
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return s
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def parse_input(lines: list[str]) -> list[Machine]:
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lst = list()
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brx = re.compile(r'X\+(\d+), Y\+(\d+)')
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prx = re.compile(r'X=(\d+), Y=(\d+)')
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b_a = None
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b_b = None
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m = None
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for l in lines:
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if l.startswith('Button A'):
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m = brx.search(l)
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b_a = Button(3, int(m.group(1)), int(m.group(2)))
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if l.startswith('Button B'):
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m = brx.search(l)
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b_b = Button(1, int(m.group(1)), int(m.group(2)))
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if l.startswith('Prize'):
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m = prx.search(l)
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p = Prize(int(m.group(1)), int(m.group(2)))
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machine = Machine(b_a, b_b, p)
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lst.append(machine)
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return lst
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def _solve1(m: Machine) -> int:
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max_a = min(m.prize.x // m.a.x, m.prize.y // m.a.y)+1
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max_b = min(m.prize.x // m.b.x, m.prize.y // m.b.y)+1
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costs = []
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for _a in range(max_a):
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for _b in range(max_b):
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x, y, cost = m.a.x*_a + m.b.x*_b, m.a.y*_a + m.b.y*_b, m.a.cost*_a + m.b.cost*_b
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if x == m.prize.x and y == m.prize.y:
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costs.append(cost)
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if not costs:
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return None
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return min(costs)
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def solve1(lines: list[str]):
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machines = parse_input(lines)
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cost = 0
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for m in machines:
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c = _solve1(m)
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if not c:
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continue
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cost += c
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return cost
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def solve2(lines: list[str]):
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machines = parse_input(lines)
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cost = 0
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for m in machines[:1]:
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continue
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m.prize.x += 10000000000000
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m.prize.y += 10000000000000
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c = _solve1(m)
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if not c:
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continue
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cost += c
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return cost
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if __name__ == '__main__':
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#lines = Input('input_test.txt').lines()
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lines = Input('input.txt').lines()
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#part 1
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print('part 1:', solve1(lines)) # 27157
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#part 2
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print('part 2:', solve2(lines)) # 862486
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