59 lines
1.7 KiB
Python
Executable File
59 lines
1.7 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright 2023 Síle Ekaterin Liszka
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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# IN THE SOFTWARE.
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from itertools import cycle
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from math import lcm
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insns = ''
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data = []
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with open('input.txt', mode='r') as f:
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data = f.readlines()
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insns = data[0][:-1]
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data = data[2:]
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nodes = {}
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for line in data:
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name, dest = line.split(' = ', maxsplit=1)
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left, right = dest[1:-2].split(', ', maxsplit=1)
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nodes[name] = (left, right)
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move = {'L': 0, 'R': 1}
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locs = [x for x in nodes.keys() if x.endswith('A')]
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steps = {}
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for loc in locs:
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orig = loc
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count = 0
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insn = cycle(insns)
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while not loc.endswith('Z'):
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dir = next(insn)
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loc = nodes[loc][move[dir]]
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count += 1
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steps[orig] = count
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steppy = steps.values()
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print(lcm(*steppy))
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