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32 lines
824 B
Python
32 lines
824 B
Python
6 years ago
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#!/usr/bin/env python3
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from functools import reduce
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from pprint import pprint
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with open('input.txt', 'r') as f:
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instructions = [x.strip() for x in f.readlines()]
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instructions = [(x.split(' ')[1], x.split(' ')[7]) for x in instructions]
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steps = {y for x in instructions for y in x} # flatten
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finished = list()
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requirements = { step: [] for step in steps }
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for el in instructions:
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requirements[el[1]].append(el[0])
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print(requirements)
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print(steps)
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while len(steps) != 0:
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possible = [ step for step in requirements if len(requirements[step]) == 0]
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possible.sort()
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step = possible[0]
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steps.remove(step)
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requirements.pop(step)
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for el in requirements:
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if step in requirements[el]:
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requirements[el].remove(step)
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finished.append(step)
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print(''.join(finished))
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