25 lines
834 B
Python
25 lines
834 B
Python
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"""
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Turns out int() accepts different bases than 10.
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We can also translate a string using translate() and a table,
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or maketrans(). #TIL
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"""
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with open("input.txt", "r") as f:
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seats = f.read().split('\n')
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def id(code):
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trans = str.maketrans('FBLR', '0101')
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return int(code.translate(trans), 2) # it's literally just binary lmao -- x8 just means x1000 so shift 3 places, and there are 3 digits in the colpart
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ids = [id(seat) for seat in seats]
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print(f"Part 1: {max(ids)}") # i forgot that max() existed whoops
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"""
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Also, instead of iterating over the entire list of IDs,
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we can find the missing seat by simply summing them.
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The missing seat will be excluded from the total.
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"""
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expected_total = sum( range(min(ids), max(ids)+1) ) # some seats are missing
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actual_total = sum(ids)
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print(f"Part 2: {expected_total - actual_total}")
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