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78 lines
1.7 KiB
78 lines
1.7 KiB
import sys
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import typing
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def main() -> int:
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highest_seat = 0
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taken_seats = set()
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for line in sys.stdin:
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line = line.strip()
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if line == "":
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continue
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seat = _locate_seat(line)
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if seat.number > highest_seat:
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highest_seat = seat.number
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taken_seats.add(seat.number)
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print(f"bp={line} row={seat.row} column={seat.col} seat={seat.number}")
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seat_number: typing.Optional[int] = None
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n_found = 0
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for candidate_seat in range(0, (127 * 8) + 1):
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if candidate_seat in taken_seats:
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continue
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if (candidate_seat - 1) in taken_seats and (candidate_seat + 1) in taken_seats:
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seat_number = candidate_seat
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n_found += 1
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print(f"highest_seat={highest_seat} seat_number={seat_number} n_found={n_found}")
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return 0
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class Seat:
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row: int
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column: int
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def __init__(self, row: int = 0, col: int = 0):
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self.row = row
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self.col = col
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@property
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def number(self) -> int:
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return (self.row * 8) + self.col
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def _locate_seat(bp: str) -> Seat:
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rows = list(range(0, 128))
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cols = list(range(0, 8))
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row_part = list(bp[:7])
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col_part = list(bp[7:])
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return Seat(
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row=_bisect(rows, [{"F": 0, "B": 1}[s] for s in row_part]),
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col=_bisect(cols, [{"L": 0, "R": 1}[s] for s in col_part]),
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)
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def _bisect(initial_selection: typing.List[int], bisections: typing.List[int]) -> int:
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selection = initial_selection[:]
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for bisection in bisections:
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halfway = int(len(selection) / 2)
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selection = [selection[:halfway], selection[halfway:]][bisection]
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return selection[0]
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if __name__ == "__main__":
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sys.exit(main())
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