aoc2020day5.py

def to_binary(string: str):
    string = (
        string.replace("B", "1").replace("F", "0").replace("R", "1").replace("L", "0")
    )
    return int(string, base=2)


def part1(strings):
    return max([to_binary(string) for string in strings])


def part2(strings):
    seats = sorted([to_binary(string) for string in strings])
    for i, _ in enumerate(seats):
        if seats[i] - seats[i - 1] == 2:
            return seats[i] - 1


if __name__ == "__main__":
    with open("input.txt") as infile:
        strings = [string.strip() for string in infile.readlines()]

        print(f"Part 1 {part1(strings)}")
        print(f"Part 2 {part2(strings)}")