def convert_seat_to_seat_id(seat):
'''The seat as a seat id, e.g. row 44 column 5 is seat id 357 (row + (column * 8))'''
return seat['row'] * 8 + seat['column']
def convert_binary_to_decimal(binary, one_char):
'''Converts a binary number to decimal, with a specified character for 1, so FBF with B as 1 gives 3'''
decimal = 0
# https://www.w3schools.com/python/python_howto_reverse_string.asp
for index, bit in enumerate(binary[::-1]):
if (bit == one_char):
decimal += (2**index + 1) - 1
return decimal
def highest_seat_id_from_boarding_passes(boarding_passes):
'''The highest seat id from a list of boarding passes'''
boarding_pass_with_highest_seat_id = max(
boarding_passes,
key=lambda boarding_pass: convert_seat_to_seat_id(
convert_boarding_pass_to_seat(boarding_pass)))
return convert_seat_to_seat_id(
convert_boarding_pass_to_seat(boarding_pass_with_highest_seat_id))
if __name__ == '__main__':
lines = read_input_file.read(
'/Users/jondarrer/Code/advent-of-code-2020/src/input/day5.txt')
print(highest_seat_id_from_boarding_passes(lines))
import read_input_file
def is_password_valid(min, max, char, password):
count = password.count(char)
if (min > count or max < count):
return False
return True
def number_of_valid_passwords(list_of_password_and_policy):
valids = 0
for password_and_policy in list_of_password_and_policy:
if (is_password_valid(int(password_and_policy['min']),
int(password_and_policy['max']),
password_and_policy['char'],
password_and_policy['password']) == True):
valids = valids + 1
return valids
if __name__ == '__main__':
list_of_password_and_policy = read_input_file.read(
'/Users/jondarrer/Code/advent-of-code-2020/src/input/day2.txt')
print(number_of_valid_passwords(list_of_password_and_policy))