def solution(puzzle_input: aoc.Input):
codes = np.array([[int(b) for b in line.strip()]
for line in puzzle_input.lines()])
gamma_arr = codes.sum(axis=0) > (len(codes) // 2)
gamma = to_int(gamma_arr)
epsilon = to_int(~gamma_arr)
return gamma * epsilon
def solution(puzzle_input: aoc.Input):
lines = puzzle_input.lines()
codes = [int(line, base=2) for line in lines]
code_width = len(lines[0].strip())
msb = 1 << (code_width - 1)
oxygen_generator_rating = rating(codes, msb, True)
CO2_scrubber_rating = rating(codes, msb, False)
return oxygen_generator_rating * CO2_scrubber_rating