59 lines
1.6 KiB
Python
59 lines
1.6 KiB
Python
def common_bit(list, bit, invert=False):
|
|
bit_count = [0, 0] # count of 0s and 1s respectively
|
|
for x in list:
|
|
if x[bit] == "0":
|
|
bit_count[0] += 1
|
|
elif x[bit] == "1":
|
|
bit_count[1] += 1
|
|
if bit_count[0] <= bit_count[1]:
|
|
return 0 if invert else 1
|
|
else:
|
|
return 1 if invert else 0
|
|
|
|
|
|
def part1():
|
|
with open("day03.in", "r") as f:
|
|
fa = [line.rstrip() for line in f]
|
|
gamma = ""
|
|
epsilon = ""
|
|
for bit in range(len(fa[0])):
|
|
gamma += str(common_bit(fa, bit))
|
|
epsilon += str(common_bit(fa, bit, invert=True))
|
|
gamma_i = int(gamma, 2)
|
|
epsilon_i = int(epsilon, 2)
|
|
print("Gamma:", gamma_i)
|
|
print("Epsilon:", epsilon_i)
|
|
print("Power consumption:", gamma_i * epsilon_i)
|
|
|
|
|
|
def part2():
|
|
with open("day03.in2", "r") as f:
|
|
fa = [line.rstrip() for line in f]
|
|
fb = fa.copy()
|
|
for bit in range(len(fa[0])):
|
|
fa = [x for x in fa if x[bit] == str(common_bit(fa, bit))]
|
|
# Break to stop if we're already down to one result
|
|
if len(fa) == 1:
|
|
break
|
|
for bit in range(len(fb[0])):
|
|
fb = [x for x in fb if x[bit] == str(common_bit(fb, bit,
|
|
invert=True))]
|
|
if len(fb) == 1:
|
|
break
|
|
oxygen = int(fa[0], 2)
|
|
co2 = int(fb[0], 2)
|
|
print("Oxygen:", oxygen)
|
|
print("CO2:", co2)
|
|
print("Life support rating:", oxygen * co2)
|
|
|
|
|
|
def main():
|
|
print("=== PART 1 ===")
|
|
part1()
|
|
print("=== PART 2 ===")
|
|
part2()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|