adventofcode-2021/day03/day03.py

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()