path: root/day3.py

#!/usr/bin/env python
import numpy as np

with open("day3.txt") as data:
    counts = np.array([0] * 12)
    for i, line in enumerate(data):
        line = np.array([num for num in map(int, list(line.strip()))])
        counts += line
    gamma = (counts > i/2).astype(int).tolist()
    epsilon = (counts < i/2).astype(int).tolist()

    gamma = int("".join(str(x) for x in gamma), 2)
    epsilon = int("".join(str(x) for x in epsilon), 2)
    print(gamma * epsilon)


# part 2

with open("day3.txt") as data:
    # load data into numpy array
    inputs = np.zeros((1000, 12)).astype(int)
    for i, line in enumerate(data):
        line = np.array([num for num in map(int, list(line.strip()))])
        inputs[i] = line

    oxygen = inputs.copy()
    for i in range(12):
        counts = np.bincount(oxygen[:, i])
        if counts[0] == counts[1]:
            bit = 1
        else:
            bit = np.argmax(counts)
        oxygen = oxygen[oxygen[:, i] == bit]

    oxygen = int("".join(str(x) for x in oxygen[0].tolist()), 2)

    co2 = inputs.copy()
    for i in range(12):
        counts = np.bincount(co2[:, i])
        print(counts)
        if len(counts) < 2 or counts[0] == counts[1]:
            bit = 0
        else:
            bit = np.argmin(counts)
        bit = np.argmin(np.bincount(co2[:, i]))
        co2 = co2[co2[:, i] == bit]
        if len(counts) < 2:
            break

    co2 = int("".join(str(x) for x in co2[0].tolist()), 2)

    print(oxygen * co2)