redspider

# I went for speed on this one, it was a mess
HEIGHT = len(INPUT.split("\n"))
WIDTH = len(INPUT.split("\n")[0])

grid = dict()

for y, line in enumerate(INPUT.split("\n")):
    for x, c in enumerate(line):
        grid[(x, y)] = c

redspider

adapters = [int(x) for x in INPUT.split("\n")]

# Part 1
last = 0
differences = []
for n in sorted(adapters):
    differences.append(n - last)
    last = n
differences.append(3)

redspider

import operator
from itertools import accumulate, combinations, product

INPUT="""..."""

PREAMBLE = 25

values = [int(n) for n in INPUT.split("\n")]

redspider

def run_program(program):
    acc = 0
    pointer = 0
    seen = set()

    while pointer not in seen:
        op, value = program[pointer]
        seen.add(pointer)
        if op == 'nop':
            pointer += 1

redspider

from functools import reduce

print("Part 1")
print(sum([len(set(list(bunch.replace("\n", "")))) for bunch in INPUT.split("\n\n")]))

print("Part 2")
print(sum(len(reduce(set.intersection, [set(line) for line in bunch.split("\n")])) for bunch in INPUT.split("\n\n")))

redspider

def partition(start, end, top):
    if top:
        return start, start + (end - start) // 2
    return start + (end - start) // 2 + 1, end


def score_seat(boarding_pass):
    start_row = 0
    end_row = 127

redspider

import re

REQUIRED_KEYS = [
    'byr',
    'iyr',
    'eyr',
    'hgt',
    'hcl',
    'ecl',
    'pid'

redspider

WIDTH = len(INPUT.split("\n")[0])

# Part 1
trees = 0
for i, line in enumerate(INPUT.split("\n")):
    if line[i * 3 % WIDTH] == '#':
        trees += 1

print(trees)

redspider

valid = 0

# Part 1
for line in INPUT.split("\n"):
    m = re.match(r"(\d+)-(\d+) (\S): (\S+)", line)
    (low, high, character, password) = m.groups()

    if int(low) <= password.count(character) <= int(high):
        valid += 1

redspider

import itertools
import math

numbers = [int(x) for x in INPUT.split("\n")]

# Part 1
print([math.prod(match) for match in itertools.combinations(numbers, 2) if sum(match) == 2020])

# Part 2
print([math.prod(match) for match in itertools.combinations(numbers, 3) if sum(match) == 2020])