"""Solution for 2020/24"""

from collections import defaultdict

instructions = []
with open('input', 'r') as f:
    for line in f.readlines():
        line = line.strip()
        i = 0
        instruction = []
        while i < len(line):
            if line[i] in ['w', 'e']:
                instruction.append(line[i])
            else:
                instruction.append(line[i:i+2])
                i += 1
            i += 1
        instructions.append(instruction)


print(instructions)

MOVEMENTS = {
    'e': (1, 0),
    'w': (-1, 0),
    'ne': (0, 1),
    'sw': (0, -1),
    'nw': (-1, 1),
    'se': (1, -1),
}


def parse_instruction(instruction):
    coord = (0, 0)
    for move in instruction:
        dx, dy = MOVEMENTS[move]
        coord = (coord[0] + dx, coord[1] + dy)
    return coord


def main():
    flipped_tiles = defaultdict(int)

    for instruction in instructions:
        coord = parse_instruction(instruction)
        flipped_tiles[coord] += 1

        print(''.join(instruction), coord)
    blacks = [x[0] for x in flipped_tiles.items() if x[1] % 2 == 1]
    print('flipped', blacks)
    print(len(blacks))

main()