path: root/day8.py

import numpy as np
import re

def parse_line(line: str):
    '''
    rect/rotate = 0/1
    row/col = 0/1
    dims = int/int
    '''
    splitline = line.strip().split()
    if splitline[0] == 'rect':
        col, row = map(int, splitline[-1].split('x'))
        return (0, -1, col, row)
    else:
        dim, offset = map(int, re.findall(r'\d+', line))
        if splitline[1] == 'row':
            return (1, 0, dim, offset)
        else:
            return (1, 1, dim, offset)

with open('day8.txt') as data:
    insts = [parse_line(line) for line in data]

def part1(instructions):
    grid = np.zeros((6, 50), dtype=bool)
    for inst in instructions:
        match inst:
            case 0, _, col, row:
                grid[0:row, 0:col] = True
            case 1, axis, dim, offset:
                if axis == 0:
                    grid[dim] = np.roll(grid[dim], offset)
                else:
                    grid[:, dim] = np.roll(grid[:, dim], offset)
    return grid

def part2(instructions):
    grid = part1(instructions)
    printable = np.zeros_like(grid, dtype=str)
    printable[grid] = "*"
    printable[~grid] = " "
    for line in printable:
        print("".join(char for char in line))

print(np.count_nonzero(part1(insts)))
part2(insts)