108 lines
2.3 KiB
Python
Executable File
108 lines
2.3 KiB
Python
Executable File
#! /usr/bin/env python3
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import functools
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TREE = "#"
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SNOW = "."
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class LoopingList(list):
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def __getitem__(self, key):
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if isinstance(key, int):
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return super().__getitem__(key % len(self))
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if isinstance(key, slice):
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return [
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self[x]
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for x in range(key.start, key.stop, key.step or 1)
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]
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def read_map():
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world_map = []
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with open("input.txt") as f:
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for line in f:
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world_map.append(LoopingList(line.strip()))
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return world_map
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class World(object):
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def __init__(self, world_map, x=0, y=0):
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self._world_map = world_map
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self._x = x
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self._y = y
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# Default slopes
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self._dx = 1
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self._dy = 1
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def move(self, dx, dy, should_print=False, print_buffer=0):
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self._x += dx
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self._y += dy
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if should_print:
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print("".join(self._world_map[self._y][0:self._x+print_buffer]))
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return self._world_map[self._y][self._x]
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def print_row(self):
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print("".join(self._world_map[self._y]))
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def peek(self, dx, dy):
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return self._world_map[dy + self._y][dx + self._x]
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def at_end(self):
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return self._y >= len(self._world_map) - 1
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def set_slope(self, dx, dy):
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self._dx = dx
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self._dy = dy
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def ski(self, count_trees=True):
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trees = 0
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while not self.at_end():
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try:
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space = self.move(self._dx, self._dy)
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if count_trees and space == TREE:
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trees += 1
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except IndexError:
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print("At end of the world")
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return trees
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def take_lift(self):
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self._x = 0
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self._y = 0
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def part1():
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world_map = read_map()
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world = World(world_map)
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world.set_slope(3, 1)
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trees = world.ski()
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print("Total trees", trees)
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def part2():
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slopes = {
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(1, 1): None,
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(3, 1): None,
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(5, 1): None,
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(7, 1): None,
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(1, 2): None,
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}
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world_map = read_map()
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world = World(world_map)
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for slope in slopes:
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world.take_lift()
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world.set_slope(*slope)
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slopes[slope] = world.ski()
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print(slopes)
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print("Answer:", functools.reduce(lambda x, y: x*y, slopes.values()))
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if __name__ == "__main__":
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part1()
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part2()
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