day 23a
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23/day23/example.txt
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23/day23/example.txt
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#.#####################
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23/day23/input.txt
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23/day23/input.txt
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#.#.#########.###.#.#.#.###########.#########.#.###########.#######.#.###############.#.#######.#.#.#.###.#######.#.#.#####.#.#.#.#####.#.#.#
|
||||
#...#.........#...#.#.#.#.....#.....#...###...#.....#.....#.......#...#...###...#####...#.....#.#...#...#.#.......#...#.....#...#.#.....#.#.#
|
||||
#####.#########.###.#.#.#.###.#.#####.#.###.#######.#.###.#######.#####.#.###.#.#########.###.#.#######.#.#.###########.#########.#.#####.#.#
|
||||
#.....#####.....#...#.#.#...#.#...###.#...#.#.......#...#.#...#...#.....#.#...#.#.........###...#.......#...#.......###.........#...#...#.#.#
|
||||
#.#########.#####.###.#.###.#.###v###.###.#.#.#########.#.#.#.#.###.#####.#.###.#.###############.###########.#####.###########.#####.#.#.#.#
|
||||
#.........#.#...#.#...#...#.#.#.>.>...#...#...#.....#...#...#...###...#...#.#...#.............###.............#...#...#...#...#.......#...#.#
|
||||
#########.#.#.#.#.#.#####.#.#.#.#######.#######.###.#.###############.#.###.#.###############.#################.#.###.#.#.#.#.#############.#
|
||||
#...#.....#...#.#.#.....#.#.#.#.#.......###...#.#...#.........#...#...#...#.#.#.....#.........#...#.............#.....#.#.#.#.#.............#
|
||||
#.#.#.#########.#.#####.#.#.#.#.#.#########.#.#.#.###########.#.#.#.#####.#.#.#.###.#.#########.#.#.###################.#.#.#.#v#############
|
||||
#.#.#.....#.....#...#...#...#...#.....#...#.#.#.#.#...#...#...#.#.#.....#.#.#.#...#.#.#.....###.#.#...........#...###...#.#.#.>.###...###...#
|
||||
#.#.#####.#.#######.#.###############.#.#.#.#.#.#.#.#.#.#.#v###.#.#####.#.#.#.###.#.#v#.###.###.#.###########.#.#.###.###.#.###v###.#.###.#.#
|
||||
#.#.......#.....#...#.......#.........#.#.#.#.#.#.#.#.#.#.>.>.#.#.#.....#.#.#...#.#.>.>.#...#...#...###...#...#.#.#...###.#...#...#.#...#.#.#
|
||||
#.#############.#.#########.#.#########.#.#.#.#.#.#.#.#.#####.#.#.#.#####.#.###.#.#######.###.#####.###.#.#.###.#.#.#####.###.###.#.###.#.#.#
|
||||
#.....#...#...#.#.#...#...#.#.#...#...#.#.#.#.#.#...#.#.#.....#.#.#.#.....#...#.#.....###...#.#.....#...#...###.#.#.....#.#...#...#.#...#.#.#
|
||||
#####.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#####.#.#.#####.#.#.#.#######.#.#####.#####.#.#.#####.#########.#.#####.#.#.###.###.#.###.#.#
|
||||
#.....#.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#...#.#.#.#...###.#.#.#...#.#.#.#.#.....#.#.#.....#.....#.#.#...#.......#...#.#.....#.#.###...#.#...#.#.#
|
||||
#.#####.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#####.#.#.###.###.#.#.#.#.#.#.#.#.#.###.#.#.#.#####.#####.#.#.#.#######v#.###.#.#####.#.#####.#.###.#.#.#
|
||||
#...#...#...#.#.#.#.#.#.#...#...#.#.#.....#.#...#...#.#.#.#.#.#.#.#.#.#.#...#.#.#.#.....#...#.#.#.#...#...>.>.#...#...#...#...###...###.#.#.#
|
||||
###.#.#######.#.#.#.#.#.#########.#.#.#####.###.###.#.#.#.#.#.#.#.#.#.#.#.###.#.#.#.#####.#.#.#.#.###.#.#######.#####.#.#####.#########.#.#.#
|
||||
#...#.......#.#.#.#.#.#...#.......#.#.#...#.###.#...#.#.#.#.#.#.#.#.#.#.#...#.#.#.#...#...#.#.#.#.#...#.......#...#...#...#...#.........#.#.#
|
||||
#.#########.#.#.#.#.#.###.#.#######.#.#.#.#.###.#.###.#.#.#.#.#.#.#.#.#.###.#.#.#.###.#.###.#.#.#.#.#########.###.#.#####.#.###.#########.#.#
|
||||
#...........#...#...#.....#.........#...#...###...###...#...#...#...#...###...#...###...###...#...#...........###...#####...###...........#.#
|
||||
###########################################################################################################################################.#
|
||||
130
23/day23/main.py
Executable file
130
23/day23/main.py
Executable file
|
|
@ -0,0 +1,130 @@
|
|||
#!/usr/bin/env python3
|
||||
|
||||
import random
|
||||
from collections import defaultdict
|
||||
import sys
|
||||
|
||||
sys.setrecursionlimit(15000)
|
||||
|
||||
|
||||
no_slippery = True
|
||||
|
||||
|
||||
PATH = 1
|
||||
FOREST = 2
|
||||
SLOPE_NORTH = 3
|
||||
SLOPE_EAST = 4
|
||||
SLOPE_SOUTH = 5
|
||||
SLOPE_WEST = 6
|
||||
|
||||
|
||||
map = []
|
||||
|
||||
with open("input.txt", "r") as f:
|
||||
for line in f:
|
||||
row = []
|
||||
for char in line.strip():
|
||||
tile = None
|
||||
if char == ".":
|
||||
tile = PATH
|
||||
if char == "#":
|
||||
tile = FOREST
|
||||
if char == "^":
|
||||
tile = SLOPE_NORTH
|
||||
if char == ">":
|
||||
tile = SLOPE_EAST
|
||||
if char == "v":
|
||||
tile = SLOPE_SOUTH
|
||||
if char == "<":
|
||||
tile = SLOPE_WEST
|
||||
row.append(tile)
|
||||
|
||||
map.append(row)
|
||||
|
||||
|
||||
def find_path(row):
|
||||
for i, tile in enumerate(row):
|
||||
if tile == PATH:
|
||||
return i
|
||||
|
||||
|
||||
start = (0, find_path(map[0]))
|
||||
goal = (len(map) - 1, find_path(map[-1]))
|
||||
|
||||
|
||||
def valid_next_step(destination, illegal_slope):
|
||||
global no_slippery
|
||||
(y, x) = destination
|
||||
try:
|
||||
tile = map[y][x]
|
||||
|
||||
if no_slippery:
|
||||
return tile not in [FOREST]
|
||||
else:
|
||||
return tile not in [illegal_slope, FOREST]
|
||||
except:
|
||||
return False
|
||||
|
||||
|
||||
def possible_directions(coords):
|
||||
(y, x) = coords
|
||||
tile = map[y][x]
|
||||
|
||||
if tile == FOREST:
|
||||
raise Exception("Cannot be in a forest!")
|
||||
|
||||
if not no_slippery:
|
||||
if tile == SLOPE_NORTH:
|
||||
return [(y - 1, x)]
|
||||
if tile == SLOPE_EAST:
|
||||
return [(y, x + 1)]
|
||||
if tile == SLOPE_SOUTH:
|
||||
return [(y + 1, x)]
|
||||
if tile == SLOPE_WEST:
|
||||
return [(y, x - 1)]
|
||||
|
||||
steps = [
|
||||
((y - 1, x), SLOPE_SOUTH),
|
||||
((y, x + 1), SLOPE_WEST),
|
||||
((y + 1, x), SLOPE_NORTH),
|
||||
((y, x - 1), SLOPE_EAST),
|
||||
]
|
||||
|
||||
valid_destinations = []
|
||||
|
||||
for destination, illegal_slope in steps:
|
||||
if valid_next_step(destination, illegal_slope):
|
||||
valid_destinations.append(destination)
|
||||
|
||||
return valid_destinations
|
||||
|
||||
|
||||
longest_path = -1
|
||||
|
||||
memo = defaultdict(lambda: -1)
|
||||
|
||||
|
||||
def walk(path, length, position):
|
||||
global longest_path
|
||||
|
||||
if length < memo[position]:
|
||||
return
|
||||
|
||||
if position == goal:
|
||||
if length > longest_path:
|
||||
longest_path = length
|
||||
print("NEW BEST", longest_path)
|
||||
return
|
||||
|
||||
cool = possible_directions(position)
|
||||
random.shuffle(cool)
|
||||
for next_position in cool:
|
||||
if next_position not in path:
|
||||
next_path = dict(path)
|
||||
next_path[position] = True
|
||||
walk(next_path, length + 1, next_position)
|
||||
|
||||
|
||||
walk({}, 0, start)
|
||||
|
||||
print(longest_path)
|
||||
Loading…
Reference in a new issue