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23/day23/input.txt

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-#.#####.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#####.#.#.###.###.#.#.#.#.#.#.#.#.#.###.#.#.#.#####.#####.#.#.#.#######v#.###.#.#####.#.#####.#.###.#.#.#
-#...#...#...#.#.#.#.#.#.#...#...#.#.#.....#.#...#...#.#.#.#.#.#.#.#.#.#.#...#.#.#.#.....#...#.#.#.#...#...>.>.#...#...#...#...###...###.#.#.#
-###.#.#######.#.#.#.#.#.#########.#.#.#####.###.###.#.#.#.#.#.#.#.#.#.#.#.###.#.#.#.#####.#.#.#.#.###.#.#######.#####.#.#####.#########.#.#.#
-#...#.......#.#.#.#.#.#...#.......#.#.#...#.###.#...#.#.#.#.#.#.#.#.#.#.#...#.#.#.#...#...#.#.#.#.#...#.......#...#...#...#...#.........#.#.#
-#.#########.#.#.#.#.#.###.#.#######.#.#.#.#.###.#.###.#.#.#.#.#.#.#.#.#.###.#.#.#.###.#.###.#.#.#.#.#########.###.#.#####.#.###.#########.#.#
-#...........#...#...#.....#.........#...#...###...###...#...#...#...#...###...#...###...###...#...#...........###...#####...###...........#.#
-###########################################################################################################################################.#

23/day23/main.py

@@ -1,130 +0,0 @@
-#!/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)

23/day25/example.txt

@@ -1,13 +0,0 @@
-jqt: rhn xhk nvd
-rsh: frs pzl lsr
-xhk: hfx
-cmg: qnr nvd lhk bvb
-rhn: xhk bvb hfx
-bvb: xhk hfx
-pzl: lsr hfx nvd
-qnr: nvd
-ntq: jqt hfx bvb xhk
-nvd: lhk
-lsr: lhk
-rzs: qnr cmg lsr rsh
-frs: qnr lhk lsr

23/day25/main.py

@@ -1,21 +0,0 @@
-#!/usr/bin/env python3
-
-import networkx as nx
-
-G = nx.Graph()
-
-with open("input.txt", "r") as f:
-    for line in f:
-        pieces = line.strip().split(": ")
-        start = pieces[0]
-        for end in pieces[1].split(" "):
-            G.add_edge(start, end)
-
-cut_edges = nx.minimum_edge_cut(G)
-G.remove_edges_from(cut_edges)
-
-part1 = 1
-for subgraph in (G.subgraph(c) for c in nx.connected_components(G)):
-    part1 *= subgraph.number_of_nodes()
-
-print(part1)

23/day25/requirements.txt

@@ -1 +0,0 @@
-networkx==3.2.1