day 25a

23/day23/example.txt

@@ -0,0 +1,23 @@
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23/day23/input.txt

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+#.#####.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#####.#.#.###.###.#.#.#.#.#.#.#.#.#.###.#.#.#.#####.#####.#.#.#.#######v#.###.#.#####.#.#####.#.###.#.#.#
+#...#...#...#.#.#.#.#.#.#...#...#.#.#.....#.#...#...#.#.#.#.#.#.#.#.#.#.#...#.#.#.#.....#...#.#.#.#...#...>.>.#...#...#...#...###...###.#.#.#
+###.#.#######.#.#.#.#.#.#########.#.#.#####.###.###.#.#.#.#.#.#.#.#.#.#.#.###.#.#.#.#####.#.#.#.#.###.#.#######.#####.#.#####.#########.#.#.#
+#...#.......#.#.#.#.#.#...#.......#.#.#...#.###.#...#.#.#.#.#.#.#.#.#.#.#...#.#.#.#...#...#.#.#.#.#...#.......#...#...#...#...#.........#.#.#
+#.#########.#.#.#.#.#.###.#.#######.#.#.#.#.###.#.###.#.#.#.#.#.#.#.#.#.###.#.#.#.###.#.###.#.#.#.#.#########.###.#.#####.#.###.#########.#.#
+#...........#...#...#.....#.........#...#...###...###...#...#...#...#...###...#...###...###...#...#...........###...#####...###...........#.#
+###########################################################################################################################################.#

23/day23/main.py

@@ -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)

23/day25/example.txt

@@ -0,0 +1,13 @@
+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

@@ -0,0 +1,21 @@
+#!/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

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