Day 23

day23.py

@@ -0,0 +1,100 @@
+from __future__ import annotations
+from collections import defaultdict
+from tools.aoc import AOCDay
+from tools.coordinate import Coordinate
+from tools.grid import Grid
+from typing import Any
+
+
+ICE = {
+    '>': Coordinate(1, 0),
+    'v': Coordinate(0, 1)
+}
+
+
+class GraphNode(Coordinate):
+    def __init__(self, x: int, y: int, z: int = None):
+        self.children = {}
+
+
+def build_graph(grid: Grid, part2: bool = False) -> GraphNode:
+    root = GraphNode(1, 0)
+    crossings = {}
+    end = Coordinate(grid.maxX, grid.maxY)
+
+    def traverse_grid(node: GraphNode, next_coord: Coordinate):
+        count = 1
+        n = set(grid.getNeighboursOf(next_coord, includeDefault=False, includeDiagonal=False))
+        last_coord = node
+        while len(n - {last_coord}) == 1:
+            count += 1
+            last_coord, next_coord = next_coord, (n - {last_coord}).pop()
+            n = set(grid.getNeighboursOf(next_coord, includeDefault=False, includeDiagonal=False))
+
+        if len(n) == 1:  # dead end
+            if next_coord == end:
+                node.children[GraphNode(*next_coord)] = count
+        else:  # crossing
+            if next_coord in crossings:
+                if part2:
+                    crossings[next_coord].children[node] = count
+                node.children[crossings[next_coord]] = count
+            else:
+                this_node = GraphNode(*next_coord)
+                crossings[next_coord] = this_node
+                node.children[this_node] = count
+                for c in n:
+                    if part2 or grid.get(c) not in ICE or ICE[grid.get(c)] == c - next_coord:
+                        traverse_grid(this_node, c)
+
+    traverse_grid(root, Coordinate(1, 1))
+    return root
+
+
+def get_longest_path(root: GraphNode, looking_for: GraphNode) -> int:
+    D = defaultdict(int)
+    v = set()
+
+    def calc_dist(node: GraphNode, dist: int):
+        if node in v:
+            return
+        v.add(node)
+        if D[node] < dist:
+            D[node] = dist
+
+        for c_node, c_dist in node.children.items():
+            calc_dist(c_node, dist + c_dist)
+
+        v.remove(node)
+
+    calc_dist(root, 0)
+    return D[looking_for]
+
+
+class Day(AOCDay):
+    inputs = [
+        [
+            (94, "input23_test"),
+            (2326, "input23"),
+        ],
+        [
+            (154, "input23_test"),
+            (6574, "input23"),
+        ]
+    ]
+
+    def parse_input(self, part2: bool = False) -> (GraphNode, Coordinate):
+        grid = Grid.from_data(self.getInput(), translate={'#': False})
+        root = build_graph(grid, part2=part2)
+        return root, Coordinate(grid.maxX, grid.maxY)
+
+    def part1(self) -> Any:
+        return get_longest_path(*self.parse_input())
+
+    def part2(self) -> Any:
+        return get_longest_path(*self.parse_input(part2=True))
+
+
+if __name__ == '__main__':
+    day = Day(2023, 23)
+    day.run(verbose=True)

inputs/input23

@@ -0,0 +1,141 @@
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