Part 1 for day 16

2024/day16/code.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+
+import sys, math
+import numpy as np
+
+def dijkstra(graph, s, v, a):
+    Q = [n for n in graph.keys()]
+    lq = len(Q)
+    while len(Q) > 0:
+        u = min([u for u in Q], key=lambda x: a[x])
+        Q.remove(u)
+        for vo in graph[u]:
+            if vo in Q:
+                distance_update(graph, u,vo,a,v)
+    return v, a
+
+def distance_update(g, u, vo, a, v):
+    dist = 1 if vo[2] == u[2] else 1000
+    alt = a[u] + dist
+    if alt <= a[vo]:
+        v[vo].add(u)
+        v[vo] = v[vo].union(set(v[u]))
+    if alt < a[vo]:
+        a[vo] = alt
+
+def count_set(edges):
+    edg = set([])
+    for e in edges:
+        edg.add((e[0], e[1]))
+    return len(edg)
+
+if __name__ == '__main__':
+    lab = [list(line.strip('\n')) for line in open(sys.argv[1])]
+    rot90 = {(0,-1): [(-1,0),(1,0)], (1,0): [(0,-1),(0,1)], (0,1): [(1,0),(-1, 0)], (-1,0): [(0,1),(0,-1)]}
+
+    start = (1, len(lab)-2, (1,0))
+    end = (len(lab[0])-2, 1)
+    graph = {}
+    distance = {}
+    pred = {}
+    for y, l in enumerate(lab):
+        for x, f in enumerate(lab[y]):
+            if f == '#': continue
+            for d in [(0,1), (0,-1), (1,0), (-1,0)]:
+                distance[(x,y,d)] = math.inf
+                pred[(x,y,d)] = set([])
+                graph[(x,y,d)] = []
+                for d1 in rot90[d]:
+                    graph[(x,y,d)].append((x,y,d1))
+                if lab[y+d[1]][x+d[0]] == '.' or lab[y+d[1]][x+d[0]] == 'E':
+                    graph[(x,y,d)].append((x+d[0], y+d[1], d))
+    distance[start] = 0
+    v, a = dijkstra(graph, start, pred, distance)
+    print([a[end[0], end[1], d] for d in [(0,1), (0,-1), (1,0), (-1,0)]], [1+count_set(v[end[0], end[1], d]) for d in [(0,1), (0,-1), (1,0), (-1,0)]])
+
+    # challenge 1
+    res1 = min([a[end[0], end[1], d] for d in [(0,1), (0,-1), (1,0), (-1,0)]])
+    print(f"challenge 1:\n{res1}\n")
+
+    # challenge 2
+    ind = [a[end[0], end[1], d] for d in [(0,1), (0,-1), (1,0), (-1,0)]].index(res1)
+    d = [(0,1), (0,-1), (1,0), (-1,0)][ind]
+    res2 = 1+count_set(v[end[0], end[1], d])
+    print(f"challenge 2:\n{res2}")
+

2024/day16/example

@@ -0,0 +1,15 @@
+###############
+#.......#....E#
+#.#.###.#.###.#
+#.....#.#...#.#
+#.###.#####.#.#
+#.#.#.......#.#
+#.#.#####.###.#
+#...........#.#
+###.#.#####.#.#
+#...#.....#.#.#
+#.#.#.###.#.#.#
+#.....#...#.#.#
+#.###.#.#.#.#.#
+#S..#.....#...#
+###############

2024/day16/example2

@@ -0,0 +1,17 @@
+#################
+#...#...#...#..E#
+#.#.#.#.#.#.#.#.#
+#.#.#.#...#...#.#
+#.#.#.#.###.#.#.#
+#...#.#.#.....#.#
+#.#.#.#.#.#####.#
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+#.#.###.#####.###
+#.#.#...#.....#.#
+#.#.#.#####.###.#
+#.#.#.........#.#
+#.#.#.#########.#
+#S#.............#
+#################

2024/day16/input

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