From 6069495db4833627f1dc4cacb2b32554f526d24d Mon Sep 17 00:00:00 2001 From: Maya Herrscher Date: Tue, 17 Dec 2024 08:38:18 +0100 Subject: [PATCH] Part 1 for day 16 --- 2024/day16/challenge | 0 2024/day16/code.py | 65 ++++++++++++++++++++ 2024/day16/example | 15 +++++ 2024/day16/example2 | 17 ++++++ 2024/day16/input | 141 +++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 238 insertions(+) create mode 100644 2024/day16/challenge create mode 100755 2024/day16/code.py create mode 100644 2024/day16/example create mode 100644 2024/day16/example2 create mode 100644 2024/day16/input diff --git a/2024/day16/challenge b/2024/day16/challenge new file mode 100644 index 0000000..e69de29 diff --git a/2024/day16/code.py b/2024/day16/code.py new file mode 100755 index 0000000..d732312 --- /dev/null +++ b/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}") + diff --git a/2024/day16/example b/2024/day16/example new file mode 100644 index 0000000..2c21676 --- /dev/null +++ b/2024/day16/example @@ -0,0 +1,15 @@ +############### +#.......#....E# +#.#.###.#.###.# +#.....#.#...#.# +#.###.#####.#.# +#.#.#.......#.# +#.#.#####.###.# +#...........#.# +###.#.#####.#.# +#...#.....#.#.# +#.#.#.###.#.#.# +#.....#...#.#.# +#.###.#.#.#.#.# +#S..#.....#...# +############### diff --git a/2024/day16/example2 b/2024/day16/example2 new file mode 100644 index 0000000..bc61c57 --- /dev/null +++ b/2024/day16/example2 @@ -0,0 +1,17 @@ +################# +#...#...#...#..E# +#.#.#.#.#.#.#.#.# +#.#.#.#...#...#.# +#.#.#.#.###.#.#.# +#...#.#.#.....#.# +#.#.#.#.#.#####.# +#.#...#.#.#.....# +#.#.#####.#.###.# +#.#.#.......#...# +#.#.###.#####.### +#.#.#...#.....#.# +#.#.#.#####.###.# +#.#.#.........#.# +#.#.#.#########.# +#S#.............# +################# diff --git a/2024/day16/input b/2024/day16/input new file mode 100644 index 0000000..69515b4 --- /dev/null +++ b/2024/day16/input @@ -0,0 +1,141 @@ +############################################################################################################################################# 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