[2023/25] solved

2023/25/example

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+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

2023/25/script.py

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+from GhostyUtils import aoc
+from collections import defaultdict, Counter
+import random
+
+
+def bfs(components, start, end):
+    visited = set()
+    frontier = [[start]]
+    while frontier:
+        path = frontier.pop(0)
+        node = path[-1]
+        if node == end:
+            return path
+        for new_node in components[node]:
+            if new_node in visited:
+                continue
+            visited.add(new_node)
+            frontier.append(path + [new_node])
+    return visited
+
+
+def main():
+    components = defaultdict(set)
+    for wires in aoc.read_lines():
+        comp, connections = wires.split(': ')
+        components[comp].update(connections.split())
+        for other_comp in components[comp]:
+            components[other_comp].add(comp)
+
+    seen = defaultdict(int)
+    for _ in range(1000):
+        comps = random.sample(list(components.keys()), 2)
+        path = bfs(components, comps[0], comps[1])
+        for link in zip(path, path[1:]):
+            seen[tuple(sorted(link))] += 1
+    snips = Counter(seen).most_common(3)
+    for snip in snips:
+        l, r = snip[0]
+        components[l].remove(r)
+        components[r].remove(l)
+    one = bfs(components, snips[0][0][0], None)
+    two = bfs(components, snips[0][0][1], None)
+    print('p1:', len(one) * len(two), f'| one: {len(one)} two: {len(two)}')
+
+
+if __name__ == "__main__":
+    main()