day 25a

23/day25/example.txt

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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

23/day25/main.py

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+#!/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

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+networkx==3.2.1