Add 2025 day 8 solutionsHEADmaster

3 files changed, 55 insertions, 0 deletions

diff --git a/2025/08/.gitignore b/2025/08/.gitignore
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+puzzle-[12].py
diff --git a/2025/08/Makefile b/2025/08/Makefile
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+++ b/2025/08/Makefile
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+include ../../Makefiles/py.mk
diff --git a/2025/08/puzzles.py b/2025/08/puzzles.py
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+++ b/2025/08/puzzles.py
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+#!/usr/bin/python3
+
+import functools
+import heapq
+import itertools
+import math
+import operator
+
+
+type Point = tuple[int, int, int]
+type Circuit = set[Point]
+
+
+def main() -> None:
+	with open('input', 'r') as f:
+		boxes = [tuple(map(int, l.split(','))) for l in f.readlines()]
+
+	circuits: list[Circuit] = []
+	pairs = itertools.combinations(boxes, 2)
+	pairs = iter(sorted(pairs, key=lambda p: math.dist(*p)))
+
+# START PART 1
+	for p, q in itertools.islice(pairs, 1000):
+		connect(circuits, p, q)
+
+	lens = heapq.nlargest(3, map(len, circuits))
+	print(functools.reduce(operator.mul, lens))
+# END PART 1 START PART 2
+	while len(circuits) != 1 or len(circuits[0]) != len(boxes):
+		p, q = next(pairs)
+		connect(circuits, p, q)
+	print(p[0] * q[0])
+# END PART 2
+
+
+def connect(circuits: list[Circuit], p: Point, q: Point) -> None:
+	pc = next((c for c in circuits if p in c), None)
+	qc = next((c for c in circuits if q in c), None)
+
+	match (pc, qc):
+		case (None, None):
+			circuits.append({p, q})
+		case (x, None):
+			pc.add(q)
+		case (None, y):
+			qc.add(p)
+		case (x, y) if x is not y:
+			circuits.remove(qc)
+			pc |= qc
+
+
+if __name__ == '__main__':
+	main()