2025(08): part 2 tering done

2025/08/part2.py

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+import numpy as np
+from part1 import load_junctions, distances, get_circuits
+
+debug = False
+
+def get_one_big_circuit_and_tering(junctions):
+	X, Y, dists = distances(junctions)
+	connections = []
+
+	# Start by connecting at least every junction once
+	for i in range(len(junctions)):
+		x, y = X[i], Y[i]
+		connections.append((x, y))
+
+	circuits = get_circuits(junctions, connections)
+	circuits = [list(set(c)) for c in circuits if c != []]
+
+	i = len(junctions)
+	while len(circuits) > 1:
+		x, y = X[i], Y[i]
+		idx_circuit_x = next((i for i, sublist in enumerate(circuits) if x in sublist), None)
+		idx_circuit_y = next((i for i, sublist in enumerate(circuits) if y in sublist), None)
+		if idx_circuit_x != idx_circuit_y:
+			# I truly (tering) hate that it pops before it saves. The order matters.
+			tering_1, tering_2 = min(idx_circuit_x, idx_circuit_y), max(idx_circuit_x, idx_circuit_y)
+			circuits[tering_1] += circuits.pop(tering_2)
+		i += 1
+	
+	# Do the weird math
+	j1, j2 = junctions[[x, y]]
+	return j1[0]*j2[0]
+
+if __name__ == "__main__":
+	test_junctions = load_junctions("testinput")
+	assert get_one_big_circuit_and_tering(test_junctions) == 25272
+
+	junctions = load_junctions("input")
+	print(get_one_big_circuit_and_tering(junctions))