From de308443f4ed4e12cd18578af09b93d7d01e2a84 Mon Sep 17 00:00:00 2001
From: bthink <bthink@fake.com>
Date: Fri, 12 Dec 2025 12:42:43 +0100
Subject: final week of 2025

---
 2025/aoc2025-d08.py | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 2025/aoc2025-d08.py

(limited to '2025/aoc2025-d08.py')

diff --git a/2025/aoc2025-d08.py b/2025/aoc2025-d08.py
new file mode 100644
index 0000000..2e053eb
--- /dev/null
+++ b/2025/aoc2025-d08.py
@@ -0,0 +1,69 @@
+#advent of code 2025
+#day 08
+
+def getDistance(j1,j2):
+	jx1,jy1,jz1=j1;
+	jx2,jy2,jz2=j2;
+	euclid=(jx2-jx1)*(jx2-jx1) + (jy2-jy1)*(jy2-jy1) + (jz2-jz1)*(jz2-jz1);
+	#no real need to take square root since if a^2 > b^2 then a > b
+	#no negatives since it's distance
+	return euclid; 
+#parsing
+boxes=[];
+limit=1000; #10 for example
+PuzzleInput=open("08.in","r");
+for line in PuzzleInput:
+	boxes.append(tuple([int(p) for p in line.split(",")]));
+PuzzleInput.close();
+
+numberOfBoxes=len(boxes);
+distances=set();
+for bi1,b1 in enumerate(boxes):
+	for bi2,b2 in enumerate(boxes):
+		if bi2==bi1:continue;
+		d1=getDistance(b1,b2);
+		distances.add((d1,tuple(sorted((b1,b2))) ) );
+distances=sorted(distances,key=lambda m: m[0]);
+
+circuits=dict();
+for di in range(len(distances)):
+	d,boxtuple=distances[di];
+	box1,box2=boxtuple;
+	if box1 not in circuits and box2 not in circuits:
+		circuits[box1]=set([box1,box2]); #first box contains the circuit
+		circuits[box2]=box1; #second box links to first one
+	elif box1 in circuits and box2 not in circuits:
+		b3=box1; #find the box which has the circuit set assigned in dictionary
+		while type(circuits[b3])!=set:
+			b3=circuits[b3];
+		circuits[b3].add(box2);
+		circuits[box2]=b3;
+	elif box2 in circuits and box1 not in circuits:
+		b4=box2;
+		while type(circuits[b4])!=set:
+			b4=circuits[b4];
+		circuits[b4].add(box1);
+		circuits[box1]=b4;
+	elif box2 in circuits and box1 in circuits:
+		b3=box1; 
+		while type(circuits[b3])!=set:
+			b3=circuits[b3];
+		b4=box2;
+		while type(circuits[b4])!=set:
+			b4=circuits[b4];
+		if b3==b4: continue;
+		circuits[b3].update(circuits[b4]);
+		circuits[b4]=b3;
+		
+	clustering=sorted([len(circuits[cluster]) for cluster in circuits if type(circuits[cluster])==set],reverse=True);
+	if clustering[0]==numberOfBoxes:
+		part2=box1[0]*box2[0];
+		break;
+	
+	if di==limit:
+		part1=1;
+		for i in range(3):
+			part1*=clustering[i];
+		
+print("part 1 =",part1, part1==103488);
+print("part 2 =",part2, part2==8759985540);
-- 
cgit v1.2.3