day 8 python

aoc2025/aocutils.py

@@ -95,7 +95,7 @@ def bench(part):
 
 
 if __name__ == "__main__":
-    day = 7
+    day = 8
     root = os.path.dirname(__file__)
     task_dir = os.path.join(root, f"day{day}")
     generate_readme(task_dir, day)

aoc2025/day8/README.md

@@ -0,0 +1,64 @@
+--- Day 8: Playground ---
+-------------------------
+
+Equipped with a new understanding of teleporter maintenance, you confidently step onto the repaired teleporter pad.
+
+You rematerialize on an unfamiliar teleporter pad and find yourself in a vast underground space which contains a giant playground!
+
+Across the playground, a group of Elves are working on setting up an ambitious Christmas decoration project. Through careful rigging, they have suspended a large number of small electrical [junction boxes](https://en.wikipedia.org/wiki/Junction_box).
+
+Their plan is to connect the junction boxes with long strings of lights. Most of the junction boxes don't provide electricity; however, when two junction boxes are connected by a string of lights, electricity can pass between those two junction boxes.
+
+The Elves are trying to figure out *which junction boxes to connect* so that electricity can reach *every* junction box. They even have a list of all of the junction boxes' positions in 3D space (your puzzle input).
+
+For example:
+
+```
+162,817,812
+57,618,57
+906,360,560
+592,479,940
+352,342,300
+466,668,158
+542,29,236
+431,825,988
+739,650,466
+52,470,668
+216,146,977
+819,987,18
+117,168,530
+805,96,715
+346,949,466
+970,615,88
+941,993,340
+862,61,35
+984,92,344
+425,690,689
+```
+
+This list describes the position of 20 junction boxes, one per line. Each position is given as `X,Y,Z` coordinates. So, the first junction box in the list is at `X=162`, `Y=817`, `Z=812`.
+
+To save on string lights, the Elves would like to focus on connecting pairs of junction boxes that are *as close together as possible* according to [straight-line distance](https://en.wikipedia.org/wiki/Euclidean_distance). In this example, the two junction boxes which are closest together are `162,817,812` and `425,690,689`.
+
+By connecting these two junction boxes together, because electricity can flow between them, they become part of the same *circuit*. After connecting them, there is a single circuit which contains two junction boxes, and the remaining 18 junction boxes remain in their own individual circuits.
+
+Now, the two junction boxes which are closest together but aren't already directly connected are `162,817,812` and `431,825,988`. After connecting them, since `162,817,812` is already connected to another junction box, there is now a single circuit which contains *three* junction boxes and an additional 17 circuits which contain one junction box each.
+
+The next two junction boxes to connect are `906,360,560` and `805,96,715`. After connecting them, there is a circuit containing 3 junction boxes, a circuit containing 2 junction boxes, and 15 circuits which contain one junction box each.
+
+The next two junction boxes are `431,825,988` and `425,690,689`. Because these two junction boxes were *already in the same circuit*, nothing happens!
+
+This process continues for a while, and the Elves are concerned that they don't have enough extension cables for all these circuits. They would like to know how big the circuits will be.
+
+After making the ten shortest connections, there are 11 circuits: one circuit which contains *5* junction boxes, one circuit which contains *4* junction boxes, two circuits which contain *2* junction boxes each, and seven circuits which each contain a single junction box. Multiplying together the sizes of the three largest circuits (5, 4, and one of the circuits of size 2) produces `40`.
+
+Your list contains many junction boxes; connect together the *1000* pairs of junction boxes which are closest together. Afterward, *what do you get if you multiply together the sizes of the three largest circuits?*
+
+--- Part Two ---
+----------------
+
+The Elves were right; they *definitely* don't have enough extension cables. You'll need to keep connecting junction boxes together until they're all in *one large circuit*.
+
+Continuing the above example, the first connection which causes all of the junction boxes to form a single circuit is between the junction boxes at `216,146,977` and `117,168,530`. The Elves need to know how far those junction boxes are from the wall so they can pick the right extension cable; multiplying the X coordinates of those two junction boxes (`216` and `117`) produces `25272`.
+
+Continue connecting the closest unconnected pairs of junction boxes together until they're all in the same circuit. *What do you get if you multiply together the X coordinates of the last two junction boxes you need to connect?*

aoc2025/day8/day8.py

@@ -0,0 +1,106 @@
+import os
+import math
+
+with open(os.path.join(os.path.dirname(__file__), "example.txt")) as example:
+    example_data = example.read().splitlines()
+
+with open(os.path.join(os.path.dirname(__file__), "input.txt")) as example:
+    input_data = example.read().splitlines()
+
+
+def bench(part):
+    import time
+
+    def wrapper(*args, **kwargs):
+        start = time.perf_counter()
+        value = part(*args, **kwargs)
+        print(f"\tevaluation time: {time.perf_counter() - start} s")
+        return value
+
+    return wrapper
+
+
+def cluster_by_distance(points, max_links=None):
+    """
+    points: list of list shape 3
+    returns cluster as a dict, each cluster – list if index of points
+    """
+
+    n = len(points)
+
+    # collect edges/distances
+    edges = []
+    for i in range(n):
+        x1, y1, z1 = points[i]
+        for j in range(i + 1, n):
+            x2, y2, z2 = points[j]
+            dx = x1 - x2
+            dy = y1 - y2
+            dz = z1 - z2
+            dist = math.sqrt(dx * dx + dy * dy + dz * dz)
+            edges.append((dist, i, j))
+
+    edges.sort(key=lambda e: e[0])
+    max_links = len(edges) if not max_links else max_links
+
+    # Union–Find (DSU)
+    parent = list(range(n))
+    rank = [0] * n
+
+    def find(x):
+        while parent[x] != x:
+            parent[x] = parent[parent[x]]
+            x = parent[x]
+        return x
+
+    def union(a, b):
+        ra, rb = find(a), find(b)
+        if ra == rb:
+            return False
+        if rank[ra] < rank[rb]:
+            parent[ra] = rb
+        elif rank[ra] > rank[rb]:
+            parent[rb] = ra
+        else:
+            parent[rb] = ra
+            rank[ra] += 1
+        return True
+
+    # just walk through the edges
+    links_done = 0
+    for dist, i, j in edges[:max_links]:
+        if union(i, j):
+            last_pair = i, j
+            links_done += 1
+
+    # collect clusters
+    clusters = {}
+    for i in range(n):
+        r = find(i)
+        clusters.setdefault(r, []).append(i)
+
+    return clusters, links_done, last_pair
+
+
+def part1(data, n):
+    from functools import reduce
+    from operator import mul
+
+    points = [list(map(int, point.split(","))) for point in data]
+    clusters, _, _ = cluster_by_distance(points, n)
+    result = reduce(mul, [len(c[1]) for c in sorted(clusters.items(), key=lambda x: len(x[1]), reverse=True)[:3]])
+    print(f"Part1: {result}")
+
+
+@bench
+def part2(data):
+    points = [list(map(int, point.split(","))) for point in data]
+    _, _, last_pair = cluster_by_distance(points)
+    result = points[last_pair[0]][0] * points[last_pair[1]][0]
+    print(f"Part2: {result}")
+
+
+part1(example_data, 10)
+part1(input_data, 1000)
+part2(example_data)
+part2(input_data)

aoc2025/day8/example.txt

@@ -0,0 +1,20 @@
+162,817,812
+57,618,57
+906,360,560
+592,479,940
+352,342,300
+466,668,158
+542,29,236
+431,825,988
+739,650,466
+52,470,668
+216,146,977
+819,987,18
+117,168,530
+805,96,715
+346,949,466
+970,615,88
+941,993,340
+862,61,35
+984,92,344
+425,690,689

aoc2025/day8/input.txt

@@ -0,0 +1,1000 @@
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