From 5312755f3251c103602166bcb57a814451a172f4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mika=C3=ABl=20Capelle?= <capelle.mikael@gmail.com>
Date: Thu, 5 Dec 2024 07:25:55 +0100
Subject: [PATCH] 2024 day 5.

---
 src/holt59/aoc/2024/day5.py                |   45 +-
 src/holt59/aoc/inputs/holt59/2024/day5.txt | 1371 ++++++++++++++++++++
 src/holt59/aoc/inputs/tests/2024/day5.txt  |   28 +
 3 files changed, 1441 insertions(+), 3 deletions(-)

diff --git a/src/holt59/aoc/2024/day5.py b/src/holt59/aoc/2024/day5.py
index 4022929..c895ad2 100644
--- a/src/holt59/aoc/2024/day5.py
+++ b/src/holt59/aoc/2024/day5.py
@@ -1,10 +1,49 @@
 import sys
+from collections import defaultdict
 
-lines = sys.stdin.read().splitlines()
+import networkx as nx
 
-answer_1 = ...
 
-answer_2 = ...
+def in_correct_order(update: list[int], requirements: dict[int, set[int]]) -> bool:
+    for i_value, value in enumerate(update):
+        if any(value_2 in requirements[value] for value_2 in update[i_value:]):
+            return False
+    return True
+
+
+def fix_order(update: list[int], requirements: dict[int, set[int]]) -> list[int]:
+    graph = nx.DiGraph()
+    graph.add_nodes_from(update)
+    graph.add_edges_from(
+        (v, k)
+        for k, vs in requirements.items()
+        for v in vs
+        if k in update and v in update
+    )
+
+    return list(nx.topological_sort(graph))
+
+
+part1, part2 = sys.stdin.read().split("\n\n")
+
+requirements: dict[int, set[int]] = defaultdict(set)
+for line in part1.splitlines():
+    v1, v2 = line.split("|")
+    requirements[int(v2)].add(int(v1))
+
+updates = [list(map(int, line.split(","))) for line in part2.splitlines()]
+
+answer_1 = sum(
+    update[len(update) // 2]
+    for update in updates
+    if in_correct_order(update, requirements)
+)
+
+answer_2 = sum(
+    fix_order(update, requirements)[len(update) // 2]
+    for update in updates
+    if not in_correct_order(update, requirements)
+)
 
 print(f"answer 1 is {answer_1}")
 print(f"answer 2 is {answer_2}")
diff --git a/src/holt59/aoc/inputs/holt59/2024/day5.txt b/src/holt59/aoc/inputs/holt59/2024/day5.txt
index e69de29..4b44db3 100644
--- a/src/holt59/aoc/inputs/holt59/2024/day5.txt
+++ b/src/holt59/aoc/inputs/holt59/2024/day5.txt
@@ -0,0 +1,1371 @@
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diff --git a/src/holt59/aoc/inputs/tests/2024/day5.txt b/src/holt59/aoc/inputs/tests/2024/day5.txt
index e69de29..9d146d6 100644
--- a/src/holt59/aoc/inputs/tests/2024/day5.txt
+++ b/src/holt59/aoc/inputs/tests/2024/day5.txt
@@ -0,0 +1,28 @@
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