Day 4 completed

+ refactored day 1 to 3 with black -l 119

day4/part2.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3.11
+import re
+from dataclasses import dataclass
+
+input_file = "input.txt"
+
+
+@dataclass
+class Card:
+    winning_numbers: list[int]
+    numbers: list[int]
+    copies: int
+
+    def __hash__(self):
+        return (self.copies, self.winning_numbers, self.numbers).__hash__()
+
+
+with open(input_file) as input:
+    raw_cards = input.readlines()
+
+cards = [Card(winning_numbers=[], numbers=[], copies=1) for i in range(len(raw_cards))]
+
+for line in raw_cards:
+    if match := re.match("Card +(\d+): (.*) \| (.*)", line):
+        card_no = int(match.group(1)) - 1
+        cards[card_no].winning_numbers = list(map(int, re.split(" +", match.group(2).lstrip(" "))))
+        cards[card_no].numbers = map(int, re.split(" +", match.group(3).lstrip(" ")))
+        next_no = card_no + 1
+        for number in cards[card_no].numbers:
+            if number in cards[card_no].winning_numbers:
+                if len(cards) > next_no - 1:
+                    cards[next_no].copies += cards[card_no].copies
+                    next_no += 1
+
+the_sum = sum(map(lambda c: c.copies, cards))
+
+
+print(the_sum)