[py] 2023:04: Comment part2 solution

I felt like this was too Ãconvoluted to let it stand without comments or any debugging output

Author: kiriDevs

2023/day04/part2.py

@@ -1,6 +1,7 @@
 with open("input", "r") as input_file:
     input_lines: [str] = [a.strip() for a in input_file.read().strip().split("\n")]
 
+# Parse the input into something like this: [card_id, (winning_numbers, owned_numbers)]
 card_map: dict[int, (list[int], list[int])] = {}
 for input_line in input_lines:
     id_part, card = input_line.split(": ")
@@ -12,24 +13,30 @@
 
     card_map[card_id] = (winners, owneds)
 
+# For each card type, pre-calculate which other card types it will win
 win_map: dict[int, list[int]] = {}
 for card_id in card_map.keys():
     card: ([int], [int]) = card_map[card_id]
 
+    # Count how many wins we have on this card in total
     winnerc: int = 0
     for winning in card[0]:
         if winning in card[1]:
             winnerc += 1
 
+    # Count through the list to see what exact cards are won
     won_clones: [int] = []
     for i in range(winnerc):
         won_clones.append(card_id + i + 1)
     win_map[card_id] = won_clones
 
+# We start with one of each card
 owned_cards: dict[int, int] = dict([(i, 1) for i in card_map.keys()])
+# Iterate through all card types to calculate how many copies we own
 for card_id in card_map.keys():
     for won_clone_id in win_map[card_id]:
         owned_cards[won_clone_id] += owned_cards[card_id]
 
+# The solution is the total amount of cards
 solution: int = sum(owned_cards.values())
 print(f"SOLVE: {solution}")