2023 day 7.

2023/day7.py

@@ -1,13 +1,49 @@
 import sys
-from collections import defaultdict
-from dataclasses import dataclass
+from collections import Counter, defaultdict
+
+
+class HandTypes:
+    HIGH_CARD = 0
+    ONE_PAIR = 1
+    TWO_PAIR = 2
+    THREE_OF_A_KIND = 3
+    FULL_HOUSE = 4
+    FOUR_OF_A_KIND = 5
+    FIVE_OF_A_KIND = 6
+
+
+# mapping from number of different cards + highest count of card to the hand type
+LEN_LAST_TO_TYPE: dict[int, dict[int, int]] = {
+    1: defaultdict(lambda: HandTypes.FIVE_OF_A_KIND),
+    2: defaultdict(lambda: HandTypes.FULL_HOUSE, {4: HandTypes.FOUR_OF_A_KIND}),
+    3: defaultdict(lambda: HandTypes.TWO_PAIR, {3: HandTypes.THREE_OF_A_KIND}),
+    4: defaultdict(lambda: HandTypes.ONE_PAIR),
+    5: defaultdict(lambda: HandTypes.HIGH_CARD),
+}
+
+
+def extract_key(hand: str, values: dict[str, int], joker: str = "0") -> tuple[int, ...]:
+    # get count of each cards, in increasing count - the 'or' part handles the JJJJJ
+    # case when joker is True
+    cnt = sorted(Counter(hand.replace(joker, "")).values()) or [0]
+
+    return (LEN_LAST_TO_TYPE[len(cnt)][cnt[-1] + hand.count(joker)],) + tuple(
+        values[c] for c in hand
+    )
+
 
 lines = sys.stdin.read().splitlines()
+cards = [(t[0], int(t[1])) for line in lines if (t := line.split())]
+
 
 # part 1
-answer_1 = ...
+values = {card: value for value, card in enumerate("23456789TJQKA")}
+cards.sort(key=lambda cv: extract_key(cv[0], values=values))
+answer_1 = sum(rank * value for rank, (_, value) in enumerate(cards, start=1))
 print(f"answer 1 is {answer_1}")
 
 # part 2
-answer_2 = ...
+values = {card: value for value, card in enumerate("J23456789TQKA")}
+cards.sort(key=lambda cv: extract_key(cv[0], values=values, joker="J"))
+answer_2 = sum(rank * value for rank, (_, value) in enumerate(cards, start=1))
 print(f"answer 2 is {answer_2}")

2023/tests/day7.txt

@@ -0,0 +1,5 @@
+32T3K 765
+T55J5 684
+KK677 28
+KTJJT 220
+QQQJA 483