feat: solve day 22

22/input.txt

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+Player 1:
+18
+19
+16
+11
+47
+38
+6
+27
+9
+22
+15
+42
+3
+4
+21
+41
+14
+8
+23
+30
+40
+13
+35
+46
+50
+
+Player 2:
+39
+1
+29
+20
+45
+43
+12
+2
+37
+33
+49
+32
+10
+26
+36
+17
+34
+44
+25
+28
+24
+5
+48
+31
+7

22/main.py

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+
+
+def read_input(filename: str) -> tuple[list[int], list[int]]:
+    with open(filename, "r") as f:
+        player1, player2 = f.read().split("\n\n")
+        player1_cards = list(int(l) for l in player1.splitlines()[1:])
+        player2_cards = list(int(l) for l in player2.splitlines()[1:])
+        return (player1_cards, player2_cards)
+
+def play_combat(player1: list[int], player2: list[int]) -> list[int]:
+    while len(player1) > 0 and len(player2) > 0:
+        card1 = player1.pop(0)
+        card2 = player2.pop(0)
+        if card1 > card2:
+            player1.append(card1)
+            player1.append(card2)
+        else:
+            player2.append(card2)
+            player2.append(card1)
+
+    return max(player1, player2)
+
+def play_recursive_combat(player1: list[int], player2: list[int]) -> tuple[list[int], bool]:
+    seen_games = set()
+
+    while len(player1) > 0 and len(player2) > 0:
+        seen_game_value = (",".join(map(str, player1)), ",".join(map(str, player2)))
+        if seen_game_value in seen_games:
+            return player1, True
+
+        seen_games.add(seen_game_value)
+
+        card1 = player1.pop(0)
+        card2 = player2.pop(0)
+
+        player1_won = None
+        if len(player1) >= card1 and len(player2) >= card2:
+            _, player1_won = play_recursive_combat(player1[:card1], player2[:card2])
+        else:
+            player1_won = card1 > card2
+
+        if player1_won:
+            player1.append(card1)
+            player1.append(card2)
+        else:
+            player2.append(card2)
+            player2.append(card1)
+
+    return max(player1, player2), len(player2) == 0
+
+def calculate_score(cards: list[int]) -> int:
+    score = 0
+    for i in range(len(cards)):
+        score += cards[i] * (len(cards)-i)
+    return score
+
+def part1(player1: list[int], player2: list[int]) -> int:
+    winning_cards = play_combat(player1.copy(), player2.copy())
+    return calculate_score(winning_cards)
+
+def part2(player1: list[int], player2: list[int]) -> int:
+    winning_cards, _ = play_recursive_combat(player1.copy(), player2.copy())
+    return calculate_score(winning_cards)
+
+if __name__ == "__main__":
+    player1, player2 = read_input("input.txt")
+    print("part1: ", part1(player1, player2))
+    print("part2: ", part2(player1, player2))

22/test.txt

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+Player 1:
+9
+2
+6
+3
+1
+
+Player 2:
+5
+8
+4
+7
+10