day 7 part 2

src/bin/day7.rs

@@ -1,3 +1,4 @@
+#![allow(clippy::no_effect)]
 #![forbid(elided_lifetimes_in_paths, unsafe_code)]
 
 use aoc23::read;
@@ -13,6 +14,10 @@ macro_rules! cards {
 		enum Card { $($ident),+ }
 
 		impl Card {
+			fn all_cards() -> [Self; 0 $(+ { $char; 1 })+] {
+				[$(Self::$ident),+]
+			}
+
 			fn parser() -> impl Parser<char, Self, Error = Simple<char>> {
 				choice((
 					$(just($char).map(|_| Self::$ident)),+
@@ -31,6 +36,7 @@ macro_rules! cards {
 }
 
 cards! {
+	Joker = '*',
 	Two = '2',
 	Three = '3',
 	Four = '4',
@@ -74,27 +80,39 @@ struct Hand {
 impl Hand {
 	fn new(cards: [Card; 5], bid: usize) -> Self {
 		let mut counts: HashMap<Card, usize> = HashMap::new();
+		let mut jokers = 0;
 		for card in cards {
-			*counts.entry(card).or_default() += 1;
+			if card == Card::Joker {
+				jokers += 1;
+			} else {
+				*counts.entry(card).or_default() += 1;
+			}
+		}
+		match counts.values_mut().max() {
+			Some(max) => {
+				*max += jokers;
+			},
+			None => {
+				counts.insert(Card::Joker, jokers);
+			}
 		}
 
-		let ty = if counts.values().any(|c| *c == 5) {
+		let ty = if counts.values().any(|c| *c >= 5) {
 			Type::FiveOfAKind
-		} else if counts.values().any(|c| *c == 4) {
+		} else if counts.values().any(|c| *c >= 4) {
 			Type::FourOfAKind
-		} else if counts.values().any(|c| *c == 3) {
-			if counts.values().any(|c| *c == 2) {
+		} else if counts.values().any(|c| *c >= 3) {
+			if counts.values().filter(|c| **c >= 2).count() >= 2 {
 				Type::FullHouse
 			} else {
 				Type::ThreeOfAKind
 			}
 		} else {
-			let pairs = counts.values().filter(|c| **c == 2).count();
+			let pairs = counts.values().filter(|c| **c >= 2).count();
 			match pairs {
-				2 => Type::TwoPair,
-				1 => Type::OnePair,
 				0 => Type::HighCard,
-				_ => unreachable!()
+				1 => Type::OnePair,
+				_ => Type::TwoPair
 			}
 		};
 
@@ -120,20 +138,43 @@ fn parser() -> impl Parser<char, Vec<Hand>, Error = Simple<char>> {
 		.then_ignore(end())
 }
 
+fn sum_hands<'a>(hands: impl IntoIterator<Item = &'a Hand>) -> usize {
+	hands
+		.into_iter()
+		.enumerate()
+		.map(|(i, hand)| (i + 1) * hand.bid)
+		.sum::<usize>()
+}
+
 fn main() -> anyhow::Result<()> {
 	let hands = read("inputs/day7.txt", parser())?;
 	// eprintln!("{hands:?}");
 
 	let sorted: BTreeSet<&Hand> = hands.iter().collect();
 	// eprintln!("{sorted:?}");
-	println!(
-		"{}",
-		sorted
-			.into_iter()
-			.enumerate()
-			.map(|(i, hand)| (i + 1) * hand.bid)
-			.sum::<usize>()
-	);
+	let sum = sum_hands(sorted);
+	println!("{sum}");
+	// assert_eq!(sum, 251106089);
+
+	let sorted: BTreeSet<Hand> = hands
+		.iter()
+		.map(|hand| {
+			let mut cards = hand.cards;
+			for card in &mut cards {
+				if *card == Card::Junior {
+					*card = Card::Joker;
+				}
+			}
+			let hand = Hand::new(cards, hand.bid);
+			// eprintln!("{hand:?}");
+			hand
+		})
+		.collect();
+	// eprintln!("{sorted:#?}");
+	let sum = sum_hands(&sorted);
+	println!("{sum}");
+	// assert!(sum > 249135400);
+	// assert!(sum < 249779500);
 
 	Ok(())
 }