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use std::{cmp::Ordering, collections::HashMap};
use std::sync::Mutex;
static DAY: u8 = 7;
static J_IS_JOKER: Mutex<bool> = Mutex::new(false);
fn main() {
let input = advent::read_lines(DAY);
println!("{DAY}a: {}", winnings_no_joker(&input));
println!("{DAY}b: {}", winnings_joker(&input));
}
fn j_is_joker() -> bool {
*J_IS_JOKER.lock().unwrap()
}
#[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
enum Card {
Joker,
Two,
Three,
Four,
Five,
Six,
Seven,
Eight,
Nine,
Ten,
Jack,
Queen,
King,
Ace,
}
impl Card {
fn new(c: char) -> Card {
match c {
'A' => Card::Ace,
'K' => Card::King,
'Q' => Card::Queen,
'J' => if j_is_joker() { Card::Joker } else { Card::Jack },
'T' => Card::Ten,
'9' => Card::Nine,
'8' => Card::Eight,
'7' => Card::Seven,
'6' => Card::Six,
'5' => Card::Five,
'4' => Card::Four,
'3' => Card::Three,
'2' => Card::Two,
_ => panic!("invalid card character"),
}
}
}
#[derive(PartialEq, Eq, PartialOrd, Ord)]
enum HandType {
HighCard,
OnePair,
TwoPair,
ThreeOfAKind,
FullHouse,
FourOfAKind,
FiveOfAKind,
}
impl HandType {
fn from(hand: &Hand) -> HandType {
let mut card_counts = HashMap::new();
for card in &hand.cards {
*card_counts.entry(card).or_insert(0) += 1;
}
let has_count = |c| {
card_counts.values().any(|x| *x == c)
};
if has_count(5) {
HandType::FiveOfAKind
} else if has_count(4) {
HandType::FourOfAKind
} else if has_count(3) && has_count(2) {
HandType::FullHouse
} else if has_count(3) {
HandType::ThreeOfAKind
} else if has_count(2) && card_counts.len() == 3 {
HandType::TwoPair
} else if has_count(2) {
HandType::OnePair
} else {
HandType::HighCard
}
}
fn from_joker(hand: &Hand) -> HandType {
let mut card_counts = HashMap::new();
for card in &hand.cards {
*card_counts.entry(card).or_insert(0) += 1;
}
let has_count = |c| {
card_counts.iter().filter(|&(&card, &count)| *card != Card::Joker && count == c).count() > 0
};
let jokers = *card_counts.get(&Card::Joker).unwrap_or(&0);
if has_count(5) || (has_count(4) && jokers >= 1) || (has_count(3) && jokers >= 2) || (has_count(2) && jokers >= 3) || jokers >= 4 {
HandType::FiveOfAKind
} else if has_count(4) || (has_count(3) && jokers >= 1) || (has_count(2) && jokers >= 2) || jokers >= 3 {
HandType::FourOfAKind
} else if (has_count(3) && has_count(2)) || (has_count(2) && jokers == 1 && card_counts.len() == 3) {
HandType::FullHouse
} else if has_count(3) || (has_count(2) && jokers >= 1) || jokers >= 2 {
HandType::ThreeOfAKind
} else if has_count(2) && card_counts.len() == 3 {
HandType::TwoPair
} else if has_count(2) || (card_counts.len() == 5 && jokers == 1) {
HandType::OnePair
} else {
HandType::HighCard
}
}
}
struct Hand {
cards: [Card; 5],
bid: u32,
}
impl Hand {
fn new(input: &str) -> Hand {
let (values, bid) = input.split_once(' ').unwrap();
assert_eq!(values.len(), 5);
let mut cards = [Card::Two; 5];
for (i, c) in values.chars().enumerate() {
cards[i] = Card::new(c);
}
let bid = bid.parse().unwrap();
Hand { cards, bid }
}
fn hand_type(&self) -> HandType {
if j_is_joker() {
HandType::from_joker(self)
} else {
HandType::from(self)
}
}
}
impl PartialEq for Hand {
fn eq(&self, other: &Self) -> bool {
self.cards == other.cards
}
}
impl Eq for Hand {}
impl PartialOrd for Hand {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl Ord for Hand {
fn cmp(&self, other: &Self) -> Ordering {
let self_type = self.hand_type();
let other_type = other.hand_type();
if self_type == other_type {
/* same hand type -> first highest card wins */
for (self_card, other_card) in self.cards.iter().zip(other.cards.iter()) {
if self_card == other_card {
continue;
}
return self_card.cmp(other_card);
}
panic!("no ordering found for hand");
}
self_type.cmp(&other_type)
}
}
fn winnings(input: &[String]) -> u32 {
let mut hands = input.iter()
.map(|x| Hand::new(x))
.collect::<Vec<_>>();
hands.sort_unstable();
hands.iter()
.enumerate()
.map(|(i, hand)| (i as u32 + 1) * hand.bid)
.sum()
}
fn winnings_no_joker(input: &[String]) -> u32 {
*J_IS_JOKER.lock().unwrap() = false;
winnings(input)
}
fn winnings_joker(input: &[String]) -> u32 {
*J_IS_JOKER.lock().unwrap() = true;
winnings(input)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test() {
let input = [
"32T3K 765",
"T55J5 684",
"KK677 28",
"KTJJT 220",
"QQQJA 483",
].iter().map(|&x| String::from(x)).collect::<Vec<_>>();
assert_eq!(winnings_no_joker(&input), 6440);
assert_eq!(winnings_joker(&input), 5905);
}
}
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