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day07.rs
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day07.rs
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use crate::data::load;
use std::{cmp::Ordering, collections::HashMap, hash::Hash, iter::zip};
use thiserror::Error;
#[derive(Error, Debug, PartialEq, Eq)]
pub enum PuzzleErr<'a> {
#[error("Input parsing error: '{}'.", .0)]
InputParsingError(&'a str),
#[error("Unrecognized card.")]
UnknownCard,
}
trait FromStr {
fn from_str(s: char) -> Result<Self, PuzzleErr<'static>>
where
Self: Sized;
}
trait Card: Clone + Copy + PartialEq + Eq + PartialOrd + Ord + core::hash::Hash + FromStr {}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
enum Card1 {
N2,
N3,
N4,
N5,
N6,
N7,
N8,
N9,
T,
J,
Q,
K,
A,
}
impl Card for Card1 {}
impl FromStr for Card1 {
fn from_str(s: char) -> Result<Self, PuzzleErr<'static>> {
match s {
'2' => Ok(Self::N2),
'3' => Ok(Self::N3),
'4' => Ok(Self::N4),
'5' => Ok(Self::N5),
'6' => Ok(Self::N6),
'7' => Ok(Self::N7),
'8' => Ok(Self::N8),
'9' => Ok(Self::N9),
'T' => Ok(Self::T),
'J' => Ok(Self::J),
'Q' => Ok(Self::Q),
'K' => Ok(Self::K),
'A' => Ok(Self::A),
_ => Err(PuzzleErr::UnknownCard),
}
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
enum Card2 {
J,
N2,
N3,
N4,
N5,
N6,
N7,
N8,
N9,
T,
Q,
K,
A,
}
impl FromStr for Card2 {
fn from_str(s: char) -> Result<Self, PuzzleErr<'static>> {
match Card1::from_str(s) {
Ok(Card1::N2) => Ok(Self::N2),
Ok(Card1::N3) => Ok(Self::N3),
Ok(Card1::N4) => Ok(Self::N4),
Ok(Card1::N5) => Ok(Self::N5),
Ok(Card1::N6) => Ok(Self::N6),
Ok(Card1::N7) => Ok(Self::N7),
Ok(Card1::N8) => Ok(Self::N8),
Ok(Card1::N9) => Ok(Self::N9),
Ok(Card1::T) => Ok(Self::T),
Ok(Card1::J) => Ok(Self::J),
Ok(Card1::Q) => Ok(Self::Q),
Ok(Card1::K) => Ok(Self::K),
Ok(Card1::A) => Ok(Self::A),
Err(e) => Err(e),
}
}
}
impl Card for Card2 {}
fn count<T: std::hash::Hash + std::cmp::Eq + Copy>(v: &[T]) -> HashMap<T, u32> {
let mut map = HashMap::new();
for x in v.iter() {
map.entry(*x).and_modify(|a| *a += 1_u32).or_insert(1_u32);
}
map
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
enum HandType {
High,
OnePair,
TwoPair,
ThreeKind,
FullHouse,
FourKind,
FiveKind,
}
#[derive(Debug, Clone)]
struct Hand<C: Card> {
cards: Vec<C>,
bid: u32,
}
impl<C: Card> Hand<C> {
fn new(cards: Vec<C>, bid: u32) -> Self {
Self { cards, bid }
}
}
trait GetHandType {
fn hand_type(&self) -> HandType;
}
fn _card_count_to_hand_type<T: core::hash::Hash>(counts: &HashMap<T, u32>) -> HandType {
match counts.len() {
1 => HandType::FiveKind,
2 => match counts.values().max().unwrap() {
3 => HandType::FullHouse,
4 => HandType::FourKind,
_ => panic!("Logic error in card_count = 2."),
},
3 => match counts.values().max().unwrap() {
3 => HandType::ThreeKind,
2 => HandType::TwoPair,
_ => panic!("Logic error in card_count = 3."),
},
4 => HandType::OnePair,
5 => HandType::High,
_ => panic!("Too many cards in a hand."),
}
}
impl GetHandType for Hand<Card1> {
fn hand_type(&self) -> HandType {
let card_count = count(&self.cards);
_card_count_to_hand_type(&card_count)
}
}
impl GetHandType for Hand<Card2> {
fn hand_type(&self) -> HandType {
let mut card_count = count(&self.cards);
if card_count.len() == 1 {
return HandType::FiveKind;
}
if let Some(num_jokers) = card_count.clone().get(&Card2::J) {
card_count.remove(&Card2::J);
let max_count = card_count.values().max().unwrap();
let top_cards = card_count
.iter()
.filter(|(_, v)| v == &max_count)
.map(|(k, _)| k)
.collect::<Vec<_>>();
let top_card = top_cards.first().unwrap();
card_count
.entry(**top_card)
.and_modify(|x| *x += num_jokers);
}
_card_count_to_hand_type(&card_count)
}
}
impl<C: Card> Ord for Hand<C>
where
Hand<C>: GetHandType,
{
fn cmp(&self, other: &Self) -> Ordering {
if self.cards == other.cards {
return Ordering::Equal;
}
match self.hand_type().cmp(&other.hand_type()) {
Ordering::Equal => {
for (a, b) in zip(&self.cards, &other.cards) {
if a != b {
return a.cmp(b);
}
}
panic!("Logic error in hand comparison.")
}
cmp_result => cmp_result,
}
}
}
impl<C: Card> PartialOrd for Hand<C>
where
Hand<C>: GetHandType,
{
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl<C: Card> PartialEq for Hand<C> {
fn eq(&self, other: &Self) -> bool {
self.cards == other.cards
}
}
impl<C: Card> Eq for Hand<C> {}
fn _line_to_hand<C: Card>(line: &str) -> Result<Hand<C>, PuzzleErr>
where
C: Clone + Copy + PartialEq + Eq + PartialOrd + Ord + core::hash::Hash,
{
let split_str = line.split_whitespace().collect::<Vec<_>>();
let cards = split_str[0]
.chars()
.map(C::from_str)
.collect::<Result<Vec<_>, PuzzleErr>>()?;
let bid = split_str[1]
.parse::<u32>()
.or(Err(PuzzleErr::InputParsingError(line)))?;
Ok(Hand::new(cards, bid))
}
fn parse_input<C: Card>(input: &str) -> Result<Vec<Hand<C>>, PuzzleErr> {
input.trim().lines().map(_line_to_hand).collect()
}
fn score_hands<C: Card>(cards: &mut [Hand<C>]) -> u32
where
Hand<C>: GetHandType,
{
cards.sort();
cards
.iter()
.enumerate()
.map(|(i, h)| (i as u32 + 1) * h.bid)
.sum()
}
pub fn puzzle_1(input: &str) -> Result<u32, PuzzleErr> {
Ok(score_hands(&mut parse_input::<Card1>(input)?))
}
pub fn puzzle_2(input: &str) -> Result<u32, PuzzleErr> {
Ok(score_hands(&mut parse_input::<Card2>(input)?))
}
pub fn main(data_dir: &str) {
println!("Day 7: Camel Cards");
let data = load(data_dir, 7, None);
// Puzzle 1.
let answer_1 = puzzle_1(&data);
match answer_1 {
Ok(x) => println!(" Puzzle 1: {}", x),
Err(e) => panic!("No solution to puzzle 1: {}.", e),
}
assert_eq!(answer_1, Ok(254024898));
// Puzzle 2.
let answer_2 = puzzle_2(&data);
match answer_2 {
Ok(x) => println!(" Puzzle 2: {}", x),
Err(e) => panic!("No solution to puzzle 2: {}", e),
}
assert_eq!(answer_2, Ok(254115617))
}