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use std::{cmp::Ordering, collections::HashMap, marker::PhantomData};
struct One;
struct Two;
#[derive(Debug, PartialEq, PartialOrd, Ord, Eq)]
struct Round<'a> {
hand: Hand<'a>,
bid: usize,
}
#[derive(Debug, Eq, Clone, Copy, Ord)]
enum Hand<'a> {
FiveOfKind(&'a str),
FourOfKind(&'a str),
FullHouse(&'a str),
ThreeOfKind(&'a str),
TwoPair(&'a str),
OnePair(&'a str),
HighCard(&'a str),
}
#[derive(Debug, Eq, Clone, Copy, Ord)]
enum HandJokers<'a> {
FiveOfKind(&'a str),
FourOfKind(&'a str),
FullHouse(&'a str),
ThreeOfKind(&'a str),
TwoPair(&'a str),
OnePair(&'a str),
HighCard(&'a str),
}
const LABELS: [char; 13] = [
'2', '3', '4', '5', '6', '7', '8', '9', 'T', 'J', 'Q', 'K', 'A',
];
fn stronger(a: &str, b: &str) -> Option<Ordering> {
for (first, second) in a.chars().zip(b.chars()) {
let pos_first = LABELS.iter().position(|&x| x == first);
let pos_second = LABELS.iter().position(|&x| x == second);
if pos_first > pos_second {
return Some(Ordering::Greater);
} else if pos_second > pos_first {
return Some(Ordering::Less);
}
}
Some(Ordering::Equal)
}
impl<'a> PartialEq for Hand<'a> {
fn eq(&self, other: &Self) -> bool {
use Hand::*;
match (self, other) {
(FiveOfKind(a), FiveOfKind(b)) => a == b,
(FourOfKind(a), FourOfKind(b)) => a == b,
(FullHouse(a), FullHouse(b)) => a == b,
(ThreeOfKind(a), ThreeOfKind(b)) => a == b,
(TwoPair(a), TwoPair(b)) => a == b,
(OnePair(a), OnePair(b)) => a == b,
(HighCard(a), HighCard(b)) => a == b,
(_, _) => false,
}
}
}
impl<'a> PartialOrd for Hand<'a> {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
use Hand::*;
match (self, other) {
(FiveOfKind(a), FiveOfKind(b)) => stronger(a, b),
(FiveOfKind(_), _) => Some(Ordering::Greater),
(_, FiveOfKind(_)) => Some(Ordering::Less),
(FourOfKind(a), FourOfKind(b)) => stronger(a, b),
(FourOfKind(_), _) => Some(Ordering::Greater),
(_, FourOfKind(_)) => Some(Ordering::Less),
(FullHouse(a), FullHouse(b)) => stronger(a, b),
(FullHouse(_), _) => Some(Ordering::Greater),
(_, FullHouse(_)) => Some(Ordering::Less),
(ThreeOfKind(a), ThreeOfKind(b)) => stronger(a, b),
(ThreeOfKind(_), _) => Some(Ordering::Greater),
(_, ThreeOfKind(_)) => Some(Ordering::Less),
(TwoPair(a), TwoPair(b)) => stronger(a, b),
(TwoPair(_), _) => Some(Ordering::Greater),
(_, TwoPair(_)) => Some(Ordering::Less),
(OnePair(a), OnePair(b)) => stronger(a, b),
(OnePair(_), _) => Some(Ordering::Greater),
(_, OnePair(_)) => Some(Ordering::Less),
(HighCard(a), HighCard(b)) => stronger(a, b),
(HighCard(_), _) => Some(Ordering::Greater),
(_, HighCard(_)) => Some(Ordering::Less),
(_, _) => None,
}
}
}
impl<'a> From<&'a str> for Round<'a> {
fn from(round: &'a str) -> Self {
let (hand, bid) = round.split_once(' ').unwrap();
let (hand, bid) = (Hand::from(hand), bid.parse::<usize>().unwrap());
Self { hand, bid }
}
}
impl<'a> From<&'a str> for Hand<'a> {
fn from(hand: &'a str) -> Self {
let mut frq: HashMap<char, usize> = HashMap::new();
for ch in hand.chars() {
frq.entry(ch).and_modify(|f| *f += 1).or_insert(1);
}
let mut two_pairs = 0;
let mut three_pairs = 0;
let mut four_pairs = 0;
for (_, val) in frq.iter() {
match val {
3 => three_pairs += 1,
2 => two_pairs += 1,
4 => four_pairs += 1,
_ => {}
}
}
match (frq.len(), two_pairs, three_pairs, four_pairs) {
(5, _, _, _) => Hand::HighCard(hand),
(4, _, _, _) => Hand::OnePair(hand),
(1, _, _, _) => Hand::FiveOfKind(hand),
(_, _, _, 1) => Hand::FourOfKind(hand),
(_, 0, 1, _) => Hand::ThreeOfKind(hand),
(_, 1, 1, _) => Hand::FullHouse(hand),
(_, 2, 0, _) => Hand::TwoPair(hand),
_ => {
unreachable!()
}
}
}
}
fn solve_part_one(data: &str) -> u64 {
let mut rounds = data
.lines()
.map(|line| Round::from(line))
.collect::<Vec<_>>();
rounds.sort_by(|b, a| a.hand.partial_cmp(&b.hand).unwrap());
let n = rounds.len();
rounds
.iter()
.enumerate()
.map(|(i, round)| round.bid * (n - i))
.sum::<usize>() as u64
}
fn solve_part_two(data: &str) -> u64 {
todo!()
}
fn main() {
let test = include_str!("../input/day7.test");
let prod = include_str!("../input/day7.prod");
// println!("part_1 test: {:?}", solve_part_one(test));
println!("part_1 prod {:?}", solve_part_one(prod));
// println!("part_2 test: {:?}", solve_part_two(test));
// println!("part_2 prod {:?}", solve_part_two(prod));
}
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