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use std::{collections::HashMap, str::FromStr};
#[derive(Debug, PartialEq, PartialOrd, Eq, Hash)]
enum HandType {
Five,
Four,
Full,
Three,
Two,
One,
High,
}
#[derive(Debug)]
struct Play {
hand: Vec<u32>,
bid: u32,
hand_type: HandType,
}
#[derive(Debug)]
struct PlayError;
impl FromStr for Play {
type Err = PlayError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
if !s.contains(' ') {
return Err(PlayError);
}
let s: Vec<String> = s.split(' ').map(|x| x.to_string()).collect();
if s.len() != 2 {
return Err(PlayError);
}
let mut diffcards: HashMap<char, u32> = HashMap::new();
let hand = s[0].chars().collect::<Vec<char>>();
for ch in &hand {
if diffcards.contains_key(&ch) {
*(diffcards.get_mut(ch).unwrap()) += 1;
} else {
diffcards.insert(*ch, 1);
}
}
let card_points: HashMap<char, u32> = HashMap::from([
('A', 13),
('K', 12),
('Q', 11),
('T', 9),
('9', 8),
('8', 7),
('7', 6),
('6', 5),
('5', 4),
('4', 3),
('3', 2),
('2', 1),
('J', 0),
]);
let hand: Vec<_> = hand.iter().map(|x| *card_points.get(&x).unwrap()).collect();
let jokers = hand.iter().filter(|&n| *n == 0).count();
let b: Vec<u32> = diffcards.clone().into_values().collect();
let max_labels: u32 = *b.iter().max().unwrap();
let mut hand_type: HandType = match diffcards.keys().len() {
1 => HandType::Five,
2 if max_labels == 4 => HandType::Four,
2 if max_labels == 3 => HandType::Full,
3 if max_labels == 3 => HandType::Three,
3 => HandType::Two,
4 => HandType::One,
5 => HandType::High,
_ => panic!("wtf is this?"),
};
match jokers {
1 => {
hand_type = match hand_type {
HandType::High => HandType::One,
HandType::One => HandType::Three,
HandType::Two => HandType::Full,
HandType::Three => HandType::Four,
HandType::Four => HandType::Five,
_ => panic!("wtf is this?"),
}
}
2 => {
hand_type = match hand_type {
HandType::One => HandType::Three,
HandType::Two => HandType::Four,
HandType::Full => HandType::Five,
_ => panic!("wtf is this?"),
}
}
3 => {
hand_type = match hand_type {
HandType::High => HandType::Three,
HandType::One => HandType::Four,
HandType::Two => HandType::Five,
HandType::Three => HandType::Four,
HandType::Full => HandType::Five,
_ => panic!("wtf is this?"),
}
}
4 => {
hand_type = HandType::Five;
}
0 | 5 => {}
_ => panic!("wtf is this?"),
};
Ok(Play {
hand,
bid: s[1].parse::<u32>().unwrap(),
hand_type,
})
}
}
pub fn part2(input: &str) -> u32 {
let mut res: u32 = 0;
let plays: Vec<_> = input
.trim_end()
.split('\n')
.map(|x| x.parse::<Play>().unwrap())
.collect();
let mut hs: HashMap<HandType, Vec<Play>> = HashMap::from([
(HandType::Five, vec![]),
(HandType::Four, vec![]),
(HandType::Full, vec![]),
(HandType::Three, vec![]),
(HandType::Two, vec![]),
(HandType::One, vec![]),
(HandType::High, vec![]),
]);
for play in plays {
if let Some(p) = hs.get_mut(&play.hand_type) {
p.push(play);
}
}
let mut rank = 1;
for kind in [
HandType::High,
HandType::One,
HandType::Two,
HandType::Three,
HandType::Full,
HandType::Four,
HandType::Five,
] {
hs.get_mut(&kind)
.unwrap()
.sort_by(|a, b| a.hand.partial_cmp(&b.hand).unwrap());
for h in hs.get(&kind).unwrap() {
res += rank * h.bid;
rank += 1;
}
}
res
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn example_part2() {
let input = include_str!("../example.txt");
let result = part2(input);
assert_eq!(result, 5905);
}
#[test]
fn input_part2() {
let input = include_str!("../input.txt");
let result = part2(input);
assert_eq!(result, 247885995);
}
}
|
