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use std::cmp::max;
use std::cmp::Ordering;
use std::fs::File;
use std::io::Read;
#[derive(Debug)]
struct Hand {
cards: Vec<u8>,
ct: u32,
bid: u32,
}
fn count_cards(arr: &Vec<u8>) -> Vec<u32> {
let mut count = [0; 256].to_vec();
for a in arr {
count[*a as usize] += 1;
}
let mut count = count
.iter()
.filter(|x| **x != 0)
.copied()
.collect::<Vec<_>>();
count.sort();
count.reverse();
count
}
fn card_type(count: &Vec<u32>) -> u32 {
// returns card type from card count
if count[0] == 5 {
return 6;
} else if count[0] == 4 {
return 5;
} else if count[0] == 3 && count[1] == 2 {
return 4;
} else if count[0] == 3 {
return 3;
} else if count[0] == 2 && count[1] == 2 {
return 2;
} else if count[0] == 2 {
return 1;
} else {
return 0;
}
}
fn max_type(count: &Vec<u32>, joker: u32) -> u32 {
if joker == 0 {
return card_type(count);
} else {
let mut mt = 0;
for i in 0..count.len() {
let mut c = count.to_vec();
c[i] += 1;
mt = max(mt, max_type(&c, joker - 1));
}
return mt;
}
}
fn get_card_type(c: &Vec<u8>) -> u32 {
let c_noj: Vec<u8> = c.iter().filter(|x| **x != 0).copied().collect();
let joker = c
.iter()
.fold(0, |acc, x| if *x == 0 { acc + 1 } else { acc });
let mut count = count_cards(&c_noj);
count.push(0);
max_type(&count, joker)
}
fn compare_cards(c1: &Vec<u8>, type1: u32, c2: &Vec<u8>, type2: u32) -> Ordering {
if type1 > type2 {
return Ordering::Greater;
} else if type1 < type2 {
return Ordering::Less;
} else {
for (e1, e2) in c1.iter().zip(c2.iter()) {
if e1 > e2 {
return Ordering::Greater;
} else if e1 < e2 {
return Ordering::Less;
}
}
}
Ordering::Equal
}
fn string_to_card(s: &str) -> Vec<u8> {
// let map = [
// '2', '3', '4', '5', '6', '7', '8', '9', 'T', 'J', 'Q', 'K', 'A',
// ];
let map = [
'J', '2', '3', '4', '5', '6', '7', '8', '9', 'T', 'Q', 'K', 'A',
];
let mut out = Vec::new();
for c in s.chars() {
out.push(map.iter().position(|x| x == &c).unwrap() as u8);
}
out
}
fn main() {
// let filename = "in/day07.ref";
let filename = "in/day07.pzl";
let mut f = File::open(filename).expect("cannot open file");
let mut content = String::new();
f.read_to_string(&mut content).expect("cannot read file");
let lines: Vec<_> = content.trim_end().split('\n').collect();
let mut hands: Vec<Hand> = Vec::new();
for line in lines.iter() {
let (cards, bid) = line.split_once(" ").unwrap();
let cards = string_to_card(cards);
hands.push(Hand {
cards: cards.clone(),
bid: bid.parse().unwrap(),
ct: get_card_type(&cards),
});
}
hands.sort_by(|x, y| compare_cards(&x.cards, x.ct, &y.cards, y.ct));
let mut res1 = 0;
let mut res2 = 0;
for (i, h) in hands.iter().enumerate() {
// println!("{:?} {}", h.cards, h.ct);
res2 += (i as u32 + 1) * h.bid;
}
println!("res1: {}", res1);
println!("res2: {}", res2);
}
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