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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| 32T3K 765 | ||
| T55J5 684 | ||
| KK677 28 | ||
| KTJJT 220 | ||
| QQQJA 483 |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,187 @@ | ||
| use itertools::Itertools; | ||
| advent_of_code::solution!(7); | ||
|
|
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| #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)] | ||
| enum HandStrength { | ||
| FiveOfAKind, | ||
| FourOfAKind, | ||
| FullHouse, | ||
| ThreeOfAKind, | ||
| TwoPair, | ||
| OnePair, | ||
| HighCard, | ||
| } | ||
|
|
||
| type Hand = [usize; 5]; | ||
|
|
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| impl From<&Hand> for HandStrength { | ||
| fn from(hand: &Hand) -> Self { | ||
| let occurrence_of_cards = hand.iter().counts(); | ||
|
|
||
| match occurrence_of_cards.len() { | ||
| 1 => HandStrength::FiveOfAKind, | ||
| 2 => match occurrence_of_cards.values().next().unwrap() { | ||
| 1 | 4 => HandStrength::FourOfAKind, | ||
| 2 | 3 => HandStrength::FullHouse, | ||
| _ => panic!(), | ||
| }, | ||
| 3 => match occurrence_of_cards.values().max().unwrap() { | ||
| 3 => HandStrength::ThreeOfAKind, | ||
| 2 => HandStrength::TwoPair, | ||
| _ => panic!(), | ||
| }, | ||
| 4 => HandStrength::OnePair, | ||
| 5 => HandStrength::HighCard, | ||
| _ => panic!(), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| pub fn part_one(input: &str) -> Option<usize> { | ||
| let mut number_of_lines = 0; | ||
|
|
||
| Some( | ||
| input | ||
| .lines() | ||
| .filter_map(|line| line.split_once(' ')) | ||
| .map(|(hand, bid)| (hand, bid.parse::<usize>().unwrap())) | ||
| .map(|(hand, bid)| { | ||
| let hand: Hand = hand | ||
| .chars() | ||
| .map(|char| match char { | ||
| 'A' => 1, | ||
| 'K' => 2, | ||
| 'Q' => 3, | ||
| 'J' => 4, | ||
| 'T' => 5, | ||
| '9' => 6, | ||
| '8' => 7, | ||
| '7' => 8, | ||
| '6' => 9, | ||
| '5' => 10, | ||
| '4' => 11, | ||
| '3' => 12, | ||
| '2' => 13, | ||
| _ => panic!(), | ||
| }) | ||
| .collect::<Vec<_>>() | ||
| .try_into() | ||
| .unwrap(); | ||
|
|
||
| let strength = HandStrength::from(&hand); | ||
|
|
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| number_of_lines += 1; | ||
|
|
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| (hand, strength, bid) | ||
| }) | ||
| .sorted_by_key(|(hand, strength, _)| (*strength, *hand)) | ||
| .enumerate() | ||
| .map(|(index, (_, _, bid))| (number_of_lines - index) * bid) | ||
| .sum(), | ||
| ) | ||
| } | ||
|
|
||
| pub fn part_two(input: &str) -> Option<usize> { | ||
| let mut number_of_lines = 0; | ||
|
|
||
| Some( | ||
| input | ||
| .lines() | ||
| .filter_map(|line| line.split_once(' ')) | ||
| .map(|(hand, bid)| (hand, bid.parse::<usize>().unwrap())) | ||
| .map(|(hand, bid)| { | ||
| number_of_lines += 1; | ||
|
|
||
| let hand: Hand = hand | ||
| .chars() | ||
| .map(|char| match char { | ||
| 'A' => 1, | ||
| 'K' => 2, | ||
| 'Q' => 3, | ||
| 'T' => 4, | ||
| '9' => 5, | ||
| '8' => 6, | ||
| '7' => 7, | ||
| '6' => 8, | ||
| '5' => 9, | ||
| '4' => 10, | ||
| '3' => 11, | ||
| '2' => 12, | ||
| 'J' => 13, | ||
| _ => panic!(), | ||
| }) | ||
| .collect::<Vec<_>>() | ||
| .try_into() | ||
| .unwrap(); | ||
|
|
||
| let number_of_jokers: usize = hand.iter().filter(|value| **value == 13).count(); | ||
|
|
||
| let strength = match HandStrength::from(&hand) { | ||
| HandStrength::FiveOfAKind => match number_of_jokers { | ||
| 0 => HandStrength::FiveOfAKind, | ||
| 5 => HandStrength::FiveOfAKind, | ||
| _ => panic!(), | ||
| }, | ||
| HandStrength::FourOfAKind => match number_of_jokers { | ||
| 0 => HandStrength::FourOfAKind, | ||
| 1 => HandStrength::FiveOfAKind, | ||
| 4 => HandStrength::FiveOfAKind, | ||
| _ => panic!(), | ||
| }, | ||
| HandStrength::FullHouse => match number_of_jokers { | ||
| 0 => HandStrength::FullHouse, | ||
| 2 => HandStrength::FiveOfAKind, | ||
| 3 => HandStrength::FiveOfAKind, | ||
| _ => panic!(), | ||
| }, | ||
| HandStrength::ThreeOfAKind => match number_of_jokers { | ||
| 0 => HandStrength::ThreeOfAKind, | ||
| 1 => HandStrength::FourOfAKind, | ||
| 2 => HandStrength::FiveOfAKind, | ||
| 3 => HandStrength::FourOfAKind, | ||
| _ => panic!(), | ||
| }, | ||
| HandStrength::TwoPair => match number_of_jokers { | ||
| 0 => HandStrength::TwoPair, | ||
| 1 => HandStrength::FullHouse, | ||
| 2 => HandStrength::FourOfAKind, | ||
| _ => panic!(), | ||
| }, | ||
| HandStrength::OnePair => match number_of_jokers { | ||
| 0 => HandStrength::OnePair, | ||
| 1 => HandStrength::ThreeOfAKind, | ||
| 2 => HandStrength::ThreeOfAKind, | ||
| _ => panic!(), | ||
| }, | ||
| HandStrength::HighCard => match number_of_jokers { | ||
| 0 => HandStrength::HighCard, | ||
| 1 => HandStrength::OnePair, | ||
| _ => panic!(), | ||
| }, | ||
| }; | ||
|
|
||
| (hand, strength, bid) | ||
| }) | ||
| .sorted_by_key(|(hand, strength, _)| (*strength, *hand)) | ||
| .enumerate() | ||
| .map(|(index, (_, _, bid))| (number_of_lines - index) * bid) | ||
| .sum(), | ||
| ) | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
|
|
||
| #[test] | ||
| fn test_part_one() { | ||
| let result = part_one(&advent_of_code::template::read_file("examples", DAY)); | ||
| assert_eq!(result, Some(6440)); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_part_two() { | ||
| let result = part_two(&advent_of_code::template::read_file("examples", DAY)); | ||
| assert_eq!(result, Some(5905)); | ||
| } | ||
| } |