add 2023/07/2
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@ -26,7 +26,7 @@ fn parse_input(raw: &str) -> Parsed {
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(seeds, ranges)
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}
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fn resolve(start: I, mappings: &Vec<Mapping>) -> I {
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fn resolve(start: I, mappings: &[Mapping]) -> I {
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mappings.iter().fold(start, |i, map| map.iter().find_map(|(range, _, offset)| range.contains(&i).then_some(i + offset)).unwrap_or(i))
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}
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@ -34,7 +34,7 @@ fn part1((seeds, mappings): &Parsed) -> I {
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seeds.iter().map(|&s| resolve(s, mappings)).min().unwrap()
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}
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fn resolve_backwards(start: I, mappings: &Vec<Mapping>) -> I {
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fn resolve_backwards(start: I, mappings: &[Mapping]) -> I {
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mappings.iter().fold(start, |i, map| map.iter().find_map(|(_, range, offset)| range.contains(&i).then_some(i - offset)).unwrap_or(i))
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}
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@ -77,8 +77,8 @@ fn part2((seeds, mappings): &Parsed) -> I {
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.unwrap()
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}
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fn has_starting_seed(start: I, offset: i64, seed_ranges: &Vec<Range<I>>, mappings: &Vec<Mapping>) -> bool {
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let seed = resolve_backwards(start - offset, &mappings);
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fn has_starting_seed(start: I, offset: i64, seed_ranges: &[Range<I>], mappings: &[Mapping]) -> bool {
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let seed = resolve_backwards(start - offset, mappings);
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// If seed == s, the entire resolution didn’t hit a single mapping, so we don’t need to check seeds.
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seed != start && seed_ranges.iter().any(|r| r.contains(&seed))
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}
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@ -1,29 +1,48 @@
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#![feature(test)]
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extern crate test;
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use aoc2023::{boilerplate, common::*};
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use itertools::Itertools;
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const DAY: usize = 7;
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type I = usize;
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type Parsed = Vec<([I; 5], I, I)>;
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type Hand = [u8; 5];
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type Parsed = Vec<(Hand, I)>;
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const CARDS: [u8; 13] = [b'2', b'3', b'4', b'5', b'6', b'7', b'8', b'9', b'T', b'J', b'Q', b'K', b'A'];
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const CARDS_P2: [u8; 13] = [b'J', b'2', b'3', b'4', b'5', b'6', b'7', b'8', b'9', b'T', b'Q', b'K', b'A'];
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enum Quality {
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AllEqual = 1 << 30,
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Quad = 1 << 29,
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FullHouse = 1 << 28,
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Triple = 1 << 27,
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TwoPair = 1 << 26,
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Pair = 1 << 25,
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None = 1 << 24,
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}
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impl Quality {
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// How adding 1 joker raises the quality of a hand.
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fn upgrade(&self) -> Self {
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match self {
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Quality::AllEqual | Quality::Quad => Quality::AllEqual,
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Quality::Triple | Quality::FullHouse => Quality::Quad,
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Quality::TwoPair => Quality::FullHouse,
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Quality::Pair => Quality::Triple,
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Quality::None => Quality::Pair,
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}
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}
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}
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fn parse_input(raw: &str) -> Parsed {
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raw.lines()
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.map(|l| l.split_once(' ').unwrap())
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.map(|(hand, points)| {
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(<[_; 5]>::try_from(hand.as_bytes()).unwrap().map(|b| CARDS.iter().position(|&c| c == b).unwrap()), parse_num(points))
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})
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.map(|(hand, points)| (hand, points, hand.iter().fold(0, |acc, n| (acc << 4) + n)))
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.map(|(hand, points)| (<[_; 5]>::try_from(hand.as_bytes()).unwrap(), parse_num(points)))
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.collect()
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}
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fn part1(hands: &Parsed) -> usize {
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let mut rated_hands = hands
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.iter()
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.cloned()
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.map(|(mut hand, points, tiebreak)| {
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fn rate_hand(mut hand: Hand) -> Quality {
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hand.sort();
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let paired = hand
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.into_iter()
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@ -31,25 +50,56 @@ fn part1(hands: &Parsed) -> usize {
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.coalesce(|(c1, n1), (c2, n2)| if c1 == c2 { Ok((c1, n1 + n2)) } else { Err(((c1, n1), (c2, n2))) })
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.map(|(_, n)| n)
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.collect_vec();
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let value = match paired.as_slice() {
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[_] => (1 << 30) + tiebreak,
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[4, 1] | [1, 4] => (1 << 29) + tiebreak,
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[3, 2] | [2, 3] => (1 << 28) + tiebreak,
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[3, 1, 1] | [1, 3, 1] | [1, 1, 3] => (1 << 27) + tiebreak,
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// can only be 2 pair
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[_, _, _] => (1 << 26) + tiebreak,
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[_, _, _, _] => (1 << 25) + tiebreak,
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_ => (1 << 24) + tiebreak,
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};
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(value, points)
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match paired.as_slice() {
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[_] => Quality::AllEqual,
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[4, 1] | [1, 4] => Quality::Quad,
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[3, 2] | [2, 3] => Quality::FullHouse,
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a @ [_, _, _] if a.contains(&3) => Quality::Triple,
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[_, _, _] => Quality::TwoPair,
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[_, _, _, _] => Quality::Pair,
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_ => Quality::None,
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}
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}
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fn tiebreaker(hand: &Hand, values: &[u8; 13]) -> usize {
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let tiebreak_hand = hand.map(|b| values.iter().position(|&c| c == b).unwrap());
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tiebreak_hand.iter().fold(0, |acc, n| (acc << 4) + n)
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}
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fn part1(hands: &Parsed) -> usize {
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let mut rated_hands = hands
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.iter()
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.cloned()
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.map(|(hand, points)| {
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let tiebreak = tiebreaker(&hand, &CARDS);
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(rate_hand(hand) as usize + tiebreak, points)
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})
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.collect_vec();
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rated_hands.sort_unstable_by_key(|(v, _)| *v);
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rated_hands.into_iter().zip(1..).map(|((_, points), position)| points * position).sum()
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}
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fn part2(parsed: &Parsed) -> usize {
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unimplemented!()
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fn part2(hands: &Parsed) -> usize {
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let mut rated_hands = hands
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.iter()
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.cloned()
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.map(|(mut hand, points)| {
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let tiebreak = tiebreaker(&hand, &CARDS_P2);
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// Count how many jokers there are and insert nonsense data for them so they can’t produce any pairs.
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let mut jokers = 0;
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for c in hand.iter_mut().filter(|c| c == &&b'J') {
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*c = jokers;
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jokers += 1;
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}
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let mut rating = rate_hand(hand);
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for _ in 0..jokers {
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rating = rating.upgrade();
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}
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(rating as usize + tiebreak, points)
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})
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.collect_vec();
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rated_hands.sort_unstable_by_key(|(v, _)| *v);
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rated_hands.into_iter().zip(1..).map(|((_, points), position)| points * position).sum()
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}
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boilerplate! {
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@ -61,9 +111,9 @@ KTJJT 220
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QQQJA 483",
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tests: {
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part1: { TEST_INPUT => 6440 },
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part2: { TEST_INPUT => 0 },
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part2: { TEST_INPUT => 5905 },
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},
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bench1 == 248812215,
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bench2 == 0,
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bench2 == 250057090,
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bench_parse: Vec::len => 1000,
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}
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