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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| #![feature(test)] | ||
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| use std::cmp::Ordering; | ||
|
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| use itertools::Itertools; | ||
| use rustc_hash::FxHashSet; | ||
|
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| struct Input { | ||
| rules: FxHashSet<Rule>, | ||
| updates: Vec<Vec<Page>>, | ||
| } | ||
|
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| type Rule = (Page, Page); | ||
| type Page = i32; | ||
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| fn setup(input: &str) -> Input { | ||
| let mut blocks = input.trim().split("\n\n"); | ||
| let rules = blocks | ||
| .next() | ||
| .unwrap() | ||
| .lines() | ||
| .map(|line| { | ||
| line.split('|') | ||
| .map(|x| x.parse().unwrap()) | ||
| .collect_tuple() | ||
| .unwrap() | ||
| }) | ||
| .collect(); | ||
| let updates = blocks | ||
| .next() | ||
| .unwrap() | ||
| .lines() | ||
| .map(|line| line.split(',').map(|x| x.parse().unwrap()).collect()) | ||
| .collect(); | ||
| Input { rules, updates } | ||
| } | ||
|
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| fn make_sort_cmp(rules: &FxHashSet<Rule>) -> impl (Fn(&Page, &Page) -> Ordering) + Copy + use<'_> { | ||
| |&a, &b| match () { | ||
| _ if rules.contains(&(a, b)) => Ordering::Less, | ||
| _ if rules.contains(&(b, a)) => Ordering::Greater, | ||
| _ => Ordering::Equal, | ||
| } | ||
| } | ||
|
|
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| fn part1(input: &Input) -> Page { | ||
| let cmp = make_sort_cmp(&input.rules); | ||
| input | ||
| .updates | ||
| .iter() | ||
| .filter(|&u| u.is_sorted_by(|a, b| cmp(a, b).is_le())) | ||
| .map(|u| u[u.len() >> 1]) | ||
| .sum() | ||
| } | ||
|
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| fn part2(input: &Input) -> Page { | ||
| let cmp = make_sort_cmp(&input.rules); | ||
| input | ||
| .updates | ||
| .iter() | ||
| .filter(|&u| !u.is_sorted_by(|a, b| cmp(a, b).is_le())) | ||
| .cloned() | ||
| .map(|mut u| { | ||
| let n = u.len() >> 1; | ||
| *u.select_nth_unstable_by(n, cmp).1 | ||
| }) | ||
| .sum() | ||
| } | ||
|
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| aoc::main!(2024, 5, ex: 1); |
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@@ -3,7 +3,7 @@ aoc::year! { | |
| "02.rs", | ||
| "03.rs", | ||
| "04.rs", | ||
| // "05.rs", | ||
| "05.rs", | ||
| // "06.rs", | ||
| // "07.rs", | ||
| // "08.rs", | ||
|
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||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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|
@@ -372,3 +372,6 @@ path = "2024/03.rs" | |
| [[bin]] | ||
| name = "2024_04" | ||
| path = "2024/04.rs" | ||
| [[bin]] | ||
| name = "2024_05" | ||
| path = "2024/05.rs" | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| 47|53 | ||
| 97|13 | ||
| 97|61 | ||
| 97|47 | ||
| 75|29 | ||
| 61|13 | ||
| 75|53 | ||
| 29|13 | ||
| 97|29 | ||
| 53|29 | ||
| 61|53 | ||
| 97|53 | ||
| 61|29 | ||
| 47|13 | ||
| 75|47 | ||
| 97|75 | ||
| 47|61 | ||
| 75|61 | ||
| 47|29 | ||
| 75|13 | ||
| 53|13 | ||
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| 75,47,61,53,29 | ||
| 97,61,53,29,13 | ||
| 75,29,13 | ||
| 75,97,47,61,53 | ||
| 61,13,29 | ||
| 97,13,75,29,47 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| 143 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| 123 |