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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| #![feature(test)] | ||
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| use std::{ | ||
| cmp::Reverse, | ||
| collections::{BinaryHeap, VecDeque}, | ||
| }; | ||
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| type Input = Vec<u8>; | ||
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| fn setup(input: &str) -> Input { | ||
| input.trim().bytes().map(|b| b - b'0').collect() | ||
| } | ||
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| fn part1(input: &Input) -> u64 { | ||
| let mut files = Vec::new(); | ||
| let mut free = VecDeque::new(); | ||
| let mut pos = 0; | ||
| for (i, len) in input.iter().map(|&x| x as u64).enumerate() { | ||
| if i & 1 == 0 { | ||
| files.push((pos, len, i as u64 >> 1)); | ||
| } else if len > 0 { | ||
| free.push_back((pos, len)); | ||
| } | ||
| pos += len; | ||
| } | ||
|
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| files | ||
| .iter() | ||
| .flat_map(|&(file_pos, file_len, file_id)| { | ||
| (file_pos..file_pos + file_len).map(move |pos| (pos, file_id)) | ||
| }) | ||
| .rev() | ||
| .map(|(mut pos, file_id)| { | ||
| if let Some((free_pos, free_len)) = free.front_mut().filter(|free| free.0 < pos) { | ||
| pos = *free_pos; | ||
| *free_pos += 1; | ||
| *free_len -= 1; | ||
| if *free_len == 0 { | ||
| free.pop_front(); | ||
| } | ||
| } | ||
| pos * file_id | ||
| }) | ||
| .sum() | ||
| } | ||
|
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| fn part2(input: &Input) -> u64 { | ||
| let mut files = Vec::new(); | ||
| let mut free_by_len = [const { BinaryHeap::new() }; 10]; | ||
| let mut pos = 0; | ||
| for (i, len) in input.iter().map(|&x| x as u64).enumerate() { | ||
| if i & 1 == 0 { | ||
| files.push((pos, len, i as u64 >> 1)); | ||
| } else if len > 0 { | ||
| free_by_len[len as usize].push(Reverse(pos)); | ||
| } | ||
| pos += len; | ||
| } | ||
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| files | ||
| .iter() | ||
| .rev() | ||
| .map(|&(file_pos, file_len, file_id)| { | ||
| let pos = (file_len as _..free_by_len.len()) | ||
| .filter_map(|len| free_by_len[len].peek().map(|&free_pos| (free_pos.0, len))) | ||
| .min() | ||
| .filter(|&(free_pos, _)| free_pos < file_pos) | ||
| .map(|(free_pos, free_len)| { | ||
| free_by_len[free_len].pop(); | ||
| if free_len > file_len as usize { | ||
| free_by_len[free_len - file_len as usize] | ||
| .push(Reverse(free_pos + file_len)); | ||
| } | ||
| free_pos | ||
| }) | ||
| .unwrap_or(file_pos); | ||
| file_len * (pos * 2 + file_len - 1) / 2 * file_id | ||
| }) | ||
| .sum() | ||
| } | ||
|
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| aoc::main!(2024, 9, ex: 1); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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|
@@ -7,7 +7,7 @@ aoc::year! { | |
| "06.rs", | ||
| "07.rs", | ||
| "08.rs", | ||
| // "09.rs", | ||
| "09.rs", | ||
| // "10.rs", | ||
| // "11.rs", | ||
| // "12.rs", | ||
|
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||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -384,3 +384,6 @@ path = "2024/07.rs" | |
| [[bin]] | ||
| name = "2024_08" | ||
| path = "2024/08.rs" | ||
| [[bin]] | ||
| name = "2024_09" | ||
| path = "2024/09.rs" | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| 2333133121414131402 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| 1928 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| 2858 |