Rust Day 3 Part 1

This commit is contained in:
Tobias Berger 2023-12-03 10:43:10 +01:00
parent 1e5159e781
commit 01ba0f9ffb
Signed by: toby
GPG key ID: 2D05EFAB764D6A88
7 changed files with 263 additions and 3 deletions

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rust/Cargo.lock generated
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@ -4,4 +4,4 @@ version = 3
[[package]]
name = "advent-of-code"
version = "23.2.2"
version = "23.3.1"

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@ -1,8 +1,8 @@
[package]
name = "advent-of-code"
version = "23.2.2"
version = "23.3.1"
edition = "2021"
default-run = "day02"
default-run = "day03"
[profile.release]
strip = "symbols"
@ -32,3 +32,7 @@ path = "src/day01/main.rs"
[[bin]]
name = "day02"
path = "src/day02/main.rs"
[[bin]]
name = "day03"
path = "src/day03/main.rs"

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rust/src/day03/main.rs Normal file
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const INPUT: &str = include_str!("input.txt");
mod part_1;
use part_1::part_1;
mod part_2;
use part_2::part_2;
fn main() {
println!("{}", part_1(INPUT));
println!("{}", part_2(INPUT));
}

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rust/src/day03/part_1.rs Normal file
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use std::iter::Sum;
#[derive(Debug)]
struct PartNumber(u64);
impl<'a> Sum<&'a PartNumber> for u64 {
fn sum<I: Iterator<Item = &'a PartNumber>>(iter: I) -> Self {
iter.fold(0, |acc, x| acc + x.0)
}
}
pub(crate) fn part_1(input: &'static str) -> u64 {
let mut part_numbers = vec![];
for (y, line) in input.lines().enumerate() {
let mut search_index = 0;
loop {
let search_line = &line[search_index..];
if search_line.is_empty() {
break;
}
let Some(number_start) = search_line.find(|c| char::is_ascii_digit(&c)) else {
break;
};
let number_end = search_line[number_start..]
.find(|c| !char::is_ascii_digit(&c))
.unwrap_or(search_line.len() - number_start)
+ number_start;
let number = search_line[number_start..number_end]
.parse()
.expect("Should be a valid number");
// This `line.len()` assumes the input is square
let mut has_symbol_neighbor = false;
'symbol_search_loop: for y in y.saturating_sub(1)..=usize::min(y + 1, line.len() - 1) {
for x in (search_index + number_start).saturating_sub(1)
..=usize::min(search_index + number_end, line.len())
{
let idx = y * (line.len() + 1) + x;
let char = input.as_bytes()[idx] as char;
if !matches!(char, '0'..='9' | '.' | '\n') {
has_symbol_neighbor = true;
break 'symbol_search_loop;
}
}
}
if has_symbol_neighbor {
part_numbers.push(PartNumber(number));
}
search_index += number_end;
}
}
part_numbers.iter().sum()
}
#[cfg(test)]
mod tests {
const SAMPLE_INPUT: &str = include_str!("sample_input.txt");
#[test]
fn test_with_sample_solution() {
assert_eq!(super::part_1(SAMPLE_INPUT), 4361)
}
#[test]
fn test_with_solution() {
assert_eq!(super::part_1(crate::INPUT), 539590);
}
}

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rust/src/day03/part_2.rs Normal file
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pub(crate) fn part_2(_input: &'static str) -> u64 {
todo!("Part 2")
}
#[cfg(test)]
mod tests {
const SAMPLE_INPUT: &str = include_str!("sample_input.txt");
#[test]
fn test_with_sample_solution() {
assert_eq!(
super::part_2(SAMPLE_INPUT),
todo!("Add result from example part 2")
);
}
#[test]
fn test_with_solution() {
assert_eq!(
super::part_2(crate::INPUT),
todo!("Add result for solved part 2")
);
}
}

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