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[TASK] Day 3

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This commit is contained in:
Bas Dado
2023-12-03 13:20:49 +01:00
parent 13263f6f05
commit fa48e8877a
5 changed files with 296 additions and 2 deletions
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.........798...145.........629....579.....455.....................130.............243.................154........167........................
............*.....*...........*...&...179.*........737...194.........*854........./...........52..560*............................699...&...
........459..489.817........880.........*..996........*....*........................................................................*.36....
...........@.........................813............234.552..307....184............370..................736.....960..............631........
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....................109........................559.....835.....708........989..685................................#.............=.915.......
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..........427............$.......................................75..............789...942........-......*.........795......*.......73......
....863................%.......920..........*152.....852*387.........990.....563..*.....*...629........772....912............283............
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...........38+..............937...................142.........*712........$.....619..*734............424..................=.................
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.....570...........353*674........#....636........659..............647.....226..*.......+......684...............139...290..401........290..
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..........$......910...........195..952..320.........*......832.................*...296.............*..860..401.........%....157/...........
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........171..............=........#..*...............407...%.......................331..915..............................919................
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.....646....*......76....................%..50.......................*.......541.......782.....752+....*......296*.......523...@......881...
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.....353............................914........105.................829...........112...............75.......................................

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input/day03_example.txt Normal file
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@@ -0,0 +1,10 @@
467..114..
...*......
..35..633.
......#...
617*......
.....+.58.
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...$.*....
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src/day3.rs Normal file
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@@ -0,0 +1,139 @@
use std::collections::HashSet;
use crate::day_solver::DaySolver;
use crate::util::Coord;
use super::util;
#[derive(Debug)]
pub struct Day3 {
numbers: Vec<(Coord<usize>, u32)>,
symbols: HashSet<Coord<usize>>,
gears: Vec<Coord<usize>>
}
impl Day3 {
pub fn create(input_filename: String) -> Self {
let lines = util::read_file(&input_filename);
// let lines = util::read_file("input/dayX.txt");
let mut numbers = Vec::new();
let mut symbols = HashSet::new();
let mut gears = Vec::new();
for (y, line) in lines.iter().enumerate() {
let mut cur_num= Vec::new();
for (x, c) in line.char_indices() {
if c.is_numeric() {
cur_num.push(c)
} else {
if !cur_num.is_empty() {
numbers.push((
Coord::new(x - cur_num.len(), y),
cur_num.to_owned().into_iter().collect::<String>().parse::<u32>().unwrap()
));
cur_num.clear();
}
if c != '.' {
// A symbol!
symbols.insert(Coord::new(x, y));
}
if c == '*' {
gears.push(Coord::new(x, y));
}
}
}
// If the line ends with a number, we still need to process it...
if !cur_num.is_empty() {
numbers.push((
Coord::new(line.len() - cur_num.len(), y),
cur_num.to_owned().into_iter().collect::<String>().parse::<u32>().unwrap()
));
cur_num.clear();
}
}
// Put the input into the day struct
return Day3 {
numbers,
symbols,
gears
}
}
fn has_adjacent_symbol(&self, pos: &Coord<usize>, n: &u32) -> bool {
let n_len = Self::number_length(n);
for y in pos.y.checked_sub(1).unwrap_or(0)..pos.y + 2 {
for x in pos.x.checked_sub(1).unwrap_or(0)..pos.x + n_len + 1 {
if self.symbols.contains(&Coord::new(x, y)) {
return true
}
}
}
return false
}
fn get_adjacent_numbers(&self, pos: &Coord<usize>) -> Vec<u32> {
return self.numbers.iter()
.filter(|cn| self.is_adjacent(&pos, cn))
.map(|(_, n)| n.to_owned())
.collect()
}
fn is_adjacent(&self, pos: &Coord<usize>, number: &(Coord<usize>, u32)) -> bool {
return pos.x >= number.0.x.checked_sub(1).unwrap_or(0) && pos.x <= number.0.x + Self::number_length(&number.1) &&
pos.y >= number.0.y.checked_sub(1).unwrap_or(0) && pos.y <= number.0.y + 1
}
fn number_length(n: &u32) -> usize {
n.to_string().len()
}
}
impl DaySolver for Day3 {
fn solve_part1(&mut self) -> String {
// println!("{:?}", self);
let mut sum = 0u32;
for (pos, n) in &self.numbers {
if self.has_adjacent_symbol(&pos, n) {
sum += n;
// } else {
// println!("No adjacent symbol for {}", n);
}
}
sum.to_string()
}
fn solve_part2(&mut self) -> String {
let mut sum = 0;
for gear in &self.gears {
let adjacent = self.get_adjacent_numbers(gear);
if adjacent.len() > 1 {
sum += adjacent.iter().product::<u32>();
}
}
sum.to_string()
}
}
#[test]
fn test_part1() {
let mut day3 = Day3::create("input/day03_example.txt".to_string());
assert_eq!("4361", day3.solve_part1());
}
#[test]
fn test_part2() {
let mut day3 = Day3::create("input/day03_example.txt".to_string());
assert_eq!("467835", day3.solve_part2());
}

7
src/main.rs
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@@ -3,14 +3,16 @@ extern crate core;
use std::time::Instant; use std::time::Instant;
use crate::day1::Day1; use crate::day1::Day1;
use crate::day2::Day2; use crate::day2::Day2;
use crate::day3::Day3;
use crate::day_solver::DaySolver; use crate::day_solver::DaySolver;
mod util; mod util;
mod day1; mod day1;
mod day2; mod day2;
mod day3;
mod day_solver; mod day_solver;
const MAX_DAY: u8 = 2; const MAX_DAY: u8 = 3;
const DEFAULT_BENCHMARK_AMOUNT: u32 = 100; const DEFAULT_BENCHMARK_AMOUNT: u32 = 100;
fn main() { fn main() {
@@ -73,9 +75,12 @@ struct AocBenchResult {
} }
fn build_day_solver(day: u8) -> Option<Box<dyn DaySolver>> { fn build_day_solver(day: u8) -> Option<Box<dyn DaySolver>> {
let input_filename = format!("input/day{:02}.txt",day);
match day { match day {
1 => Some(Box::new(Day1::create())), 1 => Some(Box::new(Day1::create())),
2 => Some(Box::new(Day2::create())), 2 => Some(Box::new(Day2::create())),
3 => Some(Box::new(Day3::create(input_filename))),
_ => None _ => None
} }
} }

2
src/util.rs
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@@ -81,7 +81,7 @@ impl <T: Display + Clone + Sized> Grid<T> {
} }
} }
#[derive(Debug, Clone, Copy, PartialEq, Eq)] #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct Coord<T> where T: Sized { pub struct Coord<T> where T: Sized {
pub x: T, pub x: T,
pub y: T pub y: T