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Mathis merged 6 commits from restructuring into main 2023-12-18 21:49:46 +00:00
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src/2023/03-gear-ratios/input.txt
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src/2023/03-gear-ratios/input_test.txt
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src/2023/03-gear-ratios/part_one.rs Normal file
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use std::fs::File;
use std::io::{self, BufRead};
use std::path::Path;
enum Engine {
Symbol(char),
Number(u32),
Empty,
}
pub fn part_one() {
if let Ok(lines) = read_lines("./input.txt") {
let matrix = create_matrix(lines);
let result = process_matrix(&matrix);
println!("{}", result);
}
}
fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
where
P: AsRef<Path>,
{
let file = File::open(filename)?;
Ok(io::BufReader::new(file).lines())
}
fn create_matrix(lines: io::Lines<io::BufReader<File>>) -> Vec<Vec<Engine>> {
let mut matrix: Vec<Vec<Engine>> = Vec::new();
for (i, line) in lines.enumerate() {
matrix.push(Vec::new());
let line = line.unwrap();
for ch in line.chars() {
if ch == '.' {
matrix[i].push(Engine::Empty);
} else if ch.is_digit(10) {
matrix[i].push(Engine::Number(ch.to_digit(10).unwrap()));
} else {
matrix[i].push(Engine::Symbol(ch));
}
}
}
return matrix;
}
fn process_matrix(matrix: &Vec<Vec<Engine>>) -> u32 {
let mut result = 0;
for i in 0..matrix.len() {
let mut is_num = false;
let mut num = 0;
let mut found_symbol = false;
for j in 0..matrix[i].len() {
match matrix[i][j] {
Engine::Number(value) => {
if !found_symbol {
found_symbol = check_symbol(&matrix, i, j);
}
if is_num {
num = num * 10 + value;
} else {
num = value;
}
is_num = true;
}
_ => {
if is_num && found_symbol {
result += num;
}
is_num = false;
found_symbol = false;
num = 0;
}
}
}
if is_num && found_symbol {
result += num;
}
}
return result;
}
fn check_symbol(matrix: &Vec<Vec<Engine>>, x: usize, y: usize) -> bool {
// There's probably a better way
if x > 0 {
if let Engine::Symbol(_) = matrix[x - 1][y] {
return true;
}
if y > 0 {
if let Engine::Symbol(_) = matrix[x - 1][y - 1] {
return true;
}
}
if y < matrix[x - 1].len() - 1 {
if let Engine::Symbol(_) = matrix[x - 1][y + 1] {
return true;
}
}
}
if y > 0 {
if let Engine::Symbol(_) = matrix[x][y - 1] {
return true;
}
}
if y < matrix[x].len() - 1 {
if let Engine::Symbol(_) = matrix[x][y + 1] {
return true;
}
}
if x < matrix.len() - 1 {
if let Engine::Symbol(_) = matrix[x + 1][y] {
return true;
}
if y > 0 {
if let Engine::Symbol(_) = matrix[x + 1][y - 1] {
return true;
}
}
if y < matrix[x + 1].len() - 1 {
if let Engine::Symbol(_) = matrix[x + 1][y + 1] {
return true;
}
}
}
return false;
}