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+........................153.........-........@.....*...661..*833......*.775.....-...........................40....665...............701..... +..890....252......................544........809..425..............925...................................................................... diff --git a/src/aoc2023/day03/mod.rs b/src/aoc2023/day03/mod.rs new file mode 100644 index 0000000..a2ce1e7 --- /dev/null +++ b/src/aoc2023/day03/mod.rs @@ -0,0 +1,203 @@ +const ROW_WIDTH: usize = 140; +const AMOUNT_OF_COLS: usize = 140; +// sed 's/./&\n/g' | LC_COLLATE=C sort -u | tr -d '\n' provides #$%&*+-./0123456789=@ +const SYMBOLS: &[char; 10] = &['#', '$', '%', '&', '*', '+', '-', '/', '=', '@']; +const SYMBOLS_WITH_DOT: &[char; 11] = &['#', '$', '%', '&', '*', '+', '-', '/', '=', '@', '.']; + +pub fn task_one(input: &str) -> String { + let lines: Vec<&str> = input.lines().collect(); + + let mut list_of_numbers = parse_input_into_number_list(&input); + + for number in list_of_numbers.iter_mut() { + for coord in number.get_interesting_coords() { + let line = lines[coord.1]; + + if SYMBOLS.contains(&line.chars().nth(coord.0).unwrap()) { + number.should_be_used = true; + break; + } + } + } + + list_of_numbers.iter() + .filter(|x| x.should_be_used) + .fold(0, |sum, x | sum + x.value ) + .to_string() +} + +pub fn task_two(input: &str) -> String { + let numbers = parse_input_into_number_list(&input); + let lines: Vec<&str> = input.lines().collect(); + + let mut sum = 0; + + for y in 0..ROW_WIDTH { + let line = lines.get(y).unwrap(); + + for x in 0..AMOUNT_OF_COLS { + if line.chars().nth(x).unwrap() == '*' { + let star = PartNumber { value: 1, x, y, should_be_used: false }; + let area = star.get_interesting_coords(); + + let gear_numbers: Vec = numbers.iter() + .filter(|num| num.get_x_positions().iter().any(|x| area.contains(&(*x, num.y)))) + .map(|num| num.value).collect(); + + if gear_numbers.len() == 2 { + sum += gear_numbers[0] * gear_numbers[1]; + } + } + } + } + + sum.to_string() +} + +#[derive(Debug)] +struct PartNumber { + value: usize, + x: usize, + y: usize, + should_be_used: bool +} + +impl PartNumber { + pub fn width(&self) -> usize { + (self.value.checked_ilog10().unwrap_or(0) + 1) as usize + } + + pub fn get_interesting_coords(&self) -> Vec<(usize, usize)> { + let mut coords = Vec::new(); + + // row over + if let Some(row_over) = self.y.checked_sub(1) { + for d in 0..(self.width() + 2) { + if let Some(x) = (self.x + d).checked_sub(1) { + if x < ROW_WIDTH { + coords.push((x, row_over)); + } + } + } + } + + // left + if let Some(col_left) = self.x.checked_sub(1) { + coords.push((col_left, self.y)) + } + + // right + let col_right = self.x + self.width(); + if col_right < ROW_WIDTH { + coords.push((col_right, self.y)) + } + + // row below + let row_below = self.y + 1; + if row_below < AMOUNT_OF_COLS { + for d in 0..(self.width() + 2) { + if let Some(x) = (self.x + d).checked_sub(1) { + if x < ROW_WIDTH { + coords.push((x, row_below)); + } + } + } + } + + coords + } + + pub fn get_x_positions(&self) -> Vec { + let mut positions = Vec::new(); + + for d in 0..(self.width()) { + positions.push(self.x + d); + } + + positions + } +} + +fn parse_input_into_number_list(input: &str) -> Vec { + let mut list = Vec::new(); + let mut y = 0; + + for line in input.lines() { + let mut local_line = line.to_string(); + + for element in line.split_terminator(SYMBOLS_WITH_DOT) { + let x: &[_] = SYMBOLS; + let element = element.trim_matches(x); + + if let Ok(number) = element.parse::() { + let x = local_line.find(&number.to_string()).unwrap(); + let partnumber = PartNumber { value: number, x, y, should_be_used: false }; + + let mut add_string = String::new(); + for _ in 0..(partnumber.x + partnumber.width()) { + add_string.push('.'); + } + + local_line.replace_range(..(partnumber.x + partnumber.width()), &add_string); + + list.push(partnumber) + } + } + y += 1; + } + + list +} + +#[test] +fn test_width() { + let number_one = PartNumber {value: 9, x: 1, y: 1, should_be_used: false}; + let number_two = PartNumber {value: 20, x: 1, y: 1, should_be_used: false}; + let number_three = PartNumber {value: 800, x: 1, y: 1, should_be_used: false}; + let number_four = PartNumber {value: 8000, x: 1, y: 1, should_be_used: false}; + + assert_eq!(number_one.width(), 1); + assert_eq!(number_two.width(), 2); + assert_eq!(number_three.width(), 3); + assert_eq!(number_four.width(), 4); +} + +#[test] +fn test_interesting_coords() { + let number_one = PartNumber { value: 100, x: 1, y:1, should_be_used: false}; + let number_on_right = PartNumber { value: 100, x: 137, y:1, should_be_used: false}; + let number_on_left = PartNumber { value: 100, x: 0, y:1, should_be_used: false}; + let number_on_top = PartNumber { value: 100, x: 1, y:0, should_be_used: false}; + let number_on_bottom = PartNumber { value: 100, x: 1, y:139, should_be_used: false}; + + assert_eq!(number_one.get_interesting_coords(), + vec![(0,0), (1,0), (2,0), (3,0), (4,0), (0,1), (4, 1), (0, 2), (1, 2), (2, 2), (3, 2), (4, 2)]); + + assert_eq!(number_on_right.get_interesting_coords(), + vec![(136,0), (137,0), (138,0), (139,0), (136,1), (136, 2), (137, 2), (138, 2), (139, 2)]); + + assert_eq!(number_on_left.get_interesting_coords(), + vec![(0,0), (1,0), (2,0), (3,0), (3, 1), (0, 2), (1, 2), (2, 2), (3, 2)]); + + assert_eq!(number_on_top.get_interesting_coords(), + vec![(0,0), (4, 0), (0, 1), (1, 1), (2, 1), (3, 1), (4, 1)]); + + assert_eq!(number_on_bottom.get_interesting_coords(), + vec![(0,138), (1,138), (2,138), (3,138), (4,138), (0,139), (4, 139)]); +} + +#[test] +fn test_task_one() { + let input = r#"467..114.. +...*...... +..35..633. +......#... +617*...... +.....+.58. +..592..... +......755. +...$.*.... +.664.598.."#; + + assert_eq!(task_one(input), "4361"); +} diff --git a/src/aoc2023/mod.rs b/src/aoc2023/mod.rs index 28326d5..89345b1 100644 --- a/src/aoc2023/mod.rs +++ b/src/aoc2023/mod.rs @@ -1,2 +1,3 @@ pub mod day01; pub mod day02; +pub mod day03; diff --git a/src/main.rs b/src/main.rs index f67c548..eb701a9 100644 --- a/src/main.rs +++ b/src/main.rs @@ -47,6 +47,7 @@ fn main() { // AOC 2023 puzzles.push(Puzzle { day: 1, year: 2023, task_one: aoc2023::day01::task_one, task_two: aoc2023::day01::task_two }); puzzles.push(Puzzle { day: 2, year: 2023, task_one: aoc2023::day02::task_one, task_two: aoc2023::day02::task_two }); + puzzles.push(Puzzle { day: 3, year: 2023, task_one: aoc2023::day03::task_one, task_two: aoc2023::day03::task_two }); puzzles.iter().for_each(|puzzle| puzzle.solve_and_print()); }