diff --git a/Cargo.lock b/Cargo.lock index c92b01c..62948af 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -66,6 +66,13 @@ version = "0.1.0" name = "aoc_7" version = "0.1.0" +[[package]] +name = "aoc_8" +version = "0.1.0" +dependencies = [ + "take-until", +] + [[package]] name = "atty" version = "0.2.14" @@ -509,6 +516,12 @@ dependencies = [ "unicode-ident", ] +[[package]] +name = "take-until" +version = "0.1.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "b4e17d8598067a8c134af59cd33c1c263470e089924a11ab61cf61690919fe3b" + [[package]] name = "textwrap" version = "0.16.0" diff --git a/Cargo.toml b/Cargo.toml index 1db14bc..dfe8edb 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -12,11 +12,12 @@ members = [ "aoc_4", "aoc_5", "aoc_6", - "aoc_7" + "aoc_7", + "aoc_8" ] [workspace.dependencies] anyhow = "1" criterion = "0.4.0" -itertools = "0.10" \ No newline at end of file +itertools = "0.10" diff --git a/aoc_8/Cargo.toml b/aoc_8/Cargo.toml new file mode 100644 index 0000000..c78f231 --- /dev/null +++ b/aoc_8/Cargo.toml @@ -0,0 +1,15 @@ +[package] +name = "aoc_8" +version = "0.1.0" +edition = "2021" + +[[bin]] +name = "aoc_8" +path = "src/main.rs" + +[lib] +name = "aoc_8" +path = "src/lib.rs" + +[dependencies] +take-until = "0.1.0" # Needed, waiting for https://github.com/rust-lang/rust/issues/62208 \ No newline at end of file diff --git a/aoc_8/input.txt b/aoc_8/input.txt new file mode 100644 index 0000000..36eceda --- /dev/null +++ b/aoc_8/input.txt @@ -0,0 +1,99 @@ +222111121311033010320131232031301000043332012154435114414332231343214412243233401310320330011110110 +122212201111221321022211311332344223042233341324332523523451325341142120141122414312310331033122112 +012111111333222132312234104304231313255134131242541455235523145232422021413232302323121320032011100 +211112120020203103314110410023234421314251333452341121341453515343444003001233422242223302311322200 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Clone)] +struct Tree { + pub x: usize, + pub y: usize, + pub value: u32, +} + +impl Debug for Tree { + fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { + write!(f, "{}:{}[{}]", self.x, self.y, self.value) + } +} + +impl PartialOrd for Tree { + fn partial_cmp(&self, other: &Self) -> Option { + Some(self.cmp(other)) + } +} + +impl Ord for Tree { + fn cmp(&self, other: &Self) -> Ordering { + self.value.cmp(&other.value) + } +} + +pub fn part1(input_path: &str) -> Option { + let patch = parse_input(input_path)?; + let width = patch[0].len() - 1; + let height = patch.len() - 1; + let mut visibles = (width + height) * 2; + + for x_tree in 1..patch[0].len() - 1 { + for y_tree in 1..patch.len() - 1 { + let current_tree = &patch[x_tree][y_tree]; + + // Get the line of the current tree + let line = &patch[x_tree]; + // Get the column of the current tree + let col = &patch + .iter() + .map(|value| &value[y_tree]) + .collect::>(); + + /* Split the line and column on the current tree */ + let mut split_line = line.split(|other_tree| other_tree == current_tree); + let mut split_column = col.split(|other_tree| other_tree == ¤t_tree); + + /* For each side, we retrieve the optional max height of all the tree */ + let left = split_line.next()?.iter().max(); + let right = split_line.next()?.iter().max(); + let top = split_column.next()?.iter().max(); + let bottom = split_column.next()?.iter().max(); + + // If there is a taller tree of all 4 sides, then the tree is NOT visible, else, well, + // it is. + match (right, left, top, bottom) { + (Some(r), Some(l), Some(t), Some(b)) + if r >= current_tree + && l >= current_tree + && t >= ¤t_tree + && b >= ¤t_tree => {} + _ => { + visibles += 1; + } + } + } + } + Some(visibles as u32) +} + +pub fn part2(input_path: &str) -> Option { + let patch = parse_input(input_path)?; + let mut scenic_scores = 0; + for x_tree in 1..patch[0].len() - 1 { + for y_tree in 1..patch.len() - 1 { + let current_tree = &patch[x_tree][y_tree]; + + // Get the line of the current tree + let line = &patch[x_tree]; + // Get the column of the current tree + let col = &patch + .iter() + .map(|value| &value[y_tree]) + .collect::>(); + + /* Split the line and column on the current tree */ + let mut split_line = line.split(|other_tree| other_tree == current_tree); + let mut split_column = col.split(|other_tree| other_tree == ¤t_tree); + + // For each side, count the number of tree until we encounter a higher tree + let left = split_line + .next()? + .iter() + .rev() // Trees are on the left, we need to read the list from right to left + .take_until(|x| current_tree <= x) + .count(); + let right = split_line + .next()? + .iter() + .take_until(|x| current_tree <= x) + .count(); + let top = split_column + .next()? + .iter() + .rev() // Trees are on the top, we need to read the list from bottom to top + .take_until(|x| current_tree <= x) + .count(); + let bottom = split_column + .next()? + .iter() + .take_until(|x| current_tree <= x) + .count(); + + scenic_scores = scenic_scores.max(right * left * top * bottom); + } + } + Some(scenic_scores) +} + +fn parse_input(input_path: &str) -> Option>> { + let mut patch: Vec> = vec![]; + + std::fs::read_to_string(input_path) + .ok()? + .lines() + .enumerate() + .for_each(|(index_x, line)| { + patch.push( + line.split_whitespace() + .flat_map(|line| line.chars().enumerate()) + .filter_map(|(index_y, value)| { + let value = value.to_digit(10)?; + Some(Tree { + x: index_x, + y: index_y, + value, + }) + }) + .collect(), + ); + }); + Some(patch) +} + +#[cfg(test)] +mod tests { + use crate::{part1, part2}; + + #[test] + pub fn test_part1() { + assert_eq!(part1("input_test.txt"), Some(21)) + } + + #[test] + pub fn test_part2() { + assert_eq!(part2("input_test.txt"), Some(8)) + } +} diff --git a/aoc_8/src/main.rs b/aoc_8/src/main.rs new file mode 100644 index 0000000..84f4950 --- /dev/null +++ b/aoc_8/src/main.rs @@ -0,0 +1,11 @@ +use aoc_8::{part1, part2}; + +fn main() { + if let Some(x) = part1("input.txt") { + println!("Result part 1: {x}"); + } + + if let Some(x) = part2("input.txt") { + println!("Result part 2: {x}"); + } +}