Add day 8
This commit is contained in:
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commit
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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version = 3
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[[package]]
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name = "common"
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version = "0.1.0"
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[[package]]
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name = "day8"
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version = "0.1.0"
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dependencies = [
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"common",
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]
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[package]
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name = "day8"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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common = { path = "../common" }
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@ -0,0 +1,324 @@
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fn main() {
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println!("Hello, world!");
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let input_file = common::parse_args_input_file(&mut std::env::args());
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let contents = std::fs::read_to_string(input_file).expect("Failed to read input file");
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let mut map = Map::from_string(&contents);
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map.calculate_visibility();
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let mut visible = 0;
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for p in map.data.iter() {
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if p.visible.is_some() && p.visible.unwrap() {
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visible += 1;
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}
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}
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println!("[PART 1] {} visible trees", visible);
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map.calculate_scores();
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let mut high_score = 0;
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let mut high_score_index = 0;
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for (index, point) in map.data.iter().enumerate() {
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assert!(point.score.is_some());
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if point.score.unwrap() > high_score {
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high_score = point.score.unwrap();
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high_score_index = index;
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}
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}
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println!("[PART 2] Highest scenic score at index {}: {}", high_score_index, high_score);
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}
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struct Point {
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height: u32,
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visible: Option<bool>,
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score: Option<u32>,
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}
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struct Map {
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width: u32,
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height: u32,
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data: std::vec::Vec<Point>,
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}
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impl Map {
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fn from_string(s: &String) -> Map {
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let mut h: u32 = 0;
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let mut map = Map {
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width: 0,
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height: 0,
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data: std::vec::Vec::<Point>::new(),
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};
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for line in s.lines() {
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if line.eq("") {
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continue;
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}
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if map.width == 0 {
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map.width = u32::try_from(line.len()).unwrap();
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}
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else {
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assert_eq!(map.width, u32::try_from(line.len()).unwrap());
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}
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h += 1;
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for c in line.chars() {
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map.data.push(Point {
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// this converts the character code to u32, so assume it's 0-9
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// and substract the ascii code index
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height: u32::from(c) - 48,
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visible: None,
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score: None,
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});
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}
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}
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map.height = h;
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return map;
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}
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fn point_index(&self, x: u32, y: u32) -> usize {
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return Map::point_index_s(x, y, self.width, self.height);
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}
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fn point_index_s(x: u32, y: u32, width: u32, height: u32) -> usize {
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assert!(x < width);
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assert!(y < height);
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return usize::try_from(y * width + x).unwrap();
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}
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fn index_to_point(&self, index: usize) -> (u32, u32) {
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return Map::index_to_point_s(index, self.height);
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}
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fn index_to_point_s(index: usize, height: u32) -> (u32, u32) {
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let x = u32::try_from(index).unwrap() % height;
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let y = u32::try_from(index).unwrap() / height;
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return (x, y);
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}
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fn is_edge_point(&self, x: u32, y: u32) -> bool {
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return (x == 0 || x == (self.width - 1)) || (y == 0 || y == (self.height - 1));
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}
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fn calculate_visibility(&mut self) {
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// Mark all edges as visible
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let mut x = 0;
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let mut y = 0;
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while x < self.width {
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let p1 = self.point_index(x, 0);
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let p2 = self.point_index(x, self.height - 1);
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self.data[p1].visible = Some(true);
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self.data[p2].visible = Some(true);
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x += 1;
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}
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while y < self.height {
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let p1 = self.point_index(0, y);
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let p2 = self.point_index(self.width - 1, y);
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self.data[p1].visible = Some(true);
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self.data[p2].visible = Some(true);
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y += 1;
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}
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let mut index = 0;
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while index < self.data.len() {
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if self.data[index].visible.is_some() {
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index += 1;
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continue;
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}
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let (x, y) = Map::index_to_point_s(index, self.height);
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let mut cur_x = x;
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let mut cur_y = y;
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// Look "up", negative y
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let mut vis_n = true;
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let mut vis_s = true;
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let mut vis_e = true;
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let mut vis_w = true;
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let mut last_height = self.data[index].height;
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while cur_y > 0 {
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cur_y -= 1;
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let p = Map::point_index_s(cur_x, cur_y, self.width, self.height);
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println!("[{}] Testing N point ({}, {})", index, cur_x, cur_y);
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if self.data[p].height >= last_height {
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vis_n = false;
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break;
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}
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last_height = std::cmp::max(last_height, self.data[p].height);
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}
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cur_y = y;
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last_height = self.data[index].height;
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while cur_y < self.height - 1 {
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cur_y += 1;
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let p = Map::point_index_s(cur_x, cur_y, self.width, self.height);
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println!("[{}] Testing S point ({}, {})", index, cur_x, cur_y);
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if self.data[p].height >= last_height {
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vis_s = false;
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break;
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}
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last_height = std::cmp::max(last_height, self.data[p].height);
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}
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cur_y = y;
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last_height = self.data[index].height;
|
||||
while cur_x > 0 {
|
||||
cur_x -= 1;
|
||||
let p = Map::point_index_s(cur_x, cur_y, self.width, self.height);
|
||||
println!("[{}] Testing W point ({}, {})", index, cur_x, cur_y);
|
||||
if self.data[p].height >= last_height {
|
||||
vis_w = false;
|
||||
break;
|
||||
}
|
||||
last_height = std::cmp::max(last_height, self.data[p].height);
|
||||
}
|
||||
cur_x = x;
|
||||
last_height = self.data[index].height;
|
||||
while cur_x < self.width -1 {
|
||||
cur_x += 1;
|
||||
let p = Map::point_index_s(cur_x, cur_y, self.width, self.height);
|
||||
println!("[{}] Testing E point ({}, {})", index, cur_x, cur_y);
|
||||
if self.data[p].height >= last_height {
|
||||
vis_e = false;
|
||||
break;
|
||||
}
|
||||
last_height = std::cmp::max(last_height, self.data[p].height);
|
||||
}
|
||||
if vis_n || vis_s || vis_e || vis_w {
|
||||
self.data[index].visible = Some(true);
|
||||
}
|
||||
else {
|
||||
self.data[index].visible = Some(false);
|
||||
}
|
||||
index += 1;
|
||||
}
|
||||
}
|
||||
|
||||
fn calculate_scores(&mut self) {
|
||||
let mut index = 0;
|
||||
while index < self.data.len() {
|
||||
if self.data[index].score.is_some() {
|
||||
index += 1;
|
||||
continue;
|
||||
}
|
||||
let (x, y) = Map::index_to_point_s(index, self.height);
|
||||
let mut cur_x = x;
|
||||
let mut cur_y = y;
|
||||
// Look "up", negative y
|
||||
let mut vis_n = 0;
|
||||
let mut vis_s = 0;
|
||||
let mut vis_e = 0;
|
||||
let mut vis_w = 0;
|
||||
let mut last_height = self.data[index].height;
|
||||
while cur_y > 0 {
|
||||
cur_y -= 1;
|
||||
let p = Map::point_index_s(cur_x, cur_y, self.width, self.height);
|
||||
println!("[{}] Testing N point ({}, {})", index, cur_x, cur_y);
|
||||
if self.data[p].height >= last_height {
|
||||
vis_n += 1;
|
||||
break;
|
||||
}
|
||||
last_height = std::cmp::max(last_height, self.data[p].height);
|
||||
vis_n += 1;
|
||||
}
|
||||
cur_y = y;
|
||||
last_height = self.data[index].height;
|
||||
while cur_y < self.height - 1 {
|
||||
cur_y += 1;
|
||||
let p = Map::point_index_s(cur_x, cur_y, self.width, self.height);
|
||||
println!("[{}] Testing S point ({}, {})", index, cur_x, cur_y);
|
||||
if self.data[p].height >= last_height {
|
||||
vis_s += 1;
|
||||
break;
|
||||
}
|
||||
vis_s += 1;
|
||||
last_height = std::cmp::max(last_height, self.data[p].height);
|
||||
}
|
||||
cur_y = y;
|
||||
last_height = self.data[index].height;
|
||||
while cur_x > 0 {
|
||||
cur_x -= 1;
|
||||
let p = Map::point_index_s(cur_x, cur_y, self.width, self.height);
|
||||
println!("[{}] Testing W point ({}, {})", index, cur_x, cur_y);
|
||||
if self.data[p].height >= last_height {
|
||||
vis_w += 1;
|
||||
break;
|
||||
}
|
||||
vis_w += 1;
|
||||
last_height = std::cmp::max(last_height, self.data[p].height);
|
||||
}
|
||||
cur_x = x;
|
||||
last_height = self.data[index].height;
|
||||
while cur_x < self.width -1 {
|
||||
cur_x += 1;
|
||||
let p = Map::point_index_s(cur_x, cur_y, self.width, self.height);
|
||||
println!("[{}] Testing E point ({}, {})", index, cur_x, cur_y);
|
||||
if self.data[p].height >= last_height {
|
||||
vis_e += 1;
|
||||
break;
|
||||
}
|
||||
vis_e += 1;
|
||||
last_height = std::cmp::max(last_height, self.data[p].height);
|
||||
}
|
||||
println!("[{}] {}N, {}S, {}E, {}W: score {}", index, vis_n, vis_s, vis_e, vis_w,
|
||||
vis_n * vis_s * vis_e * vis_w);
|
||||
self.data[index].score = Some(vis_n * vis_s * vis_e * vis_w);
|
||||
index += 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
#[test]
|
||||
fn point_index() {
|
||||
let map = Map {
|
||||
height: 5,
|
||||
width: 5,
|
||||
data: std::vec::Vec::<Point>::new(),
|
||||
};
|
||||
assert_eq!(map.point_index(0, 4), 20);
|
||||
assert_eq!(map.point_index(4, 0), 4);
|
||||
assert_eq!(map.point_index(2, 2), 12);
|
||||
assert_eq!(map.index_to_point(20), (0, 4));
|
||||
|
||||
assert_eq!(map.is_edge_point(2, 0), true);
|
||||
assert_eq!(map.is_edge_point(2, 2), false);
|
||||
assert_eq!(map.is_edge_point(2, 4), true);
|
||||
assert_eq!(map.is_edge_point(0, 2), true);
|
||||
assert_eq!(map.is_edge_point(4, 2), true);
|
||||
assert_eq!(map.is_edge_point(1, 1), false);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn example() {
|
||||
let mut map = Map::from_string(&std::fs::read_to_string("test_input").expect("Failed to read test_input file"));
|
||||
assert_eq!(map.width, 5);
|
||||
assert_eq!(map.height, 5);
|
||||
assert_eq!(map.data[0].height, 3);
|
||||
|
||||
let mut invisible_points = std::vec::Vec::<usize>::new();
|
||||
let mut visible_count = 0;
|
||||
map.calculate_visibility();
|
||||
for (index, point) in map.data.iter().enumerate() {
|
||||
assert!(point.visible.is_some());
|
||||
if point.visible.unwrap() {
|
||||
visible_count += 1;
|
||||
}
|
||||
else {
|
||||
invisible_points.push(index);
|
||||
}
|
||||
}
|
||||
assert_eq!(visible_count, 21);
|
||||
assert_eq!(invisible_points.len(), 4);
|
||||
assert_eq!(invisible_points, vec![8, 12, 16, 18]);
|
||||
|
||||
map.calculate_scores();
|
||||
assert_eq!(map.data[7].score.unwrap(), 4);
|
||||
assert_eq!(map.data[17].score.unwrap(), 8);
|
||||
let mut high_score = 0;
|
||||
let mut high_score_index = 0;
|
||||
for (index, point) in map.data.iter().enumerate() {
|
||||
assert!(point.score.is_some());
|
||||
if point.score.unwrap() > high_score {
|
||||
high_score = point.score.unwrap();
|
||||
high_score_index = index;
|
||||
}
|
||||
}
|
||||
assert_eq!(high_score, 8);
|
||||
assert_eq!(high_score_index, 17);
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,5 @@
|
|||
30373
|
||||
25512
|
||||
65332
|
||||
33549
|
||||
35390
|
||||
Loading…
Reference in New Issue