[TASK] Implemented Day 8

input/day8.txt

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input/day8_example.txt

@@ -0,0 +1,5 @@
+30373
+25512
+65332
+33549
+35390

src/day8.rs

@@ -0,0 +1,201 @@
+use std::{fmt::{Debug, Display}};
+
+use crate::day_solver::DaySolver;
+
+use super::util;
+
+#[derive(Debug, Clone)]
+pub struct Grid<T> {
+    width: usize,
+    data: Vec<T>
+}
+
+impl<T: Clone + Sized> Grid<T> {
+
+    #[allow(dead_code)]
+    fn set_row(&mut self, x: usize, v: T) {
+        // let range = &mut self.data[x * self.width..(x+1) * self.width];
+        for i in self.width * x..self.width * (x + 1) {
+            self.data[i] = v.to_owned();
+        }
+    }
+
+    #[allow(dead_code)]
+    fn set_col(&mut self, x: usize, v: T) {
+        for y in 0..self.height() {
+            let idx = self.idx(&x, &y);
+            self.data[idx] = v.to_owned();
+        }
+    }
+
+    fn idx(&self, x: &usize, y: &usize) -> usize {
+        y * self.width + x
+    }
+
+    fn height(&self) -> usize {
+        self.data.len() / self.width
+    }
+
+    fn get(&self, x: &usize, y: &usize) -> &T {
+        let idx = self.idx(x, y);
+        &self.data[idx]
+
+    }
+}
+
+impl <T: Display + Clone + Sized> Grid<T> {
+
+    #[allow(dead_code)]
+    fn print(&self) {
+
+        for y in 0..self.height() {
+            for x in 0..self.width {
+                print!("{}", self.get(&x, &y))
+            }
+            println!();
+        }
+
+    }
+} 
+
+#[derive(Debug, Clone)]
+pub struct Day8 {
+    grid: Grid<u8>
+}
+
+impl Day8 {
+
+    pub fn create() -> Self {
+        // let lines = util::read_file("input/day8_example.txt");
+        let lines = util::read_file("input/day8.txt");
+
+        // Put the input into the day struct
+        let grid = Grid {
+            width: lines.first().unwrap().len(),
+            data: lines.join("").chars().map(|c| c.to_digit(10).unwrap() as u8).collect()
+        };
+        // println!("{:?}", grid);
+        return Day8 {
+            grid
+        }
+    }
+
+    fn calc_required_heights_for_x_range<R>(&self, y: usize, required_heights: &mut Grid<u8>, range: R) 
+        where R: IntoIterator<Item = usize> {
+
+        let mut min_required_height = 0;
+        for x in range {
+            self.update_required_heights(x, y, required_heights, &mut min_required_height);
+            if min_required_height >= 10 { break }
+        }
+    }
+
+    fn calc_required_heights_for_y_range<R>(&self, x: usize, required_heights: &mut Grid<u8>, range: R) 
+        where R: IntoIterator<Item = usize> {
+
+        let mut min_required_height = 0;
+        for y in range {
+            self.update_required_heights(x, y, required_heights, &mut min_required_height);
+            if min_required_height >= 10 { break }
+        }
+    }
+
+    fn update_required_heights(&self, x: usize, y: usize, required_heights: &mut Grid<u8>, min_required_height: &mut u8) {
+        let idx = self.grid.idx(&x, &y);
+        if required_heights.data[idx] >= *min_required_height {
+            required_heights.data[idx] = *min_required_height
+        }
+        let tree_height = self.grid.data[idx];
+        if tree_height + 1 > *min_required_height {
+            *min_required_height = tree_height + 1;
+        }
+    }
+
+    fn calc_viewing_dist_x<R>(&self, cur_height: &u8, x_range: R, y: &usize) -> usize
+    where R: IntoIterator<Item = usize> {
+
+        let mut count = 0;
+        for x in x_range {
+            count += 1;
+            if self.grid.get(&x, &y) >= cur_height {
+                break;
+            }
+        }
+        count
+    }
+
+    fn calc_viewing_dist_y<R>(&self, cur_height: &u8, x: &usize, y_range: R) -> usize
+    where R: IntoIterator<Item = usize> {
+
+        let mut count = 0;
+        for y in y_range {
+            count += 1;
+            if self.grid.get(&x, &y) >= &cur_height {
+                break;
+            }
+        }
+        count
+    }
+}
+
+impl DaySolver for Day8 {
+
+
+    fn solve_part1(&mut self) -> String {
+        let mut required_heights: Grid<u8> = Grid { 
+            width: self.grid.width, 
+            data: vec![10u8; self.grid.data.len()]
+        };
+
+        // First, we go over the rows, scanning them left-to-right
+        for y in 0..self.grid.height() {
+
+            self.calc_required_heights_for_x_range(y, &mut required_heights, 0..self.grid.width);
+            // println!("After y = {} L2R", y);
+            // required_heights.print();
+            self.calc_required_heights_for_x_range(y, &mut required_heights, (0..self.grid.width).rev());
+            // println!("After y = {} R2L", y);
+            // required_heights.print();
+        }
+
+        for x in 0..self.grid.width {
+
+            self.calc_required_heights_for_y_range(x, &mut required_heights, 0..self.grid.height());
+            self.calc_required_heights_for_y_range(x, &mut required_heights, (0..self.grid.height()).rev());
+        }
+
+        // required_heights.print();
+
+        let mut visible_trees = 0;
+        for i in 0..required_heights.data.len() {
+            if self.grid.data[i] >= required_heights.data[i] {
+                visible_trees += 1;
+            }
+        }
+        return visible_trees.to_string();
+    }
+
+    fn solve_part2(&mut self) -> String {
+
+        // Note that we skip the edges; since one of the distances is 0, the scenic score will also be 0
+        let mut max_scenic_score = 0;
+        for y in 1..self.grid.height() - 1 {
+            for x in 1..self.grid.width - 1 {
+                
+                let cur_height = self.grid.get(&x, &y);
+                let right_view = self.calc_viewing_dist_x(cur_height, x+1..self.grid.width, &y);
+                let left_view = self.calc_viewing_dist_x(cur_height, (0..x).rev(), &y);
+                let up_view = self.calc_viewing_dist_y(cur_height, &x, y + 1..self.grid.height());
+                let down_view = self.calc_viewing_dist_y(cur_height, &x, (0..y).rev());
+
+                let scenic_score = left_view * right_view * up_view * down_view;
+                if scenic_score > max_scenic_score {
+                    max_scenic_score = scenic_score;
+                }
+
+            }
+        }
+
+        return max_scenic_score.to_string();
+    }
+}

src/main.rs

@@ -6,6 +6,7 @@ use crate::day4::Day4;
 use crate::day5::Day5;
 use crate::day6::Day6;
 use crate::day7::Day7;
+use crate::day8::Day8;
 use crate::day_solver::DaySolver;
 
 mod util;
@@ -17,8 +18,9 @@ mod day4;
 mod day5;
 mod day6;
 mod day7;
+mod day8;
 
-const MAX_DAY: u8 = 7;
+const MAX_DAY: u8 = 8;
 const DEFAULT_BENCHMARK_AMOUNT: u32 = 100;
 
 fn main() {
@@ -89,6 +91,7 @@ fn build_day_solver(day: u8) -> Option<Box<dyn DaySolver>> {
         5 => Some(Box::new(Day5::create())),
         6 => Some(Box::new(Day6::create())),
         7 => Some(Box::new(Day7::create())),
+        8 => Some(Box::new(Day8::create())),
         _ => None
     }
 }