day 8 solution

2022/.gitignore

@@ -1 +1,2 @@
 target
+.vscode

2022/day8.txt

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2022/src/days/day2.rs

@@ -79,9 +79,9 @@ pub fn run() -> Result<()> {
 
         let part_two_score = match part_two_goal {
             EndStates::Lose => match opponent {
-                Pieces::Rock => 3 + 0,
-                Pieces::Paper => 1 + 0,
-                Pieces::Scissors => 2 + 0,
+                Pieces::Rock => 3,
+                Pieces::Paper => 1,
+                Pieces::Scissors => 2,
             },
             EndStates::Draw => match opponent {
                 Pieces::Rock => 1 + 3,

2022/src/days/day4.rs

@@ -13,9 +13,9 @@ pub fn run() -> Result<()> {
     let mut part_two_pairs = 0;
 
     for line in lines {
-        let v: Vec<&str> = line.split(",").collect();
-        let left: Vec<u32> = v[0].split("-").map(|t| t.parse::<u32>().unwrap()).collect();
-        let right: Vec<u32> = v[1].split("-").map(|t| t.parse::<u32>().unwrap()).collect();
+        let v: Vec<&str> = line.split(',').collect();
+        let left: Vec<u32> = v[0].split('-').map(|t| t.parse::<u32>().unwrap()).collect();
+        let right: Vec<u32> = v[1].split('-').map(|t| t.parse::<u32>().unwrap()).collect();
 
         let left_outside = left[0] <= right[0] && left[1] >= right[1];
         let left_inside = left[0] >= right[0] && left[1] <= right[1];

2022/src/days/day5.rs

@@ -14,10 +14,10 @@ pub fn run() -> Result<()> {
 
     let mut containers: Vec<&str> = Vec::with_capacity(20);
     for line in file_contents.lines() {
-        if line.contains("[") {
+        if line.contains('[') {
             containers.push(line);
         } else {
-            for stacknums in line.split(" ") {
+            for stacknums in line.split(' ') {
                 if let Ok(num) = stacknums.parse::<usize>() {
                     numstacks = num;
                     stacks.push(Vec::with_capacity(100))
@@ -43,7 +43,7 @@ pub fn run() -> Result<()> {
             continue;
         }
 
-        let mut tokens = line.split(" ");
+        let mut tokens = line.split(' ');
         let count = tokens.nth(1).expect("missing count").parse::<usize>()?;
         let from = tokens.nth(1).expect("missing from").parse::<usize>()?;
         let to = tokens.nth(1).expect("missing to").parse::<usize>()?;

2022/src/days/day6.rs

@@ -20,7 +20,7 @@ fn unique_run_position<'a>(line: &'a str, count: usize) -> usize {
         }
     }
 
-    return char_counter;
+    char_counter
 }
 
 pub fn run() -> Result<()> {
@@ -35,8 +35,8 @@ pub fn run() -> Result<()> {
 
     for line in lines {
         line_counter += 1;
-        let index = unique_run_position(&line, 4);
-        let index2 = unique_run_position(&line, 14);
+        let index = unique_run_position(line, 4);
+        let index2 = unique_run_position(line, 14);
         println!("line {}\t{}\t{}", line_counter, index, index2);
     }
 

2022/src/days/day7.rs

@@ -139,10 +139,10 @@ pub fn run() -> Result<()> {
             let new_filename = format!("/{}", current_path.join("/"));
             current_path.pop();
 
-            if let None = current.files.iter().find(|x| x.name == new_filename) {
+            if !current.files.iter().any(|x| x.name == new_filename) {
                 current.files.push(File {
                     name: new_filename,
-                    size: size,
+                    size,
                 });
             }
         } else if line.starts_with("dir") {
@@ -152,7 +152,7 @@ pub fn run() -> Result<()> {
             let new_dirname = format!("/{}", current_path.join("/"));
             current_path.pop();
 
-            if let None = current.directories.iter().find(|x| x.name == new_dirname) {
+            if !current.directories.iter().any(|x| x.name == new_dirname) {
                 let dir = Dir {
                     name: new_dirname,
                     ..Default::default()

2022/src/days/day8.rs

@@ -0,0 +1,209 @@
+use anyhow::Result;
+use std::fs;
+
+type World = [[u8; 100]; 100];
+type Visible = [[bool; 100]; 100];
+
+pub fn run() -> Result<()> {
+    #[cfg(not(feature = "test_input"))]
+    let file_contents = fs::read_to_string("day8.txt")?;
+
+    #[cfg(feature = "test_input")]
+    let file_contents = fs::read_to_string("tests/day8.txt")?;
+
+    let mut world: World = [[0; 100]; 100];
+
+    let mut size = 0;
+    for (row, line) in file_contents.lines().enumerate() {
+        size = row;
+        for (col, x) in line.chars().enumerate() {
+            world[row][col] = x.to_digit(10).expect("invalid digit") as u8;
+        }
+    }
+    size += 1;
+    println!("world size {}", size);
+    for row in world.iter().take(size) {
+        for col in row.iter().take(size) {
+            print!("{}", *col);
+        }
+        println!();
+    }
+
+    let mut visible: Visible = [[false; 100]; 100];
+    println!(
+        "part one {}",
+        part_one_visibility(&world, size, &mut visible)
+    );
+    println!("part two {}", part_two_score(&world, size, &visible));
+
+    Ok(())
+}
+
+fn part_one_visibility(world: &World, max_size: usize, visible: &mut Visible) -> usize {
+    for i in 0..max_size {
+        visible[i][max_size - 1] = true;
+        visible[i][0] = true;
+        visible[0][i] = true;
+        visible[max_size - 1][i] = true;
+    }
+
+    biggest_top(world, max_size, visible);
+    biggest_bottom(world, max_size, visible);
+    biggest_left(world, max_size, visible);
+    biggest_right(world, max_size, visible);
+
+    println!("visible trees");
+    let mut count: usize = 0;
+    for row in visible.iter().take(max_size) {
+        for col in row.iter().take(max_size) {
+            if *col {
+                count += 1;
+                print!("1");
+            } else {
+                print!("0");
+            }
+        }
+        println!();
+    }
+
+    count
+}
+
+fn part_two_score(world: &World, max_size: usize, visible: &Visible) -> usize {
+    let mut score: usize = 0;
+
+    for row in 1..(max_size - 1) {
+        for col in 1..(max_size - 1) {
+            if visible[row][col] {
+                let new_score = get_visibility_score(world, max_size, row, col);
+                if new_score > score {
+                    score = new_score;
+                }
+            }
+        }
+    }
+
+    score
+}
+
+fn get_visibility_score(world: &World, max_size: usize, row: usize, col: usize) -> usize {
+    let height = world[row][col];
+
+    let mut north: usize = 0;
+    for k in (0..row).rev() {
+        if world[k][col] < height {
+            north += 1;
+        } else if world[k][col] >= height {
+            north += 1;
+            break;
+        } else {
+            break;
+        }
+    }
+
+    let mut south: usize = 0;
+    for i in (row + 1)..max_size {
+        if world[i][col] < height {
+            south += 1;
+        } else if world[i][col] >= height {
+            south += 1;
+            break;
+        } else {
+            break;
+        }
+    }
+
+    let mut west: usize = 0;
+    for k in (0..col).rev() {
+        if world[row][k] < height {
+            west += 1;
+        } else if world[row][k] >= height {
+            west += 1;
+            break;
+        } else {
+            break;
+        }
+    }
+
+    let mut east: usize = 0;
+    for i in (col + 1)..max_size {
+        if world[row][i] < height {
+            east += 1;
+        } else if world[row][i] >= height {
+            east += 1;
+            break;
+        } else {
+            break;
+        }
+    }
+
+    north * south * east * west
+}
+
+fn biggest_left(world: &World, max_size: usize, visible: &mut Visible) {
+    let mut sizes: [u8; 100] = [0; 100];
+
+    for i in 0..max_size {
+        sizes[i] = world[i][0];
+    }
+
+    for row in 1..max_size {
+        for col in 1..max_size {
+            if world[row][col] > sizes[row] {
+                visible[row][col] = true;
+                sizes[row] = world[row][col];
+            }
+        }
+    }
+}
+
+fn biggest_right(world: &World, max_size: usize, visible: &mut Visible) {
+    let mut sizes: [u8; 100] = [0; 100];
+
+    for i in 0..max_size {
+        sizes[i] = world[i][max_size];
+    }
+
+    for row in 1..max_size {
+        for j in 1..max_size {
+            let col = max_size - j;
+            if world[row][col] > sizes[row] {
+                visible[row][col] = true;
+                sizes[row] = world[row][col];
+            }
+        }
+    }
+}
+
+fn biggest_top(world: &World, max_size: usize, visible: &mut Visible) {
+    let mut sizes: [u8; 100] = [0; 100];
+
+    sizes[..max_size].copy_from_slice(&world[0][..max_size]);
+
+    for col in 1..max_size {
+        for row in 1..max_size {
+            if world[row][col] > sizes[col] {
+                visible[row][col] = true;
+                sizes[col] = world[row][col];
+            }
+        }
+    }
+}
+
+fn biggest_bottom(world: &World, max_size: usize, visible: &mut Visible) {
+    let mut sizes: [u8; 100] = [0; 100];
+
+    for i in 0..max_size {
+        sizes[i] = world[max_size - 1][i];
+    }
+
+    for col in 1..max_size {
+        for i in 1..max_size {
+            let row = max_size - i;
+            if world[row][col] > sizes[col] {
+                visible[row][col] = true;
+                sizes[col] = world[row][col];
+            }
+        }
+    }
+}

2022/src/days/mod.rs

@@ -5,3 +5,4 @@ pub mod day4;
 pub mod day5;
 pub mod day6;
 pub mod day7;
+pub mod day8;

2022/src/main.rs

@@ -33,6 +33,9 @@ fn run_day(number: i32) -> Result<()> {
         7 => {
             days::day7::run()?;
         }
+        8 => {
+            days::day8::run()?;
+        }
         _ => return Err(anyhow!("Invalid day provided")),
     }
     Ok(())
@@ -61,7 +64,7 @@ fn main() -> Result<()> {
                 };
                 println!("Day {}", number);
                 run_day(number)?;
-                println!("");
+                println!();
             }
         }
     }

2022/tests/day8.txt

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