day08 task 1

src/main.rs

@@ -1,5 +1,5 @@
 mod tasks;
 
 fn main() {
-    tasks::day06::run();
+    tasks::day08::run();
 }

src/tasks/day06.rs

@@ -1,6 +1,7 @@
 use std::collections::HashMap;
 use std::collections::VecDeque;
 
+#[allow(dead_code)]
 pub fn run() {
     let input = std::fs::read_to_string("input/day06.txt").unwrap();
     let orbits: Vec<_> = input

src/tasks/day08.rs

@@ -0,0 +1,24 @@
+#[allow(dead_code)]
+pub fn run() {
+    let size = 25 * 6;
+    let raw: Vec<u8> = std::fs::read_to_string("input/day08.txt")
+        .unwrap()
+        .chars()
+        .map(|c| c.to_digit(10).unwrap() as u8)
+        .collect();
+    let mut images = Vec::<Vec<u8>>::new();
+    for chunk in raw.chunks(size) {
+        images.push(chunk.iter().map(|it| *it).collect());
+    }
+    task1(&images);
+}
+
+fn task1(images: &Vec<Vec<u8>>) {
+    let fewest_zeros_layer = images
+        .iter()
+        .min_by_key(|it| it.iter().filter(|i| **i == 0).count())
+        .unwrap();
+    let ones = fewest_zeros_layer.iter().filter(|i| **i == 1).count();
+    let twos = fewest_zeros_layer.iter().filter(|i| **i == 2).count();
+    println!("Task 1: {}", ones * twos);
+}

src/tasks/mod.rs

@@ -2,3 +2,4 @@ pub mod day01;
 pub mod day03;
 pub mod day04;
 pub mod day06;
+pub mod day08;