day23 part1

src/main.rs

@@ -1,4 +1,4 @@
 fn main() {
-    aoc_2018::tasks::day22::both();
+    aoc_2018::tasks::day23::task1();
     // aoc_2018::tasks::day15::task2();
 }

src/tasks/day23.rs

@@ -0,0 +1,45 @@
+use crate::utils;
+extern crate regex;
+use regex::Regex;
+
+pub fn task1() {
+    let input = utils::read_file("input/day23.txt");
+    let regex =
+        Regex::new(r"^pos=<(?P<x>-?\d+),(?P<y>-?\d+),(?P<z>-?\d+)>, r=(?P<range>\d+)$").unwrap();
+    let bots: Vec<Bot> = input
+        .lines()
+        .map(|line| {
+            let m = regex.captures(line).unwrap();
+            let x = m["x"].parse::<isize>().unwrap();
+            let y = m["y"].parse::<isize>().unwrap();
+            let z = m["z"].parse::<isize>().unwrap();
+            let range = m["range"].parse::<usize>().unwrap();
+
+            Bot { x, y, z, range }
+        })
+        .collect();
+
+    let big_bot = bots.iter().max_by_key(|it| it.range).unwrap();
+    println!("The bot with largest range is {:?}", big_bot);
+
+    let bots_in_range = bots
+        .iter()
+        .filter(|other| big_bot.distance(other) <= big_bot.range)
+        .count();
+
+    println!("There are {} bots in range of the big bot.", bots_in_range);
+}
+
+#[derive(Debug)]
+struct Bot {
+    x: isize,
+    y: isize,
+    z: isize,
+    range: usize,
+}
+
+impl Bot {
+    fn distance(&self, other: &Self) -> usize {
+        ((other.x - self.x).abs() + (other.y - self.y).abs() + (other.z - self.z).abs()) as usize
+    }
+}

src/tasks/mod.rs

@@ -15,3 +15,4 @@ pub mod day14;
 pub mod day15;
 pub mod day20;
 pub mod day22;
+pub mod day23;