Implement 2025 - Day 9 - Part 1

2025/09.rs

@@ -0,0 +1,28 @@
+---cargo
+---
+
+static CONTENT: &'static str = include_str!("./inputs/09_1.txt");
+
+fn main() {
+    let points: Vec<(usize, usize)> = CONTENT.lines().map(|l| l.trim()).filter(|l| !l.is_empty()).map(|l| {
+        let (first, second) = l.split_once(',').unwrap();
+
+        let first = first.parse::<usize>().unwrap();
+        let second = second.parse::<usize>().unwrap();
+
+        (first, second)
+    }).collect();
+    println!("Points:\n{:?}", points);
+
+    let mut rects: Vec<((usize, usize), (usize, usize), usize)> = points.iter()
+        .flat_map(|p| core::iter::repeat(*p).zip(points.iter().copied()))
+        .filter(|(f, s)| f != s)
+        .map(|(f, s)| (f, s, (f.0.abs_diff(s.0)+1) * (f.1.abs_diff(s.1)+1)))
+        .collect();
+
+    rects.sort_by_key(|(_, _, a)| *a);
+
+    // println!("Rectangle: {:?}", rects);
+    
+    println!("Largest: {:?}", rects.last().unwrap());
+}