chore: WIP for y2025::day_09::part_2

Author: clechasseur

aoclp_solutions/src/y2025/day_09.rs

@@ -1,6 +1,11 @@
+use std::collections::{HashMap, HashSet};
+use std::hash::Hash;
+use std::iter::successors;
+
 use aoclp::positioning::pt::{rectangular_area, Pt};
 use aoclp::solvers_impl::input::safe_get_input_as_many;
 use itertools::Itertools;
+use strum::EnumIs;
 
 pub fn part_1() -> i64 {
     input()
@@ -15,6 +20,35 @@ pub fn part_2() -> usize {
     0
 }
 
+#[derive(Debug, Default, Copy, Clone, PartialEq, Eq, Hash, EnumIs)]
+enum Tile {
+    #[default]
+    Pink,
+    Red,
+    Green,
+}
+
+#[derive(Debug, Clone)]
+struct Floor(HashMap<Pt, Tile>);
+
+impl Default for Floor {
+    fn default() -> Self {
+        let tiles = input();
+
+        let _path: HashSet<_> = tiles
+            .iter()
+            .tuple_windows()
+            .flat_map(|(a, b)| {
+                let displacement = Pt::new((b.x - a.x).signum(), (b.y - a.y).signum());
+                let b = *b;
+                successors(Some(*a), move |&p| (p != b).then_some(p + displacement))
+            })
+            .collect();
+
+        todo!()
+    }
+}
+
 fn input() -> Vec<Pt> {
     safe_get_input_as_many(2025, 9)
 }