Finish part-1

2025/Cargo.lock

@@ -226,6 +226,7 @@ name = "day-09"
 version = "0.1.0"
 dependencies = [
  "divan",
+ "glam",
  "itertools",
  "miette",
  "nom",

2025/daily-template/src/part1.rs

@@ -1,3 +1,4 @@
+use miette::miette;
 #[tracing::instrument]
 #[allow(clippy::missing_panics_doc)]
 #[allow(clippy::missing_errors_doc)]

2025/daily-template/src/part2.rs

@@ -1,4 +1,4 @@
-use miette::Result;
+use miette::miette;
 
 #[tracing::instrument]
 #[allow(clippy::missing_panics_doc)]
@@ -13,7 +13,7 @@ mod tests {
     use super::*;
 
     #[test]
-    fn test_process() -> Result<()> {
+    fn test_process() -> miette::Result<()> {
         let input = "";
         todo!("haven't built test yet");
         let result = 0;

2025/day-09/Cargo.toml

@@ -12,6 +12,7 @@ tracing.workspace = true
 tracing-subscriber.workspace = true
 miette.workspace = true
 thiserror.workspace = true
+glam.workspace = true
 
 [dev-dependencies]
 divan.workspace = true

2025/day-09/src/part1.rs

@@ -1,9 +1,75 @@
+use glam::{USizeVec2, usize};
+use miette::miette;
+use std::str::FromStr;
+
+#[derive(Debug, Clone, Copy)]
+struct Tile(USizeVec2);
+
+impl Tile {
+    const fn x(&self) -> usize {
+        self.0.x
+    }
+
+    const fn y(&self) -> usize {
+        self.0.y
+    }
+
+    const fn area(&self, other: Self) -> usize {
+        (self.x().abs_diff(other.x()) + 1) * (self.y().abs_diff(other.y()) + 1)
+    }
+}
+
+impl FromStr for Tile {
+    type Err = String;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let str = s.trim().split(',').collect::<Vec<_>>();
+        if str.len() < 2 {
+            return Err("Missing coords".to_string());
+        }
+        Ok(Self(USizeVec2 {
+            x: str_to_usize(str[0])?,
+            y: str_to_usize(str[1])?,
+        }))
+    }
+}
+
+fn str_to_usize(s: &str) -> Result<usize, String> {
+    s.parse::<usize>().map_err(|e| e.to_string())
+}
+
+#[derive(Debug, Clone)]
+struct Grid(Vec<Tile>);
+
+impl FromStr for Grid {
+    type Err = String;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let grid = s
+            .trim()
+            .lines()
+            .map(Tile::from_str)
+            .collect::<Result<Vec<_>, _>>()?;
+        Ok(Self(grid))
+    }
+}
+
+impl Grid {
+    fn get_max_area(&self) -> usize {
+        self.area_list().max().unwrap_or(0)
+    }
+
+    fn area_list(&self) -> impl Iterator<Item = usize> {
+        self.0
+            .iter()
+            .flat_map(|&a| self.0.iter().map(move |&b| a.area(b)))
+    }
+}
+
 #[tracing::instrument]
 #[allow(clippy::missing_panics_doc)]
 #[allow(clippy::missing_errors_doc)]
 pub fn process(input: &str) -> miette::Result<usize> {
-    todo!("day xx - part 1");
-    Ok(0)
+    let grid = Grid::from_str(input).map_err(|e| miette!("{e}"))?;
+    Ok(grid.get_max_area())
 }
 
 #[cfg(test)]
@@ -12,9 +78,15 @@ mod tests {
 
     #[test]
     fn test_process() -> miette::Result<()> {
-        let input = "";
-        todo!("haven't built test yet");
-        let result = 0;
+        let input = "7,1
+11,1
+11,7
+9,7
+9,5
+2,5
+2,3
+7,3";
+        let result = 50;
         assert_eq!(process(input)?, result);
         Ok(())
     }