day 11 part 1

2023/Cargo.lock

@@ -198,6 +198,13 @@ dependencies = [
  "itertools",
 ]
 
+[[package]]
+name = "day-11"
+version = "0.1.0"
+dependencies = [
+ "color-eyre",
+]
+
 [[package]]
 name = "either"
 version = "1.9.0"

2023/day-11/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "day-11"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+color-eyre.workspace = true

2023/day-11/input.txt

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+.......................................................................................#........................................#..........#
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2023/day-11/src/bin/part1.rs

@@ -0,0 +1,9 @@
+use color_eyre::Result;
+use day_11::part1::process;
+
+fn main() -> Result<()> {
+    let file = include_str!("../../input.txt");
+    let result = process(file)?;
+    println!("{}", result);
+    Ok(())
+}

2023/day-11/src/bin/part2.rs

@@ -0,0 +1,9 @@
+use color_eyre::Result;
+use day_11::part2::process;
+
+fn main() -> Result<()> {
+    let file = include_str!("../../input.txt");
+    let result = process(file)?;
+    println!("{}", result);
+    Ok(())
+}

2023/day-11/src/lib.rs

@@ -0,0 +1,2 @@
+pub mod part1;
+pub mod part2;

2023/day-11/src/part1.rs

@@ -0,0 +1,210 @@
+use color_eyre::Result;
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+enum Universe {
+    Galaxy,
+    Empty,
+}
+
+impl Universe {
+    fn is_empty(&self) -> bool {
+        match self {
+            Universe::Galaxy => false,
+            Universe::Empty => true,
+        }
+    }
+}
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+struct Point {
+    x: usize,
+    y: usize,
+}
+
+impl Point {
+    fn new(x: usize, y: usize) -> Self {
+        Self { x, y }
+    }
+
+    fn distance(&self, other: &Self) -> usize {
+        (self.x as i32 - other.x as i32).abs() as usize
+            + (self.y as i32 - other.y as i32).abs() as usize
+    }
+}
+
+fn expand_universe(input: Vec<Vec<Universe>>) -> Result<Vec<Vec<Universe>>> {
+    let mut output = input.clone();
+    let mut add_cols = Vec::new();
+    let mut add_rows = Vec::new();
+
+    // Check if any row contains only dots
+    for (idx, line) in input.iter().enumerate() {
+        if line.iter().all(|&ch| ch.is_empty()) {
+            add_rows.push(idx + 1);
+        }
+    }
+
+    // Check if any column contains only dots
+    let num_cols = input.first().unwrap().len();
+    for col in 0..num_cols {
+        if input.iter().all(|line| line.get(col).unwrap().is_empty()) {
+            add_cols.push(col);
+        }
+    }
+
+    // Add rows if necessary
+    for row in add_rows {
+        let new_row = vec![Universe::Empty; num_cols];
+        output.insert(row, new_row);
+    }
+
+    // Add columns if necessary
+    for (idx, &col) in add_cols.iter().enumerate() {
+        for line in output.iter_mut() {
+            line.insert(col + idx + 1, Universe::Empty);
+        }
+    }
+
+    Ok(output)
+}
+
+pub fn process(input: &str) -> Result<usize> {
+    let universe: Vec<Vec<Universe>> = input
+        .lines()
+        .map(|line| {
+            line.chars()
+                .map(|ch| match ch {
+                    '.' => Universe::Empty,
+                    '#' => Universe::Galaxy,
+                    _ => unimplemented!(),
+                })
+                .collect()
+        })
+        .collect();
+
+    // Create a vector of points
+    let points = expand_universe(universe)?.iter().enumerate().fold(
+        Vec::new(),
+        |acc: Vec<Point>, (y, row)| {
+            row.iter().enumerate().fold(acc, |mut acc, (x, col)| {
+                if !col.is_empty() {
+                    acc.push(Point::new(x + 1, y + 1));
+                }
+                acc
+            })
+        },
+    );
+
+    // Sum the shortest path between each pair of points
+    let sum = points.iter().enumerate().fold(0, |acc, (idx, point)| {
+        points
+            .iter()
+            .skip(idx + 1)
+            .fold(acc, |acc, other| acc + point.distance(other))
+    });
+
+    Ok(sum)
+
+    /* TRIED
+
+    - 10492576
+
+    */
+}
+
+#[cfg(test)]
+mod tests {
+
+    use super::*;
+
+    #[test]
+    fn test_process() -> Result<()> {
+        let input = "...#......
+.......#..
+#.........
+..........
+......#...
+.#........
+.........#
+..........
+.......#..
+#...#.....";
+        assert_eq!(374, process(input)?);
+        Ok(())
+    }
+
+    #[test]
+    fn test_expand_no_expansion_needed() -> Result<()> {
+        let input = vec![
+            vec![Universe::Galaxy, Universe::Empty],
+            vec![Universe::Empty, Universe::Galaxy],
+        ];
+        assert_eq!(expand_universe(input.clone())?, input);
+        Ok(())
+    }
+
+    #[test]
+    fn test_expand_last_rows() -> Result<()> {
+        let input = vec![
+            vec![Universe::Galaxy, Universe::Galaxy],
+            vec![Universe::Empty, Universe::Empty],
+        ];
+        assert_eq!(
+            expand_universe(input)?,
+            vec![
+                vec![Universe::Galaxy, Universe::Galaxy],
+                vec![Universe::Empty, Universe::Empty],
+                vec![Universe::Empty, Universe::Empty],
+            ]
+        );
+        Ok(())
+    }
+
+    #[test]
+    fn test_expand_first_rows() -> Result<()> {
+        let input = vec![
+            vec![Universe::Empty, Universe::Empty],
+            vec![Universe::Galaxy, Universe::Galaxy],
+        ];
+        assert_eq!(
+            expand_universe(input)?,
+            vec![
+                vec![Universe::Empty, Universe::Empty],
+                vec![Universe::Empty, Universe::Empty],
+                vec![Universe::Galaxy, Universe::Galaxy],
+            ]
+        );
+        Ok(())
+    }
+
+    #[test]
+    fn test_expand_first_columns() -> Result<()> {
+        let input = vec![
+            vec![Universe::Empty, Universe::Galaxy],
+            vec![Universe::Empty, Universe::Galaxy],
+        ];
+        assert_eq!(
+            expand_universe(input)?,
+            vec![
+                vec![Universe::Empty, Universe::Empty, Universe::Galaxy],
+                vec![Universe::Empty, Universe::Empty, Universe::Galaxy],
+            ]
+        );
+        Ok(())
+    }
+
+    #[test]
+    fn test_expand_last_columns() -> Result<()> {
+        let input = vec![
+            vec![Universe::Galaxy, Universe::Empty],
+            vec![Universe::Galaxy, Universe::Empty],
+        ];
+        assert_eq!(
+            expand_universe(input)?,
+            vec![
+                vec![Universe::Galaxy, Universe::Empty, Universe::Empty],
+                vec![Universe::Galaxy, Universe::Empty, Universe::Empty],
+            ]
+        );
+        Ok(())
+    }
+}

2023/day-11/src/part2.rs

@@ -0,0 +1,19 @@
+use color_eyre::Result;
+
+pub fn process(input: &str) -> Result<usize> {
+    todo!("day xx - part 2");
+    Ok(0)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_process() -> Result<()> {
+        let input = "";
+        todo!("haven't built test yet");
+        assert_eq!(0, process(input)?);
+        Ok(())
+    }
+}