day 14

src/bin/template.rs

@@ -23,7 +23,7 @@ fn part1(input: String) -> Result<usize> {
 
     // algo
     let a_start = Instant::now();
-    let answer = 0;
+    let mut answer = 0;
     let algo_time = a_start.elapsed();
 
     // output
@@ -42,7 +42,7 @@ fn part2(input: String) -> Result<usize> {
 
     // algo
     let a_start = Instant::now();
-    let answer = 0;
+    let mut answer = 0;
     let algo_time = a_start.elapsed();
 
     // output

src/bin/test.rs

@@ -1 +1,38 @@
+use aoc23::prelude::*;
 
+#[derive(Debug, Clone)]
+enum Tile {
+    None,
+    Round,
+    Square,
+}
+
+fn get_columns<'a>(matrix: &'a mut Vec<Vec<Tile>>) -> Vec<Vec<&'a mut Tile>> {
+    let mut columns = vec![];
+    let cols = matrix.first().map_or(0, Vec::len);
+    let rows = matrix.len();
+    for col_idx in 0..cols {
+        let mut column = vec![];
+        for row_idx in 0..rows {
+            column.push(&mut matrix[row_idx][col_idx]);
+        }
+        columns.push(column);
+    }
+    columns
+}
+
+fn tilt(rocks: &mut Vec<&mut Tile>) {
+    for rock in rocks.iter_mut() {
+        **rock = Tile::Round;
+    }
+}
+
+fn main() -> Result<()> {
+    // 10 x 10 grid of None
+    let mut matrix: Vec<Vec<Tile>> = vec![vec![Tile::None; 10]; 10];
+    println!("BEFORE:\n{:?}", matrix);
+    let mut columns = get_columns(&mut matrix);
+    tilt(columns.get_mut(0).unwrap());
+    println!("AFTER:\n{:?}", matrix);
+    Ok(())
+}