day02: initial commit

src/day02/mod.rs

@@ -0,0 +1,52 @@
+use std::{error::Error, fs};
+
+/// Solves the problem for day 02.
+///
+/// # Errors
+///
+/// This function will return an error if the file cannot be read or if the input is invalid.
+pub fn solve_day02(path: &str) -> Result<i32, Box<dyn Error>> {
+    let content = fs::read_to_string(path)?;
+
+    let data: Vec<Vec<i32>> = content
+        .split_terminator('\n')
+        .map(|line| {
+            line.split_whitespace()
+                .map(str::parse)
+                .collect::<Result<Vec<_>, _>>()
+        })
+        .collect::<Result<Vec<_>, _>>()?;
+    Ok(0)
+}
+
+fn calculate_report_safety(data: &Vec<Vec<i32>>) -> i32 {
+    data.iter()
+        .map(|reports| {
+            for report in reports {
+                todo!("Implement this")
+            }
+            0
+        })
+        .sum()
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_day02() {
+        let input = vec![
+            vec![7, 6, 4, 2, 1],
+            vec![1, 2, 7, 8, 9],
+            vec![9, 7, 6, 2, 1],
+            vec![1, 3, 2, 4, 5],
+            vec![8, 6, 4, 4, 1],
+            vec![1, 3, 6, 7, 9],
+        ];
+
+        let want = 2;
+
+        assert_eq!(calculate_report_safety(&input), want);
+    }
+}

src/lib.rs

@@ -1 +1,2 @@
 pub mod day01;
+pub mod day02;