restructured for more days

src/day01.rs

@@ -0,0 +1,66 @@
+use itertools::Itertools;
+use std::fs::read_to_string;
+
+pub fn day_main() {
+    let input = read_to_string("input/day01.txt").unwrap();
+    println!("part1: {}", part1(&input));
+    println!("part2: {}", part2(&input));
+}
+
+type Int = i32;
+
+fn part1(input: &str) -> Int {
+    let (mut l, mut r) = make_lists(input);
+
+    l.sort();
+    r.sort();
+
+    l.into_iter()
+        .zip(r.into_iter())
+        .map(|(l, r)| (l - r).abs())
+        .sum()
+}
+
+fn part2(input: &str) -> Int {
+    let (l, r) = make_lists(input);
+
+    l.iter()
+        .map(|l| r.iter().filter(|r| *r == l).count() as Int * l)
+        .sum()
+}
+
+fn make_lists(input: &str) -> (Vec<Int>, Vec<Int>) {
+    input
+        .trim()
+        .lines()
+        .map(|line| line.split_ascii_whitespace().collect_tuple().unwrap())
+        .map(|(x, y)| (x.parse::<Int>().unwrap(), y.parse::<Int>().unwrap()))
+        .fold((vec![], vec![]), |(mut v1, mut v2), (a, b)| {
+            v1.push(a);
+            v2.push(b);
+            (v1, v2)
+        })
+}
+
+#[cfg(test)]
+mod test {
+    use super::{part1, part2};
+
+    const TEST_INPUT: &str = r"
+3   4
+4   3
+2   5
+1   3
+3   9
+3   3
+";
+
+    #[test]
+    fn test1() {
+        assert_eq!(part1(TEST_INPUT), 11);
+    }
+    #[test]
+    fn test2() {
+        assert_eq!(part2(TEST_INPUT), 31);
+    }
+}

src/day02.rs

@@ -0,0 +1,17 @@
+use std::fs::read_to_string;
+
+pub fn day_main() {
+    let input = read_to_string("input/day01.txt").unwrap();
+    println!("part1: {}", part1(&input));
+    // println!("part2: {}", part2(&input));
+}
+
+type Int = i32;
+
+fn part1(input: &str) -> Int {
+    0
+}
+
+// fn part2(input: &str) -> Int {
+//     0
+// }

src/lib.rs

@@ -0,0 +1,2 @@
+pub mod day01;
+pub mod day02;

src/main.rs

@@ -1,66 +1,11 @@
-use itertools::Itertools;
+use std::env::args;
-use std::fs::read_to_string;
+
+use advent_of_rust_2024::day01;
 
 fn main() {
-    let input = read_to_string("input/day01.txt").unwrap();
+    let day: Option<u8> = args().nth(1).and_then(|a| a.parse().ok());
-    println!("part1: {}", part1(&input));
+    match day {
-    println!("part2: {}", part2(&input));
+        Some(1) => day01::day_main(),
-}
+        _ => println!("hi"),
-
-type Int = i32;
-
-fn part1(input: &str) -> Int {
-    let (mut l, mut r) = make_lists(input);
-
-    l.sort();
-    r.sort();
-
-    l.into_iter()
-        .zip(r.into_iter())
-        .map(|(l, r)| (l - r).abs())
-        .sum()
-}
-
-fn part2(input: &str) -> Int {
-    let (l, r) = make_lists(input);
-
-    l.iter()
-        .map(|l| r.iter().filter(|r| *r == l).count() as Int * l)
-        .sum()
-}
-
-fn make_lists(input: &str) -> (Vec<Int>, Vec<Int>) {
-    input
-        .trim()
-        .lines()
-        .map(|line| line.split_ascii_whitespace().collect_tuple().unwrap())
-        .map(|(x, y)| (x.parse::<Int>().unwrap(), y.parse::<Int>().unwrap()))
-        .fold((vec![], vec![]), |(mut v1, mut v2), (a, b)| {
-            v1.push(a);
-            v2.push(b);
-            (v1, v2)
-        })
-}
-
-#[cfg(test)]
-mod test {
-    use crate::{part1, part2};
-
-    const TEST_INPUT: &str = r"
-3   4
-4   3
-2   5
-1   3
-3   9
-3   3
-";
-
-    #[test]
-    fn test1() {
-        assert_eq!(part1(TEST_INPUT), 11);
-    }
-    #[test]
-    fn test2() {
-        assert_eq!(part2(TEST_INPUT), 31);
     }
 }