commit 7db0c7c6c4a6de780d61146222cfbf7da8788b37
Author: Malte <malte@drabesch.de>
Date:   Sun Dec 1 13:34:34 2024 +0100

    add day01 soulution

diff --git a/2024/Cargo.lock b/2024/Cargo.lock
new file mode 100644
index 0000000..5d41a28
--- /dev/null
+++ b/2024/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc2024"
+version = "0.1.0"
diff --git a/2024/Cargo.toml b/2024/Cargo.toml
new file mode 100644
index 0000000..3453c1c
--- /dev/null
+++ b/2024/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "aoc2024"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/2024/input/01_input.txt b/2024/input/01_input.txt
new file mode 100644
index 0000000..863e4f7
--- /dev/null
+++ b/2024/input/01_input.txt
@@ -0,0 +1,1000 @@
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diff --git a/2024/src/day01.rs b/2024/src/day01.rs
new file mode 100644
index 0000000..76c0ee4
--- /dev/null
+++ b/2024/src/day01.rs
@@ -0,0 +1,47 @@
+use std::fs::read_to_string;
+
+fn read_as_vectors(input: &str) -> (Vec<i32>, Vec<i32>) {
+    let input = read_to_string(input).unwrap();
+    let (left, right): (Vec<_>, Vec<_>) = input
+        .lines()
+        .map(|x| {
+            let mut l = x.split_whitespace().map(|n| n.parse::<i32>().unwrap());
+            (l.next().unwrap(), l.next().unwrap())
+        })
+        .unzip();
+    (left, right)
+}
+
+pub fn stage1(input: &str) -> i32 {
+    let (mut left, mut right) = read_as_vectors(input);
+    left.sort();
+    right.sort();
+    let res: i32 = left
+        .iter()
+        .zip(right.iter())
+        .map(|(l, r)| (l - r).abs())
+        .sum();
+    res
+}
+
+pub fn stage2(input: &str) -> i32 {
+    let (left, right) = read_as_vectors(input);
+    left.iter()
+        .map(|l| right.iter().filter(|&f| *f == *l).count() as i32 * l)
+        .sum()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_stage1() {
+        assert_eq!(stage1("input/01_input.txt"), 1590491);
+    }
+
+    #[test]
+    fn test_stage2() {
+        assert_eq!(stage2("input/01_input.txt"), 22588371);
+    }
+}
diff --git a/2024/src/lib.rs b/2024/src/lib.rs
new file mode 100644
index 0000000..c3ba043
--- /dev/null
+++ b/2024/src/lib.rs
@@ -0,0 +1,2 @@
+#[allow(dead_code)]
+mod day01;