add until day05-1

day02/Cargo.lock

@@ -0,0 +1,25 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "day02"
+version = "0.1.0"
+dependencies = [
+ "itertools",
+]
+
+[[package]]
+name = "either"
+version = "1.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91622ff5e7162018101f2fea40d6ebf4a78bbe5a49736a2020649edf9693679e"
+
+[[package]]
+name = "itertools"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b192c782037fadd9cfa75548310488aabdbf3d2da73885b31bd0abd03351285"
+dependencies = [
+ "either",
+]

day02/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "day02"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+itertools = "0.14.0"

day02/example.txt

@@ -0,0 +1,2 @@
+2x3x4
+1x1x10

day02/src/main.rs

@@ -0,0 +1,46 @@
+use itertools::Itertools;
+
+#[cfg(debug_assertions)]
+const FILENAME: &str = "example.txt";
+#[cfg(not(debug_assertions))]
+const FILENAME: &str = "input.txt";
+
+fn main() {
+    let data = std::fs::read_to_string(FILENAME).unwrap();
+
+    part_1(&data);
+    part_2(&data);
+}
+
+fn part_2(data: &str) {
+    let mut sum = 0;
+    for line in data.lines() {
+        let edges: Vec<_> = line
+            .split('x')
+            .map(|x| x.parse::<usize>().unwrap())
+            .collect();
+
+        let perimeter = edges.iter().sorted().take(2).sum::<usize>() * 2;
+        let volume = edges.iter().product::<usize>();
+
+        sum += perimeter + volume;
+    }
+    println!("{sum}");
+}
+
+fn part_1(data: &str) {
+    let mut sum = 0;
+    for line in data.lines() {
+        let sides: Vec<_> = line
+            .split('x')
+            .map(|x| x.parse::<usize>().unwrap())
+            .combinations(2)
+            .map(|x| x[0] * x[1])
+            .collect();
+
+        let smallest = sides.iter().min().copied().unwrap();
+
+        sum += sides.into_iter().sum::<usize>() * 2 + smallest;
+    }
+    println!("{sum}");
+}