Day1

day1/rust/Cargo.lock

@@ -0,0 +1,25 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "either"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60b1af1c220855b6ceac025d3f6ecdd2b7c4894bfe9cd9bda4fbb4bc7c0d4cf0"
+
+[[package]]
+name = "itertools"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "413ee7dfc52ee1a4949ceeb7dbc8a33f2d6c088194d9f922fb8318faf1f01186"
+dependencies = [
+ "either",
+]
+
+[[package]]
+name = "rust"
+version = "0.1.0"
+dependencies = [
+ "itertools",
+]

day1/rust/Cargo.toml

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+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+itertools = "0.13.0"

day1/rust/src/main.rs

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+use itertools::Itertools;
+
+fn main() {
+    let stdin = std::io::stdin();
+
+    let mut left_list = Vec::new();
+    let mut right_list = Vec::new();
+
+    for line in stdin.lines() {
+        let line = line.unwrap();
+
+        let (left, right) = line
+            .split_whitespace()
+            .map(|e| e.parse::<isize>().unwrap())
+            .collect_tuple()
+            .unwrap();
+
+        left_list.push(left);
+        right_list.push(right);
+    }
+
+    left_list.sort();
+    right_list.sort();
+
+    let distance: isize = left_list
+        .iter()
+        .zip(&right_list)
+        .map(|(left, right)| left - right)
+        .map(|e| e.abs())
+        .sum();
+
+    println!("{}", distance);
+
+    let similarity: usize = left_list
+        .iter()
+        .map(|e| usize::try_from(*e).unwrap() * right_list.iter().filter(|n| *n == e).count())
+        .sum();
+
+    println!("{}", similarity);
+}