2022 day1/rust: add solution

2022/day1/rust/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "rust_2022_01"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

2022/day1/rust/src/main.rs

@@ -0,0 +1,18 @@
+use std::{cmp::Reverse, io::stdin};
+
+fn main() {
+    let lines: Vec<_> = stdin().lines().map(Result::unwrap).collect();
+    let mut elves: Vec<_> = lines
+        .split(|s| s.is_empty())
+        .map(|entries| {
+            entries
+                .iter()
+                .map(|c| c.parse::<u64>().unwrap())
+                .sum::<u64>()
+        })
+        .collect();
+    elves.sort_by_key(|&s| Reverse(s));
+
+    println!("{}", elves[0]);
+    println!("{}", &elves[..3].iter().sum::<u64>());
+}

Cargo.toml

@@ -9,4 +9,5 @@ members = [
 	"2021/day14/rust",
 	"2021/day16/rust",
 	"2021/day22/rust",
+	"2022/day1/rust",
 ]