cleaned up code

Cargo.lock

@@ -5,3 +5,21 @@ version = 3
 [[package]]
 name = "aoc_2022"
 version = "0.1.0"
+dependencies = [
+ "itertools",
+]
+
+[[package]]
+name = "either"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90e5c1c8368803113bf0c9584fc495a58b86dc8a29edbf8fe877d21d9507e797"
+
+[[package]]
+name = "itertools"
+version = "0.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0fd2260e829bddf4cb6ea802289de2f86d6a7a690192fbe91b3f46e0f2c8473"
+dependencies = [
+ "either",
+]

Cargo.toml

@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+itertools = "0.10.5"

src/day1.rs

@@ -1,3 +1,4 @@
+use itertools::Itertools;
 use std::fs;
 
 pub fn run() {
@@ -11,33 +12,30 @@ pub fn run() {
 fn part1(food_input: &str) -> usize {
     food_input
         .split("\n\n")
-        .collect::<Vec<&str>>()
         .into_iter()
         .map(|elf| {
             elf.split_whitespace()
                 .map(|food| food.parse::<usize>().unwrap())
                 .sum()
         })
-        .collect::<Vec<usize>>()
         .into_iter()
         .max()
         .unwrap()
 }
 fn part2(food_input: &str) -> usize {
-    let mut elves_calories = food_input
+    food_input
         .split("\n\n")
         .collect::<Vec<&str>>()
         .into_iter()
         .map(|elf| {
             elf.split_whitespace()
                 .map(|food| food.parse::<usize>().unwrap())
-                .sum()
+                .sum::<usize>()
         })
-        .collect::<Vec<usize>>();
-
-    elves_calories.sort_by(|l, r| r.cmp(l));
-
-    elves_calories[..3].iter().sum::<usize>()
+        .sorted()
+        .rev()
+        .take(3)
+        .sum()
 }
 
 #[cfg(test)]