Itertools for smaller code

day2/Cargo.lock

@@ -41,8 +41,15 @@ name = "day2"
 version = "0.1.0"
 dependencies = [
  "clap",
+ "itertools",
 ]
 
+[[package]]
+name = "either"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90e5c1c8368803113bf0c9584fc495a58b86dc8a29edbf8fe877d21d9507e797"
+
 [[package]]
 name = "errno"
 version = "0.2.8"
@@ -95,6 +102,15 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0fd2260e829bddf4cb6ea802289de2f86d6a7a690192fbe91b3f46e0f2c8473"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.138"

day2/Cargo.toml

@@ -7,3 +7,4 @@ edition = "2021"
 
 [dependencies]
 clap = "4.0.29"
+itertools = "0.10.5"

day2/src/main.rs

@@ -6,6 +6,8 @@ use std::io::Lines;
 use clap::Arg;
 use clap::Command;
 
+use itertools::Itertools;
+
 struct Accumulator<B> {
     lines: Lines<B>,
     current: u32,
@@ -52,7 +54,12 @@ fn main() {
     let file = File::open(filename).expect("Can't read file");
     let reader = BufReader::new(file);
 
-    let mut calories = reader.lines().elf().collect::<Vec<u32>>();
-    calories.sort_by(|a, b| b.cmp(a));
-    println!("Sum: {:?}", calories.iter().take(3).sum::<u32>())
+    let calories = reader
+        .lines()
+        .elf()
+        .sorted_by(|a, b| b.cmp(a))
+        .take(3)
+        .sum::<u32>();
+
+    println!("Sum: {:?}", calories)
 }