Rust Day 1

rust/Cargo.lock

@@ -4,4 +4,4 @@ version = 3
 
 [[package]]
 name = "advent-of-code"
-version = "22.0.2"
+version = "22.1.2"

rust/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "advent-of-code"
-version = "22.0.2"
+version = "22.1.2"
 edition = "2021"
 resolver = "2"
 
@@ -26,3 +26,7 @@ codegen-units = 1
 [[bin]]
 name = "day00"
 path = "src/day00/main.rs"
+
+[[bin]]
+name = "day01"
+path = "src/day01/main.rs"

rust/src/day01/main.rs

@@ -0,0 +1,11 @@
+const INPUT: &str = include_str!("input.txt");
+
+mod part_1;
+use part_1::part_1;
+mod part_2;
+use part_2::part_2;
+
+pub fn main() {
+    part_1(INPUT);
+    part_2(INPUT);
+}

rust/src/day01/part_1.rs

@@ -0,0 +1,17 @@
+pub(crate) fn part_1(input: &'static str) {
+    let maximum = input
+        .split("\n\n")
+        .map(|inventory| {
+            inventory
+                .split('\n')
+                .map(|item| {
+                    item.parse::<u32>()
+                        .expect("Input isn't clean. Non-number found")
+                })
+                .sum::<u32>()
+        })
+        .max()
+        .expect("No highest inventory found. Input unclean?");
+
+    println!("Part 1: {maximum}")
+}

rust/src/day01/part_2.rs

@@ -0,0 +1,19 @@
+pub(crate) fn part_2(input: &'static str) {
+    let mut calories = input
+        .split("\n\n")
+        .map(|inventory| {
+            inventory
+                .split('\n')
+                .map(|item| {
+                    item.parse::<u32>()
+                        .expect("Input isn't clean. Non-number found")
+                })
+                .sum::<u32>()
+        })
+        .collect::<Vec<_>>();
+    calories.sort();
+    calories.reverse();
+    let top_three = calories.iter().take(3).sum::<u32>();
+
+    println!("Part 2: {top_three}");
+}