day 1

day1/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day1"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day1/sample_input.txt

@@ -0,0 +1,14 @@
+1000
+2000
+3000
+
+4000
+
+5000
+6000
+
+7000
+8000
+9000
+
+10000

day1/src/main.rs

@@ -0,0 +1,24 @@
+fn main() {
+    const INPUT: &str = include_str!("../input.txt");
+
+    let split = INPUT.split("\n");
+    let mut calories: Vec<u64> = Vec::new();
+
+    let mut running_total: u64 = 0;
+    for s in split {
+        if s == "" {
+            calories.push(running_total);
+            running_total = 0;
+        } else {
+            running_total += s.trim().parse::<u64>().expect("Invalid input line: {s}!");
+        }
+    }
+
+    let max_calories = calories.iter().max().unwrap();
+
+    println!("Max calories: {max_calories}");
+
+    calories.sort_by(|a, b| b.cmp(a));
+    let top_three = calories[0] + calories[1] + calories[2];
+    println!("Sum of top 3: {top_three}");
+}