Solve Part 2

src/main.rs

@@ -2,15 +2,21 @@
 
 const DATA: &'static str = include_str!("input.txt");
 
+fn parse_calories_per_elf(elf: &str) -> i32 {
+    let mut elf_sum = 0;
+    for food_item in elf.split("\n")
+    {
+        elf_sum += food_item.parse().unwrap_or(0);
+    }
+    elf_sum
+}
+
+#[allow(dead_code)]
 fn part1() {
     let mut highest_sum = 0;
     for elf in DATA.split("\n\n")
     {
-        let mut elf_sum = 0;
-        for food_item in elf.split("\n")
-        {
-            elf_sum += food_item.parse().unwrap_or(0);
-        }
+        let elf_sum = parse_calories_per_elf(elf);
         if elf_sum > highest_sum {
             highest_sum = elf_sum;
         }
@@ -18,7 +24,25 @@ fn part1() {
     println!("The elf carrying the most calories carries {} calories", highest_sum);
 }
 
+fn part2() {
+    let mut elves: Vec<i32> = Vec::new();
+
+    for elf in DATA.split("\n\n")
+    {
+        let elf_sum = parse_calories_per_elf(elf);
+        elves.push(elf_sum);
+    }
+
+    elves.sort();
+
+    // Get the 3 elves carrying more calories
+    let slice = &elves[elves.len()-3 ..];
+
+    println!("The 3 elves carrying the most calories carry {} calories", slice.iter().sum::<i32>());
+}
+
 fn main()
 {
-    part1();
+    //part1();
+    part2();
 }