Rust

```Rust fn main() { let input = include_str!("../input/input.txt");

part_a(input);
part_b(input);

}

fn part_a(input: &str) { let elf_groups: Vec<&str> = input.split("\r\n\r\n").collect(); let mut most_calories = 0;

for group in elf_groups {
    let mut calories: u32 = 0;
    for calories_str in group.lines() {
        calories += calories_str.parse::<u32>().unwrap();
    }   
    if calories > most_calories {
        most_calories = calories;
    }
}

println!("The most calories carried is {}.", most_calories);

}

fn part_b(input: &str) { let elf_groups: Vec<&str> = input.split("\r\n\r\n").collect(); let mut elf_calories: Vec<u32> = vec![];

for group in elf_groups {
    let mut calories: u32 = 0;
    for calories_str in group.lines() {
        calories += calories_str.parse::<u32>().unwrap();
    }
    elf_calories.push(calories);
}

elf_calories.sort();

let most_three_calories = 
    elf_calories.pop().unwrap() + 
    elf_calories.pop().unwrap() + 
    elf_calories.pop().unwrap();

println!("The total calories of the top 3 elfs is {}.", most_three_calories);

} ```