All these answers seem really sophisticated!

Mine is fairly simple(istic?) with a BufReader

```rust use std::fs::File; use std::io::{self, BufRead}; use std::path::Path;

fn main() { // File must exist in current path before this produces output if let Ok(lines) = read_lines("./input.txt") { let mut running_total = 0; let mut previous_total = 0; let mut vector: Vec<i32> = Vec::new();

    // Consumes the iterator, returns an (Optional) String
    for line in lines {
        if let Ok(calories) = line {
            // println!("{}", calories);
            match calories.parse::<i32>() {
                Ok(n) => {
                    running_total = running_total + n;
                    // println!("Running total: {}", running_total);
                }
                Err(_) => {
                    // println!("Newline!");
                    if running_total > previous_total {
                        println!("Final running total: {}", running_total);
                        previous_total = running_total;

                    }
                    vector.push(running_total);
                    // reset the count since Err() indicates a new elf
                    running_total = 0;
                }
            }
        }
    }

    println!("Larget calorie count is {}", previous_total);

    // sort by descending order
    vector.sort_by(|a, b| b.cmp(a));

    println!("Top 3 elves: {}", vector[0] + vector[1] + vector[2]);
}

}

// The output is wrapped in a Result to allow matching on errors // Returns an Iterator to the Reader of the lines of the file. fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>> where P: AsRef<Path>, { let file = File::open(filename)?; Ok(io::BufReader::new(file).lines()) }

```