graceful and functional solution of the BOJ problem number 2355

boj2355.rs

use std::io::{self, BufRead};

fn main() {
    io::stdin()
        .lock()
        .lines()
        .filter_map(Result::ok)
        .take(1)
        .for_each(|line| {
            let mut ab = line
                .split(' ')
                .map(|n| n.parse::<i32>())
                .map(|n| n.unwrap())
                .take(2)
                .collect::<Vec<i32>>();

            ab.sort();

            println!(
                "{}",
                (ab[0] ..= ab[1])
                    .into_iter()
                    .sum::<i32>(),
            );
        });
}