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path: root/codechef/maxfun.rs
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use std::io::BufRead;

fn main() {
    let stdin = std::io::stdin();
    let mut lines = stdin.lock().lines();
    for _t in 0..lines.next().unwrap().unwrap().trim().parse::<u8>().unwrap() {
        let _n = lines.next().unwrap().unwrap();
        let line = lines.next().unwrap().unwrap();
        let i = line.split(' ').map(|x| x.trim().parse().unwrap());
        let a: Vec<i64> = i.collect();
        println!("{}", (a.iter().max().unwrap() - a.iter().min().unwrap()) * 2);
    }
}