Problem:
Score : 200 points

Problem Statement

You are given an integer sequence A of length N.
Find the maximum absolute difference of two elements (with different indices) in A.

Constraints

2 \leq N \leq 100

1 \leq A_i \leq 10^9

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
A_1 A_2 ... A_N

Output

Print the maximum absolute difference of two elements (with different indices) in A.

Sample Input 1

4
1 4 6 3

Sample Output 1

5

The maximum absolute difference of two elements is A_3-A_1=6-1=5.

Sample Input 2

2
1000000000 1

Sample Output 2

999999999

Sample Input 3

5
1 1 1 1 1

Sample Output 3

0

Solution in Rust (1.15.1) (judge verdict: Accepted)

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>().split_whitespace()
        .map(|e| e.parse().ok().unwrap()).collect()
}
use std::cmp;

fn find_min_max(x: &[i64]) -> (i64, i64) {
    let mut min: i64 = x[0];
    let mut max: i64 = x[0];
    let mut x_iter = x.iter();
    while let Some(i) = x_iter.next() {
        min = cmp::min(*i, min);
        max = cmp::max(*i, max);
    }
    return (min, max)
}
fn main() {
    let n:i64 = read();
    let a:Vec<i64> = read_vec();
    let (amin, aMax) = find_min_max(&a);
    println!("{}", aMax-amin);
}