Problem:
Score : 200 points

Problem Statement

It is only six months until Christmas, and AtCoDeer the reindeer is now planning his travel to deliver gifts.

There are N houses along TopCoDeer street. The i-th house is located at coordinate a_i. He has decided to deliver gifts to all these houses.

Find the minimum distance to be traveled when AtCoDeer can start and end his travel at any positions.

Constraints

1 ≤ N ≤ 100

0 ≤ a_i ≤ 1000

a_i is an integer.

Input

Input is given from Standard Input in the following format:

N
a_1 a_2 ... a_N

Output

Print the minimum distance to be traveled.

Sample Input 1

4
2 3 7 9

Sample Output 1

7

The travel distance of 7 can be achieved by starting at coordinate 9 and traveling straight to coordinate 2.

It is not possible to do with a travel distance of less than 7, and thus 7 is the minimum distance to be traveled.

Sample Input 2

8
3 1 4 1 5 9 2 6

Sample Output 2

8

There may be more than one house at a position.

Solution in Rust (1.15.1) (judge verdict: Runtime Error)

fn main() {
    let n:usize = io::readln();
    let a:Vec<i32> = (0..n).map(|_| io::readln()).collect();
    println!("{}", a.iter().max().unwrap() - a.iter().min().unwrap())
}

pub mod io {
    use std::io;

    pub fn read_line() -> String {
        let mut s = String::new();
        io::stdin().read_line(&mut s).unwrap();
        s.trim_right().to_owned()
    }

    pub fn readln<T: Read>() -> T {
        let mut s = String::new();
        io::stdin().read_line(&mut s).unwrap();
        T::read(s.trim())
    }

    pub trait Read {
        fn read(s: &str) -> Self;
    }

    impl Read for String {
        fn read(s: &str) -> Self {
            s.to_string()
        }
    }

    impl<T: Read> Read for Vec<T> {
        fn read(s: &str) -> Self {
            s.split_whitespace().map(|w| T::read(w)).collect()
        }
    }

    macro_rules !def_read {
        ($t : ty) => {
            impl Read for $t {
                fn read(s : &str)->$t { s.parse().unwrap() }
            }
        }
    }

    macro_rules !def_read_tuple {
        ($($t : ident), *) => {
            impl<$($t : Read + Default), *> Read for ($($t), *) {
                fn read(s : &str)->Self {
                    let mut iter = s.split_whitespace();
                    ($($t::read(iter.next().unwrap())), *)
                }
            }
        };
    }

    def_read!(i32);
    def_read!(i64);
    def_read!(isize);
    def_read!(usize);
    def_read!(f32);
    def_read!(f64);
    def_read_tuple!(T0, T1);
    def_read_tuple!(T0, T1, T2);
    def_read_tuple!(T0, T1, T2, T3);
    def_read_tuple!(T0, T1, T2, T3, T4);
}