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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class Main {
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line = br.readLine();
        int number = Integer.parseInt(line);
        String[] in = br.readLine().split(" ");
        ArrayList<Integer> coordinate = new ArrayList<Integer>(); 
        int max = 0;
        int min = 1000;
        
        for(int i = 0; i < in.length; i++) {
            coordinate.add(Integer.parseInt(in[i]));
        }
        for(int j = 0; j < coordinate.size(); j++) {
            if(min > coordinate.get(j)) {
                min = coordinate.get(j);
            }
            if(max < coordinate.get(j)) {
                max = coordinate.get(j);
            }
        }
        System.out.println(max - min);
    }
}