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 PHP7 (7.0.15) (judge verdict: Accepted)

<?php

	fscanf(STDIN, "%d",$n);
	$array = explode(" ",trim(fgets(STDIN)));
	
	for($i=0;$i<$n;$i++){
		if($i==0){
			$Amax = $array[$i];
		}elseif($Amax < $array[$i]){
			$Amax  = $array[$i];
		}
	}

	for($i=0;$i<$n;$i++){
		if($i==0){
			$Amin = $array[$i];
		}elseif($Amin > $array[$i]){
			$Amin  = $array[$i];
		}
	}
			
	echo $Amax - $Amin;
	
?>