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 PHP (5.6.30) (judge verdict: Accepted)

<?php
$N = trim(fgets(STDIN));
$A = explode(" ",trim(fgets(STDIN)));
$ans = 0;
for($i = 0;$i<$N;$i++){
  for($j = $i + 1 ;$j<$N;$j++){
  if ($ans<abs($A[$i]-$A[$j])){
  $ans = abs($A[$i]-$A[$j]);
  }
}
}
echo $ans;