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
$N = trim(fgets(STDIN));
$A = explode(' ',trim(fgets(STDIN)));
$max = 0;
$min = 1000000000;

for($i = 0; $i < $N; $i++) {
  if($A["$i"] > $max) {
    $max = $A[$i];
  }
  if($A["$i"] < $min) {
    $min = $A[$i];
  }
}

$ans = $max - $min;
echo "$ans\n";

?>