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 Go (1.6) (judge verdict: Accepted)

package main

import (
	"fmt"
)

func abs(n int) int {
	if n < 0 {
		return n * -1
	}
	return n
}

func main() {
	var n int
	var a []int
	var max, min int
	fmt.Scan(&n)
	for i:=0; i<n; i++ {
		var ia int
		fmt.Scan(&ia)
		a = append(a, ia)
	}

	max, min = a[0], a[0]

	for i:=1; i<n; i++ {
		if max < a[i] {
			max = a[i]
		}
		if min > a[i] {
			min = a[i]
		}
	}

	fmt.Println(abs(max-min))
}