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(a int) int {
  if a < 0 {
    return -a
  }
  return a
}

func max(a, b int) int {
  if a < b {
    return b
  }
  return a
}

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

  ans := 0
  for i, u := range a {
    for j, v := range a {
      if i != j {
        ans = max(ans, abs(u - v))
      }
    }
  }

  fmt.Println(ans)
}