Problem:
Score: 200 points

Problem Statement

We have N cards. A number a_i is written on the i-th card.

Alice and Bob will play a game using these cards. In this game, Alice and Bob alternately take one card. Alice goes first.

The game ends when all the cards are taken by the two players, and the score of each player is the sum of the numbers written on the cards he/she has taken. When both players take the optimal strategy to maximize their scores, find Alice's score minus Bob's score.

Constraints

N is an integer between 1 and 100 (inclusive).

a_i \ (1 \leq i \leq N) is an integer between 1 and 100 (inclusive).

Input

Input is given from Standard Input in the following format:

N
a_1 a_2 a_3 ... a_N

Output

Print Alice's score minus Bob's score when both players take the optimal strategy to maximize their scores.

Sample Input 1

2
3 1

Sample Output 1

2

First, Alice will take the card with 3. Then, Bob will take the card with 1.
The difference of their scores will be 3 - 1 = 2.

Sample Input 2

3
2 7 4

Sample Output 2

5

First, Alice will take the card with 7. Then, Bob will take the card with 4. Lastly, Alice will take the card with 2. The difference of their scores will be 7 - 4 + 2 = 5. The difference of their scores will be 3 - 1 = 2.

Sample Input 3

4
20 18 2 18

Sample Output 3

18

Solution in C# (Mono 4.6.2.0) (judge verdict: Runtime Error)

using System;
class Program
{
	static void Main()
	{
    int howmany = 0;//差
    int multypleNum = 1;//交互にかける数。
    int[] nums = GetNumbers();
    for(int i = 1; i < nums.Length-1;i++)
    {
     for(int j = i + 1;i < nums.Length;j++)
     {
       if(nums[i] < nums[j])//先頭側が小さい場合
       {
        int swap = nums[j];
         nums[j] = nums[i];
         nums[i] = swap;//数を並び替える
       }
     }
    }
      
      for(int i = 0;i<nums.Length;i++)
      {
        
        howmany += multypleNum * nums[i];
        multypleNum *= -1;//+-の交換
      }
      
      
      
	Console.WriteLine(howmany);//WriteLineをWriteとすると、改行なしで出力。
	}
  
    static int[] GetNumbers()//入力を数字の配列として返す
    {
      int a = int.Parse(Console.ReadLine());//int.Parseは文字列を整数に変換。
	string[] numss = Console.ReadLine().Split(' ');//Splitで区切り文字を指定して複数個受け取る。
      int[] numbers = new int[numss.Length];
for (int i = 0; i < numbers.Length; i++)
  numbers[i] = int.Parse(numss[i]);
      return numbers;
    }
}