[UVA]10041：Vito's family

Vito's family

Time Limit: 3 sec

Background

The world-known gangster Vito Deadstone is moving to New York. He has a very big family there, all of them living in Lamafia Avenue. Since he will visit all his relatives very often, he is trying to find a house close to them.

Description

Vito wants to minimize the total distance to all of them and has blackmailed you to write a program that solves his problem.

Input

The input consists of several test cases. The first line contains the number of test cases.

For each test case you will be given the integer number of relatives r ( 0 < r < 500) and the street numbers (also integers)   where they live ( 0 < s_i < 30000 ). Note that several relatives could live in the same street number.

Output

For each test case your program must write the minimal sum of distances from the optimal Vito's house to each one of his relatives. The distance between two street numbers s_i and s_j is d_ij= |s_i-s_j|.

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Sample Input	Sample Output
2 2 2 4 3 2 4 6	2 4

import java.util.*;

public class main {
    public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    int test_time = sc.nextInt();   //輸入測試次數

    for (int c=0; c<test_time; c++)
    {
         int[] r = new int[sc.nextInt()];  //輸入親戚數量
         for (int i=0; i<r.length; i++)
         {
               r[i] = sc.nextInt();   //輸入親戚住在哪條街上
         }

         Arrays.sort(r);  //排序( Array.sort() )，將號碼從小排到大
         int m = r[r.length/2];  //找出陣列中點

         int sum=0;
         for (int i=0; i<r.length; i++)
         {
              sum = sum + Math.abs(r[i]-m); // Math.abs絕對值
         }
         System.out.println(sum);
         }
     }
}