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Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 9309    Accepted Submission(s): 2959


Problem Description
给你N个整数,x1,x2...xn，任取两个整数组合得到|xi-xj|,(0<i,j<=N,i!=j)。
现在请你计算第K大的组合数是哪个（一个组合数为第K大是指有K-1个不同的组合数小于它）。
 

Input
输入数据首先包含一个正整数C，表示包含C组测试用例.
每组测试数据的第一行包含两个整数N，K。(1<N<=1000,0<K<=2000)
接下去一行包含N个整数，代表x1,x2..xn。(0<=xi<=2000)
 

Output
对于每组测试数据，请输出第K大的组合数，每个输出实例占一行。
 

Sample Input
3
3 2
4 0 7
4 2
1 2 3 4
2 1
2 9
 

Sample Output
4
2
7
 

Source
HDU 2008-10 Programming Contest
 

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