HDACM 2523
暴力解决
import java.util.Scanner;
public class Main{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int c = sc.nextInt();
while(c-->){
int n = sc.nextInt();
int k = sc.nextInt();
int x[] = new int[n];
for (int i = ; i < x.length; i++) {
x[i] = sc.nextInt();
}
boolean b[] = new boolean[];
for (int i = ; i < x.length; i++) {
for (int j = i+; j < x.length; j++) {
b[Math.abs(x[j]-x[i])]=true;
}
}
int count = ;
for (int i = ; i < b.length; i++) {
if (b[i]) {
count++;
if (count==k) {
System.out.println(i);
break;
}
}
}
}
sc.close();
}
}