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package leetcode;

import java.util.*;

public class leetcode719 {

/*

* 超出空间限制

* */

ArrayList<Integer> list=new ArrayList<>();

LinkedList<Integer> num=new LinkedList<>();

public int smallestDistancePair(int[] nums, int k) {

//if (nums.length==0||k<=0) return 0;

helper(nums,0,nums.length-1,2);

Collections.sort(list);

return list.get(k-1).intValue();

}

public void helper(int [] nums,int start,int end,int n){

if (n==0){

list.add(Math.abs(num.get(0)-num.get(1)));

return;

}

for (int i = start; i <=end; i++) {

num.addLast(nums[i]);

helper(nums,i+1,end,n-1);

num.removeLast();

}

}

public static void main(String[] args) {

new leetcode719().smallestDistancePair(new int[]{

1,3,1

},1);

}

}