260. Single Number III

解法一：

public class Solution {    public int[] singleNumber(int[] nums) {        int[] copyNum = new int[nums.length];LinkedList<Integer> list = new LinkedList<Integer>();for (int i : nums) {if (list.contains(i)) {list.remove(list.indexOf(i));}else {list.add(i);}}int res[] = new int[2];res[0] = list.pop();res[1] = list.pop();return res;    }}

解法二：