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136. Single Number | 找出那个只出现一次的数

2017-02-11 15:06 211 查看
Given an array of integers, every element appears twice except for one. Find that single one.Note:Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory?思路:将数组的数依次异或操作,获得的结果就是要找的数。public class Solution {public int singleNumber(int[] nums) {int t = 0;if (nums.length == 1) {return nums[0];}t = nums[0] ^ nums[1];for (int i = 2; i < nums.length; i++) {t = t ^ nums[i];}return t;}}

                                            
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