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落单的数
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落单的数
Table of Contents
- 1. 题目
- 2. 挑战
- 3. 思路
1 题目
给出2*n + 1 个的数字，除其中一个数字之外其他每个数字均出现两次，找到这个数字。
2 挑战
循环一次，常数的空间消耗
3 思路
如果没有循环次数限制和常数的空间消耗限制，这个问题很简单。用一个数组来记录数字出现的次数，再找出一次的数字就可以了。
但是用常数的空间消耗，确实没有想到好方法，后来在网上搜到的方法。用亦或来做，真是聪明！
public class Solution { /** *@param A : an integer array *return : a integer */ public int singleNumber(int[] A) { // Write your code here int result = 0; for(int a: A) { result ^= a; } return result; } }
Date: 2016-12-31 17:00
Created: 2016-12-31 周六 17:21
Validate
落单的数
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