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Single Number II

题目:

Given an array of integers, every element appears three times except for one. Find that single one.

Note:
Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory?

我的解法:

(1)算法思想:

本题是Single Number 的升级版(见博文《Single Number》)。先用快排算法将数组排序,然后遍历一次数组即可:对于i,如果A[i]=A[i+1],则将i加上3,否则返回A[i].

(2)代码如下:

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Single Number II