Single Number問題及解法
問題描述：
Given an array of integers, every element appearstwiceexcept for one. Find that single one.
問題分析：
本題可用位運算------異或（相同的數異或為0，任何數與0異或均為0）
過程詳見程式碼：
class Solution { public: int singleNumber(vector<int>& nums) { int res = 0; for(int i = 0;i < nums.size(); i++) { res ^= nums[i]; } return res; } };
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