LeetCode 0136 - Single Number

Single Number

Desicription

Given a non-empty 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?

Example 1:

代码语言：javascript复制

Input: [2,2,1]
Output: 1

Example 2:

代码语言：javascript复制

Input: [4,1,2,1,2]
Output: 4

Solution

代码语言：javascript复制

class Solution {
public:
    int singleNumber(vector<int>& nums) {
        int res = 0;
        for(auto it : nums)
            res ^= it;
        return res;
    }
};

algorithm element memory runtime using

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