136. Single Number leetcode做题报告
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?
class Solution {
public:
int singleNumber(vector<int>& nums) {
for(int i=1;i<nums.size();i++){
nums[0]^=nums[i];
}
return nums[0];
}
};
要求O（n）并且不用额外的变量。非常巧妙的技巧。相同数取异或为0，所0和所有数的异或为本身，所以最后剩下的就是SingleNumber。
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