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?
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class Solution {
public:
int singleNumber(vector<int>& nums) {
int len=nums.size();
int res = 0;
for(int i=0; i<len; i++)
{
res = res^nums[i];
}
return res;
}
};