824. Single Number IV
class Solution {
public:
/**
* @param nums: The number array
* @return: Return the single number
*/
int getSingleNumber(vector<int> &nums) {
// Write your code here
int sizeN = nums.size();
if(sizeN == 0){
return -1;
}
int res = nums[0];
for(int i = 1; i < sizeN; i++){
res ^= nums[i];
}
return res;
}
};
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