136_Single_Number

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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public class Solution {
    public int singleNumber(int[] nums) {
        int res = 0;
        for(int num : nums) {
            res ^= num;
        }
        return res;
    }
}