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+/**%0A * Problem: https://leetcode.com/problems/single-number/%0A */%0A%0Apublic class Solution %7B%0A    public int singleNumber(int%5B%5D nums) %7B%0A        int ret = 0;%0A        for(int x : nums) %7B%0A            ret %5E= x;%0A        %7D%0A        return ret;%0A    %7D%0A%7D%0A

Create Single_Number.java