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import java.util.*;

/**

* Created by ygz on 2016/10/9.

* My email : gzyang1125@foxmail.com

*/

public class SingleNumber {

public int singleNumber(int[] nums) {

Set<Integer> set = new HashSet<Integer>();

for (int i=0;i<nums.length;i++){

if (set.contains(nums[i])){

set.remove(nums[i]);

}else{

set.add(nums[i]);

}

}

Iterator<Integer> it = set.iterator();

return it.next();

}

//大牛的操作

public int singleNumber1(int[] nums) {

int res = 0;

for (int i=0;i<nums.length;i++){

res ^= nums[i];

}

return res;

}

}