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                Given an array of integers, every element appears twice except for one. Find that single one. ``` public class Solution { public int singleNumber(int[] nums) { if(nums.length==1){ return nums[0]; }else if(nums.length%2 == 0){ return 0; }else{ Arrays.sort(nums); int n = nums.length-1; for(int i=0;i<n;i+=2){ if(nums[i] != nums[i+1]){ return nums[i]; } } return nums[n]; } } } ```
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