public int singleNumber(int[] nums) {
Arrays.sort(nums);
for (int i = 0; i < (nums.length - 1); i++) {
if ((i == 0 && nums[i + 1] != nums[i])
|| (nums[i + 1] != nums[i] && nums[i] != nums[i - 1])){
return nums[i];
}
}
return nums[nums.length - 1];
}
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