287 寻找重复数

287 寻找重复数

class Solution {
    public int findDuplicate(int[] nums) {
        if (nums == null || nums.length <= 1)
            return -1;
        Arrays.sort(nums);
        for (int i = 0; i < nums.length - 1; i++) {
            if (nums[i] == nums[i + 1])
                return nums[i];
        }
        return -1;
    }
}