LEETCODE Find the duplicate number

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 class Solution {

    public int findDuplicate(int[] nums) {

        HashSet<Integer> aa=new HashSet<Integer>();

        int m=0;

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

            if(aa.contains(nums[i])){

                m=nums[i];

                System.out.println(nums[i]);

            }

            else

                aa.add(nums[i]);

        }

        return m;

    }

    

    

}

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