if(numbers.length==0)
        {
            duplication[0] = -1;
            return false;
        }
        boolean[] b = new boolean[numbers.length];
        for(int i=0;i<b.length;i++)
        {
            b[i] = false;
        }
        for(int i=0;i<numbers.length;i++)
        {
            if(b[numbers[i]])
            {
                duplication[0] = numbers[i];
                return true;
            }
            else
            {
                b[numbers[i]] = true;
            }
        }
        return false;