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That can be done but it would require storage of the HashMap.
- kmkswamy August 08, 2014When i gave the answer of contains the interviewer asked once u gave me all the common elements in both the lists now give me no similar objects from both the lists.
some thing like A n ( A u B) , ( A u B) n B
the contains solution can handle the same question with a small tweak of removing /flagging the objects in either of the list.