Compare arraylist contents and get the duplicate

Question

Anonimo · Accepted Answer

Gave the approach. But he was not happy as he said if arraylist consists of 1000's of elements, it is difficult and slow in my approach.  I think he needs search algorithms comparison and so on

Ashish · Answer

In case of such large lists, better way is to sort one of the list and perform binary search  of elements in list 2.

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