What is comparator interface used for?
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What is the prerequisite for binary searching?
Is it necessary to sort a file before searching a particular item ?
How does a selection sort work?
How null key is handled in hashmap?
Can hashmap have same key?
Can we insert null in set?
What is the maximum total number of nodes in a tree that has N levels? Note that the root is level (zero)
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How do you do a mergesort?
What is a concurrenthashmap?
What are the difference between arraylist and linkedlist from the perspective of sorting?
Give a good data structure for having n queues ( n not fixed) in a finite memory segment. You can have some data-structure separate for each queue. Try to use at least 90% of the memory space.
What are the standard ways in which a graph can be traversed?