Can hashmap store null values?
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What are the difference between a stack and a queue?
Can hashset contain duplicates?
an array of size N in which every number is between 1 and N, determine if there are any duplicates in it. You are allowed to destroy the array if you like. [ I ended up giving about 4 or 5 different solutions for this, each supposedly better than the others ].
What are the applications of b-tree?
Give one example of right rotation.
How can I search for data in a linked list?
Is heap sort faster than quicksort?
What is a simple graph?
What is difference between hashmap and hashtable?
Can you override methods of arraylist?
What does enum do?
What do you mean by data types?