Can we null keys in treemap?
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What is the height of an empty tree?
What is peek in stack?
Have you ever used HashTable and Directory?
If I try to add enum constants to a treeset, what sorting order will it use?
what are the applications that use Linked lists?
How can we remove loops in a linked list? What are the functions of fast and slow pointers?
What is the difference between hashmap and arraylist?
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 ].
Which is the parent class of hashmap class?
What sort of serious problems have you experienced, and how have you handled them?
What does a treemap do?
How do you use merge sort?