Which is better hashmap or treemap?
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What is the difference between b tree and binary search tree?
Explain quick sort and merge sort algorithms.
Does arraylist allow null values?
Given an unsorted linked list, and without using a temporary buffer, write a method that will delete any duplicates from the linked list?
A lot of data structures related programs related to only trees and graphs, like the diameter of a tree, removing the loops in a graph etc.
Explain how is linked list implemented?
What is time complexity of quick sort?
What are different techniques for making hash function?
What is application of data structure?
Differentiate between collection and collections.
What is fibonacci search?
In an avl tree, at explain what condition the balancing is to be done?