How to get top two numbers from an array?
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How do you sort an array in decreasing order?
Is learning data structures necessary?
What is meant by heap sort?
What do you mean by general trees?
What is a threaded binary tree? Explain its operation with example?
Is treeset sorted?
Can hashtable have duplicate values?
There is a program which inserts and deletes node in a sorted singly linked list. There is a bug in one of the modules, how would you debug it?
Explain the internal working of a hash map?
Explain the difference between hashset and hashmap?
What are the types of linked list?
What is comparable interface?