What is data structure explain in detail?
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Does arraylist maintain insertion order?
What is the time complexity of arraylist and linked list?
Check if duplicates exist in an array of N which has range 1 to N.
What exactly is a thread?
Differentiate between file and structure storage structure.
What are the basic data structures?
Is hashset thread safe?
Why is sorting necessary?
What are all the classes and interfaces that are available in the collections?
Write the recursive c function to count the number of nodes present in a binary tree.
Can value be null in treemap?
Give the example of validating the parenthesis of expression using stack.