How to find the duplicate in an array?
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What are the 4 types of data?
What is the difference between one and two dimensional?
What are the notations used in Evaluation of Arithmetic Expressions using prefix and postfix forms?
What happens if we put a key object in a hashmap which exists?
Does arraylist maintain insertion order?
How does quicksort partition work?
You are given a singly linked list. How would you find out if it contains a loop or not without using temporary space?
Differentiate between file and structure storage structure.
Is arraylist fail fast?
what is Singly Linked list?
What does enum do?
What sort of serious problems have you experienced, and how have you handled them?