Define parent node?
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Why is null not allowed in concurrenthashmap?
Differentiate between hashmap and hashtable.
Which is faster quick sort or merge sort?
What are the parts of a linked list?
List the differences between comparable and comparator interface?
How do you implement a stack?
What is the best complexity of bubble sort?
What is meant by linked list?
Check if duplicates exist in an array of N which has range 1 to N.
Parenthesis are never needed in prefix or postfix expressions. Why?
Describe queue operation.
What is time complexity of hashmap?