What is dequeue operation?
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What is stack algorithm?
How do you get placements?
Differentiate between hashmap and treemap.
What happens if we put a key object in a hashmap which exists?
What is list and its types?
Who invented merge sort?
Does linked list allow duplicates?
How do you find a string is anagram or not?
Describe stack operation.
What is the Role of push() and pop() method?
How do you sort a collection in descending order?
Stack can be described as a pointer. Explain.