Define union-by-weight?
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Is array faster than arraylist?
What is a treeset?
What is entryset method in map?
What is time complexity of hashmap?
Which is faster arraylist or hashmap?
Can hashset contain duplicates?
In what scenario, binary search can be used?
Differentiate between queue and deque.
Which interfaces are implemented by linkedlist?
Why is quicksort faster than merge sort?
What is array in data structure with example?
Provide an algorithm to reverse a linked list without using recursion.