Can a null element added to a treeset or hashset?
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What is the difference between a hashmap and hashtable?
Define heap?
What do you mean by articulation point?
Why is quicksort so fast?
What is sorting and its types?
What is sorting problem?
What's the difference between a hashtable and a hashmap?
Can we make hashmap synchronized?
Which method will arrange the element of an array in alphabetical order?
What is variable size arrays?and why we use it?
How do you check if a stack is empty or not?
What is max heapify?