What is stack algorithm?
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Parenthesis is never required in postfix or prefix expressions, why?
Does hashmap maintain insertion order?
Differentiate between hashmap and hashtable.
What is the default size of arraylist?
How efficient is bubble sort?
Explain what is a spanning tree?
How does a hashtable work?
Can we extend an array after initialization?
What method removes the value from the top of a stack?
Why you need a data structure?
Define general trees?
Why do we use different types of data structures?