Describe full binary tree and complete binary tree.
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Does arraylist have index?
Will hashmap allow null keys?
Parenthesis is never required in postfix or prefix expressions, why?
Differentiate between queue and stack.
What is the idea behind splaying?
What do you mean by collision in hashing?
What is the top of a stack?
What happens if an array goes out-of-bounds?
Is it necessary to sort a file before searching a particular item ?
What is circular queue in data structure?
Which language is best to learn data structures?
When will we get ArrayStoreException?