Why do we use collections?
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Define left-in threaded tree?
What is top in stack?
What is advantage and disadvantage of linked list?
What is collections singletonmap?
Does hashmap allow null keys?
What is meant by binary tree?
Can we apply binary search algorithm to a sorted linked list, why?
What do you mean by level of the tree?
What is bubble sort and selection sort?
Explain recursive function & what is the data structures used to perform recursion?
Is null allowed in list?
What is time complexity of bubble sort?