What is binary tree? Explain its uses.
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Does arraylist contain duplicates?
Who invented merge sort?
Which interfaces are implemented by enumset?
Explain Linked List
What is difference between hashset and linkedhashset?
How do you check if a stack is empty or not?
What is array traversing?
Is hashmap sorted?
What do you mean by structure property in a heap?
Differentiate between priorityqueue and treeset.
Can arraylist hold duplicates?
Who invented data structure?