What is top in stack?
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Can arraylist hold duplicates?
why do tree always takes o(log n) time?
Which collection is used for sort?
Why do we use data structures?
Why is hashing used?
Does treemap allow null key?
Why do we need algorithm?
What data structure underlies a python list?
What are stacks? Give some of its applications.
What is circular queue example?
What is binary tree example?
Is treeset thread safe?