What is the difference between a push and a pop?
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What is array and its types?
How can you add an item to the beginning of the list?
Why do we use data structures?
how to add an item to the beginning of the list?
What is time complexity of arrays sort?
How do you explain bubble sort?
What are skew trees? For a tree with 4 nodes draw all possible binary? Generalize for n nodes how many binary trees can be drawn?
Define a right-skewed binary tree?
Define splay tree?
If you have to store one lakh objects, what will be a better option- a hash map or an array list?
Which is better hashset or treeset?
What is an ordered list?