Differentiate between an array and an arraylist.
What is time complexity of quick sort?
Can a hashmap have duplicate keys?
What is meant by binary tree?
Is it possible to store null key and null values in a hashmap?
Can you store different types in an array?
What is bitonic search?
If you do not initialize an array what will happen?
Can you change size of array once created?
What do you mean by union-by-weight?
What is complete binary tree in data structure?
What is the use of space complexity and time complexity?
Can we add duplicate keys in a hashmap?