Is hashmap get thread safe?
Why is quicksort not stable?
Differentiate between collection and collections.
What is a queue in data structure?
What are the parts of root node?
Briefly explain recursive algorithm?
Suppose in an integer array, there is 1 to 100 number, out of one is duplicate, how to find?
How can you implement a stack?
What do you mean by an Array?
an array t[100] which contains numbers between 1..99. Return the duplicated value. Try both O(n) and O(n-square).
What is the basic of data structure?
What is a directed graph?
Does map extend iterable?