What is data structure and data type?

958

Differentiate between failfast and failsafe.

1174

Can a null element added to a treeset or hashset?

870

What is a treemap used for?

886

What are different types of sorting algorithms?

1000

an array of size N in which every number is between 1 and N, determine if there are any duplicates in it. You are allowed to destroy the array if you like. [ I ended up giving about 4 or 5 different solutions for this, each supposedly better than the others ].

982

What is the slowest sorting algorithm?

907

Does treemap sort on key or value?

889

Describe avl tree or height balanced binary search tree.

897

What is a stable sorting algorithm?

1075

A lot of data structures related programs related to only trees and graphs, like the diameter of a tree, removing the loops in a graph etc.

1034

Explain the term base case?

915

What are the differences between b tree and b+ tree?

915

What is data type and its types?

941

Can we add or delete an element after assigning an array?

1051