valkirilov / dsa-demo-library

A library that contains basic data structures and algorithm implementations.

DSA-Demo-Library

A library that contains basic data structures and algorithm implementations in Java for the purposes of the Data Structure + Algorithms course @ FMI, SU.

Data structure comparison

The following table summarizes what we already know about the algorithmic complexity of the basic operations on several data structures.

Data structure	Get	Append	Insert	RemoveAt	Search	Random Access?
Sequential List (Dynamic Array)	O(1)	O(1)A	O(n)	O(n)	O(n)	True
Linked List	O(n)	O(1)	O(1)	O(1)	O(n)	True
Stack	O(1)	O(1)	-	O(1)	-	False
Queue	O(1)	O(1)	-	O(1)	-	False
HashMap	O(1)	O(1)A	O(1)A	O(1)	O(1)	False

• Subscript _A means that the complexity is amortized.

Standard library implementations

The following table summarizes the standard implementations (if any) of several data structures data structures in the most popular programming languages' standard libraries.

Language	SequentialList	LinkedList	Stack	Queue	HashMap	Set
C++	vector	list	stack	queue	unordered_map	unordered_set
Java	ArrayList	LinkedList	Stack	Queue	HashMap	HashSet
C#	List	LinkedList	Stack	Queue	Dictionary	HashSet
Python	list	-	-	-	dict	set
JavaScript	Array	-	Array	Array	Object	-