The Observer pattern, is a design pattern from Object Oriented Programming. This pattern is intended to make things easier for us.

Hi, in the third part of my graph series, I want to talk about the search algorithms. We have programmed the graph in Python in the second part. Now it goes to the search algorithms. Each search algorithm will be discussed in separate posts.

Hi, in the fourth part of my graph series, I want to talk about breadth-first search. We have programmed the depth-first search in Python in the third part. Now we will go into the breadth-first search.

Hi, in the second part of the graph series, I want to go into how to build graphs programming-wise. The implementation is in Python and JSON (Javascript Object Notation).

HeapSort is a sorting method that works with the heap data structure. The method works in-place, since no further storage space (e.g. array, vector etc...) must be created here. HeapSort has an overhead of $O(nLog(n))$ in the best case, average case and worst case.

ShellSort is the last sorting algorithm in my sorting series. Shellsort is a sorting method, which works in-place. ShellSort is the extension of or based on InsertionSort.

The Decorator pattern is a design pattern from Object Oriented Programming. It is intended to facilitate an extension of objects. Let's imagine we have a small ordering platform where we sell cars. Where the cars come from doesn't matter. The cars have to be created as objects in our program.

Graphs are data structures that form a kind of network. These come from graph theory and are nothing more than a set of nodes and edges, which are all somehow connected to each other. With graphs many everyday problems can be modeled e.g. city map, navigation systems etc...

BubbleSort is a small sorting method which is quite fast for small amounts of data. BubbleSort works in-place, there is no need to create an extra array. BubbleSort is very naive in that it really compares every element.

SelectionSort is a sorting method, which works in-place, here no new array is created for the sorting. SelectionSort works in bestcase, averagecase and worstcase, with an overhead of $O(n^2)$.