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Graph Implementation

Understand how to implement directed graphs using adjacency lists in Python. Learn to create a Graph class that uses linked lists for adjacent vertices and methods to add edges and print the graph. This lesson covers fundamental graph construction and traversal techniques essential for coding interviews.

Introduction

At this point, we’ve understood the theoretical concepts of graphs. Our graph will be directed and have no bidirectional edges.

The implementation will be based on the adjacency list model. The linked list class we created earlier will be used to represent adjacent vertices.

As a refresher, here is the illustration of the graph we’ll be producing using an adjacency list:

The Graph Class #

Graph class consists of two data members:

  • The total
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