mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-12-26 05:00:15 +00:00
64 lines
1.6 KiB
Python
64 lines
1.6 KiB
Python
# Author: OMKAR PATHAK
|
||
from __future__ import print_function
|
||
|
||
|
||
class Graph():
|
||
def __init__(self):
|
||
self.vertex = {}
|
||
|
||
# for printing the Graph vertexes
|
||
def printGraph(self):
|
||
for i in self.vertex.keys():
|
||
print(i,' -> ', ' -> '.join([str(j) for j in self.vertex[i]]))
|
||
|
||
# for adding the edge beween two vertexes
|
||
def addEdge(self, fromVertex, toVertex):
|
||
# check if vertex is already present,
|
||
if fromVertex in self.vertex.keys():
|
||
self.vertex[fromVertex].append(toVertex)
|
||
else:
|
||
# else make a new vertex
|
||
self.vertex[fromVertex] = [toVertex]
|
||
|
||
def BFS(self, startVertex):
|
||
# Take a list for stoting already visited vertexes
|
||
visited = [False] * len(self.vertex)
|
||
|
||
# create a list to store all the vertexes for BFS
|
||
queue = []
|
||
|
||
# mark the source node as visited and enqueue it
|
||
visited[startVertex] = True
|
||
queue.append(startVertex)
|
||
|
||
while queue:
|
||
startVertex = queue.pop(0)
|
||
print(startVertex, end = ' ')
|
||
|
||
# mark all adjacent nodes as visited and print them
|
||
for i in self.vertex[startVertex]:
|
||
if visited[i] == False:
|
||
queue.append(i)
|
||
visited[i] = True
|
||
|
||
if __name__ == '__main__':
|
||
g = Graph()
|
||
g.addEdge(0, 1)
|
||
g.addEdge(0, 2)
|
||
g.addEdge(1, 2)
|
||
g.addEdge(2, 0)
|
||
g.addEdge(2, 3)
|
||
g.addEdge(3, 3)
|
||
|
||
g.printGraph()
|
||
print('BFS:')
|
||
g.BFS(2)
|
||
|
||
# OUTPUT:
|
||
# 0 -> 1 -> 2
|
||
# 1 -> 2
|
||
# 2 -> 0 -> 3
|
||
# 3 -> 3
|
||
# BFS:
|
||
# 2 0 3 1
|