mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-30 16:31:08 +00:00
66 lines
1.6 KiB
Python
66 lines
1.6 KiB
Python
#!/usr/bin/python
|
||
|
||
""" Author: OMKAR PATHAK """
|
||
|
||
|
||
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
|