mathdatech/Python
1
0
Fork 0
mirror of https://github.com/TheAlgorithms/Python.git synced 2025-03-13 18:19:47 +00:00
Code Issues Packages Projects Releases Wiki Activity

Corrected the Breadth First Search Implementation

Browse Source
This commit is contained in:
rudrasohan 2017-09-11 15:27:50 +05:30
parent 1bed547226
commit f029b366e2
1 changed files with 14 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
Graphs/Breadth_First_Search.py
View File

@ -1,70 +1,43 @@
class GRAPH: class GRAPH:
"""docstring for GRAPH""" """docstring for GRAPH"""
def __init__(self, nodes): def __init__(self, nodes):
self.nodes=nodes self.nodes=nodes
self.graph=[[0]*nodes for i in range (nodes)] self.graph=[[0]*nodes for i in range (nodes)]
self.visited=[0]*nodes self.visited=[0]*nodes
self.vertex = nodes
def show(self):
for i in self.graph:
for j in i:
print(j, end=' ')
print(' ')
def bfs(self,v): def bfs(self,v):
visited = [False]*self.vertex visited = [False]*self.vertex
visited[v - 1] = True visited[v] = True
print('%d visited' % (v)) queue = [v]
queue = [v - 1]
while len(queue) > 0: while len(queue) > 0:
v = queue[0] v = queue[0]
print('%d,' %v,end='')
queue.pop(0)
for u in range(self.vertex): for u in range(self.vertex):
if self.graph[v][u] == 1: if self.graph[v][u] == 1:
if visited[u]== False: if visited[u]== False:
visited[u] = True visited[u] = True
queue.append(u) queue.append(u)
print('%d visited' % (u +1))
queue.pop(0)
g = Graph(10)
g.add_edge(1,2)
g.add_edge(1,3)
g.add_edge(1,4)
g.add_edge(2,5)
g.add_edge(3,6)
g.add_edge(3,7)
g.add_edge(4,8)
g.add_edge(5,9)
g.add_edge(6,10)
g.bfs(4)
=======
print self.graph
def add_edge(self, i, j): def add_edge(self, i, j):
self.graph[i][j]=1 self.graph[i][j]=1
self.graph[j][i]=1
def bfs(self,s):
queue=[s]
self.visited[s]=1
while len(queue)!=0:
x=queue.pop(0)
print(x)
for i in range(0,self.nodes):
if self.graph[x][i]==1 and self.visited[i]==0:
queue.append(i)
self.visited[i]=1
n=int(input("Enter the number of Nodes : ")) n=int(input("Enter the number of Nodes : "))
g=GRAPH(n) g=GRAPH(n)
g.vertex = n
e=int(input("Enter the no of edges : ")) e=int(input("Enter the no of edges : "))
print("Enter the edges (u v)") print("Enter the edges (u v)")
for i in range(0,e): for i in range(0,e):
u,v=map(int, raw_input().split()) u,v=map(int,input().split())
g.add_edge(u,v) g.add_edge(u,v)
s=int(input("Enter the source node :")) s=int(input("Enter the source node : "))
print("BFS order:")
g.bfs(s) g.bfs(s)
print("")