复制代码 代码如下:

#_*_coding:utf_8_

import sys

import os

class Graph():

def __init__(self, V, E):

self.V = V

self.E = E

self.visited = []

self.dict = {}

self.fd = open("input.txt")

def initGraph(self):

self.visited = [0 for i in range(self.V+1)]

for i in range(self.E):

f, t = map(int, self.fd.readline().split())

#f, t = map(int, sys.stdin.readline().split())

if self.dict.has_key(f)==False:

l = []

l.append(t)

self.dict[f] = l

else:

l = self.dict[f]

l.append(t)

self.dict[f] = l

def dfsGraph(self, src):

self.visited[src] = 1

print src ,

if self.dict.get(src): #self.dict[src]会出现异常

for u in self.dict[src]:

if self.visited[u]==0:

self.dfsGraph(u)

graph = Graph(6, 10)

graph.initGraph()

graph.dfsGraph(1)

nput.txt

复制代码 代码如下:

1 2

1 3

1 4

3 2

2 6

4 3

3 5

4 5

6 5

3 6

output:

复制代码 代码如下:

1 2 6 5 3 4