[Python爬虫] 之三十:Selenium +phantomjs 利用 pyquery抓取栏目
一、介绍
本例子用Selenium +phantomjs爬取栏目(http://tv.cctv.com/lm/)的信息
二、网站信息
三、数据抓取
首先抓取所有要抓取网页链接,共39页,保存到数据库里面
def getUrls(self):
urls = []
urls.append('http://tv.cctv.com/lm/')
for index in range(2,40):
urls.append("javascript:window.scroll(0,145);DataInteraction({0});showPageTitle_fenyei2('ELMT1413526954890942',{0});".format(index))
self.db.SaveCCTVColumnUrls(urls,'')
针对上面的网站信息,来进行抓取
1、首先抓取信息列表
抓取代码:Elements = doc("div[id='text_box_0']").find('dl').find('dd')
2、栏目名称,链接
column1Element = element.find('div[class="text"]').find('h3').find('a')
columnName = column1Element.text().encode('utf8').replace(',', ',').replace('\n', '')
columnUrl = column1Element.attr('href')
四,实现代码
# coding=utf-8
import os
import re
from selenium import webdriver
from selenium.common.exceptions import TimeoutException
from datetime import datetime,timedelta
import selenium.webdriver.support.ui as ui
import time
from pyquery import PyQuery as pq
import columnData
import mongoDB
class cctvColumnInfo: def __init__(self):
#通过配置文件获取IEDriverServer.exe路径
# self.urls = self.getUrls()
# IEDriverServer ='C:\Program Files\Internet Explorer\IEDriverServer.exe'
# self.driver = webdriver.Ie(IEDriverServer)
# self.driver.maximize_window()
self.driver = webdriver.PhantomJS(service_args=['--load-images=false'])#service_args=['--load-images=false']
self.driver.set_page_load_timeout(10)
self.driver.maximize_window()
self.db = mongoDB.mongoDbBase() def WriteUrl(self,url):
fileName = os.path.join(os.getcwd(), 'cctvColumn/cctvColumn_url.txt')
with open(fileName, 'a') as f:
f.write('\n'+url) def getUrls(self):
urls = []
urls.append('http://tv.cctv.com/lm/')
for index in range(2,40):
urls.append("javascript:window.scroll(0,145);DataInteraction({0});showPageTitle_fenyei2('ELMT1413526954890942',{0});".format(index))
self.db.SaveCCTVColumnUrls(urls,'')
# return urls def WriteLog(self, message,date):
fileName = os.path.join(os.getcwd(), 'cctvColumn/cctvColumn-'+date + '.txt')
with open(fileName, 'a') as f:
f.write(message) def getColumnInfo(self, colInfo):
ts = colInfo.split('主持人')
firstBroadcastTime = ts[0]
ts1 = ts[1].split('播出频道')
columnHost = '主持人' + ts1[0]
broadcastChannel = '播出频道' + ts1[1]
return firstBroadcastTime, columnHost, broadcastChannel def CatchData(self): urlIndex = 0
urls = self.db.GetCCTVColumnUrls()
itemIndex = 0
for u in urls:
url = u['url']
try:
if url == 'http://tv.cctv.com/lm/':
self.driver.get(url)
else:
self.driver.execute_script(url)
urlIndex += 1
time.sleep(2)
selenium_html = self.driver.execute_script("return document.documentElement.outerHTML")
doc = pq(selenium_html)
# Elements = doc("div[@id='text_box_0']/dl/dd")
Elements = doc("div[id='text_box_0']").find('dl').find('dd')
message = '' # for element in Elements:
column_name = url.encode('utf8')
print url
for element in Elements.items():
colobj = columnData.columnData()
itemIndex+=1
firstBroadcastTime = ''
ReplayBroadcastTime = ''
firstBroadcastChannel = ''
# column1Element = element.find('div[@class="text"]/h3/a')
# column1Element = element.find_element_by_xpath("//div[@class='ui-page-next']")
column1Element = element.find('div[class="text"]').find('h3').find('a')
columnName = column1Element.text().encode('utf8').replace(',', ',').replace('\n', '')
columnUrl = column1Element.attr('href') colobj.setColumnName(columnName)
colobj.setColumnUrl(columnUrl)
column_name += '\n' + columnName
# time.sleep(3)
print columnName # column2Element = element.find('div[@class="text"]/p/a')
column2Element = element.find('div[class="text"]').find('p').find('a')
columnTimeName = column2Element.text().encode('utf8').replace(',', ',').replace('\n', '')
columnTimeUrl = column2Element.attr('href')
colobj.setColumnTimeName(columnTimeName)
colobj.setColumnTimeUrl(columnTimeUrl)
# print columnTimeName + '; ' + columnTimeUrl # column34Elements = element.find('div[@class="text"]/span/a')
column34Elements = element.find('div[class="text"]').find('span').find('a') # for column34Element in column34Elements:
column34Index = 0
pastVideoUrl = ''
officialWebsiteUrl = ''
for column34Element in column34Elements.items():
if column34Index == 0:
pastVideoUrl = column34Element.attr('href')
colobj.setPastVideoUrl(pastVideoUrl)
else:
officialWebsiteUrl = column34Element.attr('href')
colobj.setOfficialWebsiteUrl(officialWebsiteUrl)
column34Index += 1 # columnImageElement = element.find('div[@class="img"]/a/img')
columnImageElement = element.find('div[class="img"]').find('a').find('img')
colImgUrl = columnImageElement.attr('src') if colImgUrl == None:
columnImageElement = element.find('div[class="image"]').find('a').find('img')
colImgUrl = columnImageElement.attr('src')
# print colImgUrl
colobj.setColImgUrl(colImgUrl)
# 首播时间
firstBroadcastTime1 = ''
# 主持人
columnHost = ''
# 播出频道
firstBroadcastChannel1 =''
# columnInfos = element.find('div[@class="lr"]/div')
columnInfos = element.find('div[class="lr"]').find('div')
if columnInfos:
for colInfo in columnInfos.items():
firstBroadcastTime1, columnHost, firstBroadcastChannel1 = self.getColumnInfo(
colInfo.text().encode('utf8').replace(',', ',').replace('\n', ''))
columnHost = columnHost.replace(',', ',')
if not firstBroadcastTime:
firstBroadcastTime = firstBroadcastTime1
if not firstBroadcastChannel:
firstBroadcastChannel = firstBroadcastChannel1
colobj.setColumnHost(columnHost)
colobj.setFirstBroadcastChannel(firstBroadcastChannel1)
colobj.setFirstBroadcastTime(firstBroadcastTime1)
# 栏目名称,首播时间,重播时间,播出频道,主持人,栏目url,栏目名称1(带时间的),栏目名称1url,往期视频url,栏目官网url,),栏目对应图片url
mess = '\n{0},{1},{2},{3},{4},{5},{6},{7},{8},{9},{10}'.format(columnName, firstBroadcastTime,
ReplayBroadcastTime,
firstBroadcastChannel, columnHost,
columnUrl, columnTimeName,
columnTimeUrl, pastVideoUrl,
officialWebsiteUrl, colImgUrl) # print mess
message += mess self.db.SaveCCTVColumnData(colobj,itemIndex)
self.db.SaveCCTVColumnUrl(columnUrl, '', columnName) date = time.strftime('%Y-%m-%d')
self.WriteLog(message, date)
self.WriteUrl(column_name)
self.db.SetCCTVColumnUrlCrawlState(url)
except TimeoutException,e:
print 'timeout url: '+url self.driver.close()
self.driver.quit() def getBroadCast(self):
urls = self.db.GetSubCCTVColumnUrls() for u in urls:
firstBroadcastTime = ''
ReplayBroadcastTime = ''
firstBroadcastChannel = ''
messsage = ''
url = u['url']
# url='http://tv.cctv.com/lm/xqds'
# url='http://tv.cctv.com/lm/24xiaoshi/'
columnName = u['columnName'] # u'http://tv.cctv.com/lm/kanjian'
try:
self.driver.get(url)
time.sleep(2)
selenium_html = self.driver.execute_script("return document.documentElement.outerHTML")
doc = pq(selenium_html)
Elements = doc("p[class='p_1']") index = 0
for element in Elements.items():
if index == 0:
firstBroadcastTime = element.text().encode('utf8').replace(',', ',').replace('\n', '')
elif index == 1:
ReplayBroadcastTime = element.text().encode('utf8').replace(',', ',').replace('\n', '')
elif index == 2:
firstBroadcastChannel = element.text().encode('utf8').replace(',', ',').replace('\n', '')
break
index += 1
if index == 0:
Elements = doc("div[class='head_msg']").find('table').find('tbody').find('tr') for element in Elements.items():
messsage+=element.text().encode('utf8').replace(',', ',').replace('\n', '') if messsage:
firstBroadcastTime, ReplayBroadcastTime, firstBroadcastChannel= self.getBroadInfo(columnName.encode('utf8'),messsage)
self.db.SetCCTVColumnUrlCrawlState(url) if firstBroadcastChannel:
colobj = columnData.columnData()
colobj.setColumnName(columnName)
colobj.setFirstBroadcastTime(firstBroadcastTime)
colobj.setFirstBroadcastChannel(firstBroadcastChannel)
colobj.setReplayBroadcastTime(ReplayBroadcastTime)
self.db.UpdateCCTVColumnData(colobj)
print '\n'
print url
print columnName
print firstBroadcastTime
print firstBroadcastChannel
print ReplayBroadcastTime except TimeoutException, e:
print 'TimeoutException:'+url def getBroadInfo(self,columnName,column):
# column ='首播频道: CCTV-14首播时间: 周三17:15'
firstBroadcastTime = ''
ReplayBroadcastTime = ''
firstBroadcastChannel = ''
column=column.replace('栏目大全','')
if '>>' in column:
index = column.index('>>')
column = column[0:index] if 'CCTV13' in column:
column = column.replace('CCTV13', 'CCTV-13')
if 'CCTV6' in column:
column = column.replace('CCTV6', 'CCTV-6')
if 'CCTV1' in column:
column = column.replace('CCTV1','CCTV-1') if '官方微信' in column:
index = column.index('官方微信')
column = column[0:index] # if '停播' in column or '关闭' in column:
# return firstBroadcastTime, ReplayBroadcastTime, firstBroadcastChannel
# elif '>>' in column:
# index = column.index('>>')
# column = column[0:index] if '首播时间' in column:
if '重播时间' in column:
cols = column.split('重播时间')
firstBroadcastTime = cols[0]
if '独播频道' in cols[1]:
ReplayBroadcastTime = '重播时间' + cols[1].split('独播频道')[0]
firstBroadcastChannel = '独播频道' + cols[1].split('独播频道')[1]
elif '首播频道' in cols[1]:
ReplayBroadcastTime = '重播时间' + cols[1].split('首播频道')[0]
firstBroadcastChannel = '首播频道' + cols[1].split('首播频道')[1] elif '播出频道' in cols[1]:
ReplayBroadcastTime = '重播时间' + cols[1].split('播出频道')[0]
firstBroadcastChannel = '播出频道' + cols[1].split('播出频道')[1]
elif '独播频道' in column:
cols = column.split('独播频道')
firstBroadcastTime = cols[0]
firstBroadcastChannel = '独播频道' + cols[1]
elif '播出频道' in column:
cols = column.split('播出频道')
firstBroadcastTime = cols[0]
firstBroadcastChannel = '播出频道' + cols[1] elif '首播频道' in column:
cols = column.split('首播频道')
index = column.index('首播频道')
if index==0:
cols = column.split('首播时间')
firstBroadcastChannel = cols[0]
firstBroadcastTime = '首播时间' + cols[1]
else:
firstBroadcastTime = cols[0]
firstBroadcastChannel = '首播频道' + cols[1]
else:
if '首播(' in column and '重播(' in column:
if '独播频道' in column:
cols = column.split('独播频道')
firstBroadcastChannel = '独播频道' + cols[1]
firstBroadcastTime = cols[0]
# '首播(生活): 一-六18:52 日18:42重播(生活): 一-五 日16:08首播(文史): 一-五22:43六日22:33/30重播(文史): 二-五06:46六日06:24'
if '(生活版)' in columnName:
if '首播(文史)' in firstBroadcastTime:
temp = firstBroadcastTime.split('首播(文史)')[0]
if '重播(生活)' in temp:
firstBroadcastTime = '首播时间: '+temp.split('重播(生活)')[0].replace('首播(生活): ','')
ReplayBroadcastTime = '重播时间: '+temp.split('重播(生活)')[1].replace(': ','') # 首播(文史): 一-五22:43六日22:33/30重播(文史): 二-五06:46六日06:24首播(生活): 一-六18:52 日18:42重播(生活): 一-五 日16:08
elif '(文史版)' in columnName:
if '首播(生活)' in firstBroadcastTime:
temp = firstBroadcastTime.split('首播(生活)')[0]
if '重播(文史)' in temp:
firstBroadcastTime = '首播时间: '+temp.split('重播(文史)')[0].replace('首播(文史): ','')
ReplayBroadcastTime = '重播时间: '+ temp.split('重播(文史)')[1].replace(': ','') elif '播出频道' in column:
cols = column.split('播出频道')
firstBroadcastTime = cols[0]
firstBroadcastChannel = '播出频道' + cols[1] elif '首播频道' in column:
cols = column.split('首播频道')
firstBroadcastTime = cols[0]
firstBroadcastChannel = '首播频道' + cols[1]
return firstBroadcastTime,ReplayBroadcastTime,firstBroadcastChannel def exportColumnInfo(self):
columns = self.db.GetCCTVColumnData() for col in columns:
columnName = col['columnName'].encode('utf8')
firstBroadcastTime = col['firstBroadcastTime'].encode('utf8')
firstBroadcastTime=firstBroadcastTime.replace('首播时间: ','') firstBroadcastChannel = col['firstBroadcastChannel'].encode('utf8').replace("播出频道:", "").replace("独播频道:", "").replace("首播频道:", "")
firstBroadcastChannel =firstBroadcastChannel.replace(")","").replace("(","").replace("CCTV-8电视剧","CCTV-8 电视剧")
firstBroadcastChannel = firstBroadcastChannel.replace("CCTV-1综合频道", "CCTV-1 综合频道")
firstBroadcastChannel = firstBroadcastChannel.replace("CCTV-1高清频道", "CCTV-1 高清频道")
firstBroadcastChannel = firstBroadcastChannel.replace("CCTV13", "CCTV-13")
firstBroadcastChannel = firstBroadcastChannel.replace("CCTV1", "CCTV-1")
firstBroadcastChannel = firstBroadcastChannel.replace("CCTV-少儿", "CCTV-14 少儿")
firstBroadcastChannel = firstBroadcastChannel.replace("CCTV6", "CCTV-6")
firstBroadcastChannel = firstBroadcastChannel.replace("CCTV-12社会与法", "CCTV-12 社会与法") replayBroadcastTime = col['replayBroadcastTime'].encode('utf8')
replayBroadcastTime = replayBroadcastTime.replace('重播时间:', '')
columnHost = col['columnHost'].encode('utf8')
columnUrl = col['columnUrl'].encode('utf8')
columnTimeName = col['columnTimeName'].encode('utf8')
columnTimeUrl = col['columnTimeUrl']
if columnTimeUrl:
columnTimeUrl = columnTimeUrl.encode('utf8')
officialWebsiteUrl = col['officialWebsiteUrl'].encode('utf8')
pastVideoUrl = col['pastVideoUrl'].encode('utf8')
colImgUrl = col['colImgUrl'].encode('utf8') # 栏目名称,首播时间,重播时间,播出频道,主持人,栏目url,栏目名称1(带时间的),栏目名称1url,往期视频url,栏目官网url,),栏目对应图片url
message = '\n{0},{1},{2},{3},{4},{5},{6},{7},{8},{9},{10}'.format(columnName, firstBroadcastTime,
replayBroadcastTime,
firstBroadcastChannel, columnHost,
columnUrl, columnTimeName,
columnTimeUrl, pastVideoUrl,
officialWebsiteUrl, colImgUrl) date = time.strftime('%Y-%m-%d')
self.WriteLog(message, date) obj = cctvColumnInfo()
# obj.getUrls()
# obj.CatchData()
# obj.getBroadCast()
obj.exportColumnInfo()
# coding=utf-8
import os
from pymongo import MongoClient
from pymongo import ASCENDING, DESCENDING
import codecs
import time
import columnData
import datetime
import re class mongoDbBase:
# def __init__(self, databaseIp = '127.0.0.1',databasePort = 27017,user = "ott",password= "ott", mongodbName='OTT_DB'):
def __init__(self, connstr='mongodb://ott:ott@127.0.0.1:27017/', mongodbName='OTT'):
# client = MongoClient(connstr)
# self.db = client[mongodbName]
client = MongoClient('127.0.0.1', 27017)
self.db = client.OTT
self.db.authenticate('ott', 'ott') def SaveCCTVColumnData(self,columnData,index):
count = self.db.column_data.find({'columnName': columnData.getColumnName()}).count()
if count == 0:
dictM ={'columnName':columnData.getColumnName(),
'firstBroadcastTime':columnData.getFirstBroadcastTime(),
'replayBroadcastTime':'',
'firstBroadcastChannel':columnData.getFirstBroadcastChannel(),
'columnHost':columnData.getColumnHost(),
'columnUrl':columnData.getColumnUrl(),
'columnTimeName':columnData.getColumnTimeName(),
'columnTimeUrl':columnData.getColumnTimeUrl(),
'officialWebsiteUrl':columnData.getOfficialWebsiteUrl(),
'pastVideoUrl': columnData.getPastVideoUrl(),
'colImgUrl':columnData.getColImgUrl(),
'index':index}
self.db.column_data.insert(dictM) def GetCCTVColumnData(self):
columns = self.db.column_data.find({},{'_id':0})
return columns def UpdateCCTVColumnData(self, columnData):
dictM ={'$set':{'replayBroadcastTime':columnData.getReplayBroadcastTime(),
'firstBroadcastTime':columnData.getFirstBroadcastTime(),
'firstBroadcastChannel': columnData.getFirstBroadcastChannel()}}
self.db.column_data.update({"columnName":columnData.getColumnName()},dictM) def SaveCCTVColumnUrl(self, url,suburl,columnName):
dictM = {'url': url, 'iscrawl': '','suburl':suburl,'columnName':columnName}
# db.urls.find({iscrawl:'1'}).count()
count = self.db.columnurls.find({'url': url}).count()
if count == 0:
self.db.columnurls.insert(dictM) def SaveCCTVColumnUrls(self, urlList,suburl):
index = 0
for url in urlList: # db.urls.find({iscrawl:'1'}).count()
count = self.db.columnurls.find({'url': url}).count()
if count == 0:
dictM = {'url': url, 'iscrawl': '', 'suburl': suburl,'index':index}
self.db.columnurls.insert(dictM)
index += 1
# self.db.Meeting.update({'title': meet["title"],'date': meet["date"]}, {'$set': dictM}, {'upsert': True}) def GetCCTVColumnUrls(self):
urls = self.db.columnurls.find({'iscrawl': '','suburl':''}, {'_id': 0, 'url': 1})
# for url in urls:
# #http://top.chinaz.com/hangye/index_yule.html
# print urls['url']
# break
return urls def GetSubCCTVColumnUrls(self):
urls = self.db.columnurls.find({'iscrawl': '', 'suburl': ''}, {'_id': 0, 'url': 1,'columnName':1})
# urls = self.db.columnurls.find({'firstBroadcastChannel': re.compile('栏目'), 'suburl': '1'}, {'_id': 0, 'url': 1, 'columnName': 1})
return urls
# def SetUrlCrawlState(self,urlList):
# for url in urlList:
# self.db.urls.update({'url':url},{'$set':{'iscrawl':'1'}}) def SetCCTVColumnUrlCrawlState(self, url):
# db.urls.update({iscrawl:'1'},{'$set':{iscrawl:'0'}},false,true)
self.db.columnurls.update({'url': url}, {'$set': {'iscrawl': ''}}) # d = mongoDbBase() # urls = []
# urls.append('abc')
# # d.SaveUrls(urls)
# d.SetUrlCrawlState(urls)
def download(self, url, name):
try:
# url='http://pp.myapp.com/ma_icon/0/icon_10910_1523714409/96'
# name='D:\work\python_crawl\down\2019.jpg'
pic = requests.get(url, timeout=5)
with open(name, 'wb') as f:
f.write(pic.content)
except requests.exceptions.ConnectionError:
print('当前图片无法下载')
[Python爬虫] 之三十:Selenium +phantomjs 利用 pyquery抓取栏目的更多相关文章
- [Python爬虫] 之三十一:Selenium +phantomjs 利用 pyquery抓取消费主张信息
一.介绍 本例子用Selenium +phantomjs爬取央视栏目(http://search.cctv.com/search.php?qtext=消费主张&type=video)的信息(标 ...
- [Python爬虫] 之十六:Selenium +phantomjs 利用 pyquery抓取一点咨询数据
本篇主要是利用 pyquery来定位抓取数据,而不用xpath,通过和xpath比较,pyquery效率要高. 主要代码: # coding=utf-8 import os import re fro ...
- [Python爬虫] 之二十五:Selenium +phantomjs 利用 pyquery抓取今日头条网数据
一.介绍 本例子用Selenium +phantomjs爬取今日头条(http://www.toutiao.com/search/?keyword=电视)的资讯信息,输入给定关键字抓取资讯信息. 给定 ...
- [Python爬虫] 之二十二:Selenium +phantomjs 利用 pyquery抓取界面网站数据
一.介绍 本例子用Selenium +phantomjs爬取界面(https://a.jiemian.com/index.php?m=search&a=index&type=news& ...
- [Python爬虫] 之二十九:Selenium +phantomjs 利用 pyquery抓取节目信息信息
一.介绍 本例子用Selenium +phantomjs爬取节目(http://tv.cctv.com/epg/index.shtml?date=2018-03-25)的信息 二.网站信息 三.数据抓 ...
- [Python爬虫] 之二十八:Selenium +phantomjs 利用 pyquery抓取网站排名信息
一.介绍 本例子用Selenium +phantomjs爬取中文网站总排名(http://top.chinaz.com/all/index.html,http://top.chinaz.com/han ...
- [Python爬虫] 之二十四:Selenium +phantomjs 利用 pyquery抓取中广互联网数据
一.介绍 本例子用Selenium +phantomjs爬取中广互联网(http://www.tvoao.com/select.html)的资讯信息,输入给定关键字抓取资讯信息. 给定关键字:数字:融 ...
- [Python爬虫] 之十九:Selenium +phantomjs 利用 pyquery抓取超级TV网数据
一.介绍 本例子用Selenium +phantomjs爬取超级TV(http://www.chaojitv.com/news/index.html)的资讯信息,输入给定关键字抓取资讯信息. 给定关键 ...
- [Python爬虫] 之十八:Selenium +phantomjs 利用 pyquery抓取电视之家网数据
一.介绍 本例子用Selenium +phantomjs爬取电视之家(http://www.tvhome.com/news/)的资讯信息,输入给定关键字抓取资讯信息. 给定关键字:数字:融合:电视 抓 ...
随机推荐
- Qt笔记——数据库的图形界面
1将读取的数据通过表格的方式显示出来 #ifndef WIDGET_H #define WIDGET_H #include <QWidget> #include <QSqlTable ...
- JQuery 实现 锚点跳转
$('.nav-jump').click(function() { $('html,body').animate( { scrollTop:$($.attr(this, 'href')).offset ...
- 云联云通讯报错:应用与模板id不匹配,解决方法
<statusMsg>应用与模板id不匹配</statusMsg> 这种一般是后端服务器上配置的APP ID和模板ID所属的APP不一致造成的 找到发送模板短信的方法,修改ap ...
- Partial Views
@Html.Partial("MyPartial") @Html.Partial("MyStronglyTypedPartial", new [] {&qu ...
- bootstrap中如何多次使用一个摸态框
/**弹出框设置**/ function showjcziimodal(url, width) { $("#jczii-modal").remove();//如果存在此Id的Mod ...
- 转:json注入
现在大部分web采用ajax通信,数据表现为json格式,因此可以尝试进行json注入. json注入:根据实际情况进行注入.有的时候,可能是为了方便,有人会手动拼接下JSON,但是这种随手代码,却可 ...
- XSL
前言 XSL,拓展样式表语言,可以理解为XML用的CSS,在其中定义xml格式对应的东西 放在xsl文件中 XSLT,按照XSL中的格式将XML转为XHTML 语法 XML声明: <?xml v ...
- Spring的远程调用
Spring远程支持是由普通(Spring)POJO实现的,这使得开发具有远程访问功能的服务变得相当容易 四种远程调用技术: ◆ 远程方法调用(RMI) ◆ Caucho的Hessian和Burlap ...
- BZOJ 2733 [HNOI2012]永无乡(启发式合并+Treap+并查集)
[题目链接] http://www.lydsy.com/JudgeOnline/problem.php?id=2733 [题目大意] 给出n个点,每个点都有自己的重要度,现在有连边操作和查询操作, 查 ...
- 【二分图匹配】BZOJ1562-[NOI2009] 变换序列
[题目大意] 对于0,1,…,N-1的N个整数,给定一个距离序列D0,D1,…,DN-1,定义一个变换序列T0,T1,…,TN-1使得每个i,Ti的环上距离等于Di.一个合法的变换序列应是0,1,…, ...