http://www.wechall.net/challenge/impossible/index.php
这道题要求在6秒内分解一个超级大的整数，所以标题的名字都是”impossible”
这道题比较奇怪的一个地方是，如果你输入了错误的答案，他会把正确的答案告诉你，而这按理来说并不需要。于是从这里入手，发现即使答错，问题的整数还是没有变，这就给了我们再次尝试的机会。也就是说，先得到正确答案，然后在6秒之内再回答就行。
下面是python代码
#!/usr/bin/env python2
import urllib
import urllib2
import re
if __name__ == "__main__":
url = "http://www.wechall.net/challenge/impossible/index.php?request=new_number"
req = urllib2.Request(url)
req.add_header('cookie','WC=7436562-11403-u5AFYCNQVEgMepLw')
response = urllib2.urlopen(req)
url = "http://www.wechall.net/challenge/impossible/index.php"
values = {'solution':1, 'cmd':'Send'}
data = urllib.urlencode(values)
req = urllib2.Request(url, data)
req.add_header('cookie','WC=7436562-11403-u5AFYCNQVEgMepLw')
response = urllib2.urlopen(req)
content = response.read()
p = re.compile('Correct would have been "(\d*)&')
sol = p.search(content).group(1)
print sol
values = {'solution':sol, 'cmd':'Send'}
data = urllib.urlencode(values)
req = urllib2.Request(url, data)
req.add_header('cookie','WC=7436562-11403-u5AFYCNQVEgMepLw')
response = urllib2.urlopen(req)
content = response.read()
print content