W***o
发帖数: 6519 | 1 【 以下文字转载自 Programming 讨论区 】
发信人: Wardo (餐厅忙的时候客户端，否则服务端), 信区: Programming
标 题: 说一道关于unbalanced树的面试题
发信站: BBS 未名空间站 (Fri Oct 28 16:39:00 2016, 美东)
前两天面试一个公司，题目是用bfs在tree上找string，但是unbalanced tree.
可能有点先入为主的概念，我开始“默认”这是一个unbalanced binary search tree
，写代码到一半的时候，面试的人一再强调unbalanced tree，我当时也被他弄懵了。
写到最后，他说这是一个unsorted tree，我恍然大悟，原来开始他说的unbalanced
tree就是unsorted 的意思，我k，这能是同一个概念吗
我改代码完了之后，他又继续说：这tree里可能有cycle，也就是两个parent nodes可
能会共享一个儿子或孙子node，我k，真是烦。一个tree弄的这么复杂，面试的人真是
有点变态。不过话说回来也怪我一开始没跟他问清楚！最后面试完了想... 阅读全帖 |
|
W***o
发帖数: 6519 | 2 前两天面试一个公司，题目是用bfs在tree上找string，但是unbalanced tree.
可能有点先入为主的概念，我开始“默认”这是一个unbalanced binary search tree
，写代码到一半的时候，面试的人一再强调unbalanced tree，我当时也被他弄懵了。
写到最后，他说这是一个unsorted tree，我恍然大悟，原来开始他说的unbalanced
tree就是unsorted 的意思，我k，这能是同一个概念吗
我改代码完了之后，他又继续说：这tree里可能有cycle，也就是两个parent nodes可
能会共享一个儿子或孙子node，我k，真是烦。一个tree弄的这么复杂，面试的人真是
有点变态。不过话说回来也怪我一开始没跟他问清楚！最后面试完了想骂人 |
|
W***o
发帖数: 6519 | 3 根据我后来的感觉，面试我的这个人主要是想让我用一个额外的空间数组来track
visited
nodes，这样就会避免cycle的问题。可是，在树上用bfs的时候谁用的着额外的空间数
组来track visited node啊？因为tree根本就不应该有cycle的。
所以，那个面试从一开始他说unbalanced，我就开始犯晕。用bfs还管是否unbalanced？
面试最后他说这是一个unsorted tree，我不得不把判断left/right的那几行去掉，反
正就是统统遍历一次好了。
总之奇葩的面试: unsorted 说成unbalanced；tree里还有tmd cycle |
|
i********f
发帖数: 206 | 4 在用R里面的aov函数做Two-way ANOVA.
听说这个函数对balanced的数据处理挺不错的,
但是对于unbalanced的数据,处理的不如SAS,
想问一下R里面还有什么别的方法做Two-way ANOVA么?
主要是针对unbalanced的数据
谢谢 |
|
s**********g
发帖数: 14942 | 5 unbalanced tree也没有默认sorted啊..
这个他本来可能想考你communication吧,因为面试一上来不应该先把各种犄角旮旯的
trick问清楚吗..sort与否是最基本的之一了吧 |
|
c********t
发帖数: 5706 | 6 有cycle还能叫tree吗? 应该骂他。求问一下, bfs或dfs对于unbalanced tree 与
balanced tree有什么不一样吗？
tree |
|
W***o
发帖数: 6519 | 7 bfs 和 dfs 输出的顺序不一样吧。 unbalanced tree 就是注意一下 缺一个或两个孩
子的情况吧 |
|
c********t
发帖数: 5706 | 8 碰到这样的，真是倒霉。感觉面试70%靠运气，30%靠实力。不过以后先clarify所有问
题再开始解决会比较好。
我的意思是我做bfs 或dfs travel的时候, 从来没考虑tree是不是balanced呀，
unbalanced缺孩子，要做哪些判断？能给个三行codes讲一下吗？多谢！ |
|
s**********g
发帖数: 14942 | 9 tree上用bfs不需要额外空间存visited
但是增加visited也就是一点点code的事儿吧？
unbalanced？ |
|
M********t
发帖数: 5032 | 10 Linus Torvalds因内核注解标点格式发飙
solidot
teikaei
21小时54分钟前
Linus Torvalds在Linux内核邮件开发者列表上再次发飙，将部分程序员偏爱的代码注
解标点格式称为“脑残”。他强烈反对的注解格式类似：/* This is disgusting drug
-induced * crap, and should die */（具体见下图）
和/* This is also very nasty
* and visually unbalanced */
他个人支持的格式类似：
/* This is a comment */
和
/*
* This is also a comment, but it can now be cleanly
* split over multiple lines
*/ |
|
W***o
发帖数: 6519 | 11 关键是他把unsorted开始说成了unbalanced了，把我给绕晕 |
|
W***o
发帖数: 6519 | 12 是啊，面试我的那个鸟人，我最后真是很想骂街。
我怀疑他把unbalanced 混淆成 unsorted了，最后又冒出来说这个tree可能有cycle，
我让他解释什么是tree的cycle。。。。真是晕菜 |
|
l*****k
发帖数: 587 | 13 In the case of two sample types, one has 100 samples
the other has like 7 or 8 samples. What is the best
test we can use to detect significantly different
variables (there are over 50K variables)
Another question is if permutation test has any benefit
in this case.
Since it is unbalanced, is it possible to select 10 samples
randomly from the the sample type with 100 samples and compare
with the sample type with 7 samples, do this multiple time and
look at which gene consistently come out? I wond |
|
P******e
发帖数: 75 | 14 我们从Literature里收集了很多关于牛奶中18种氨基酸的含量的数据，每个数据点是文
献当中的平均值。不同文章的牛奶在不同时间收集，不同地方来源.
数据整理后,我们想看一下不同因子有没有影响。
从三个因素考虑，分别是time,region,term.数据是不平衡的.
下表标出了其中两个因素。每个格子里面是多少个观测点。可见是很不平衡的。
Region1 Region2 Region3 Region4
time1 . 6 2 1
time2 . 7 2 3
time3 1 8 7 5
time4 1 11 4 5
time5 3 10 . 2
我们有几个问题请教：
1. 由于我们的每个数据点是每篇文献当中的平均值,能用ANOVA么?数据好像不是很正态
分布。要检测Assumptions?
2. 对我们这个unbalanced的数据处理,可以做Three-way ANOVA么?
3. 用proc GLM, Model AA1 AA2=tim |
|
n**m
发帖数: 156 | 15 For example，if I have gender in the regression formula. My data has 90 Male
and 10 Female.
I know it is not good to have two groups so unbalanced. The estimate of
gender will have relative big standard error. Is there any other downside
for including it as explanatory variable?
What if it is a dependent variable in logistic regression?
Thanks. |
|
c********h
发帖数: 330 | 16 如果是做response的话，看accuracy的时候要注意，因为认为所有都是男的，accuracy
还有0.9，一般用precision recall。另外太unbalanced的话，可能fitting不converge |
|
d****y
发帖数: 398 | 17 现在的问题是: 我有650个人 按照一定的规则被分在了15个组 现在需要看一个
outcome variable的结果 (也就是个很简单的anova 或者create dummy variables 做
regression的问题) 但是有的组按照规则就只有一个人在里面 想问问这种
unbalanced的情况 一般的anova/ancova或者dummy variables的方法还可以用吗 或者
有什么别的方法能用的吗 多谢了 包子答谢 |
|
发帖数: 1 | 18 是machine learning的课程项目。
我们的数据是unbalanced,大部分是continuous, 只有少数几列是categorical的，因为
我们要用到logistic regression, svm, 所以把categorical都转化为dummy variable,
结果在用SMOTE的时候这些dummy cariable都变成0到1之间的数据。
现在两个问题：
1）原本的class组成是10700 class-1, 1450 class-0;用完SMOTE, 数据变成 5500
class-1, 4100 calss-0; 这些categorical的数据不能单独拿出来呀？ 本身SMOTE用的
就是点到点之间的距离来cluster这些点的；
2）现在想死马当活马来用，想把 《0.5 的归于0；》=0.5的归为1。
了很 |
|
g*********3
发帖数: 177 | 19 各位大神，有没有这方面的经验：
实际项目中，数据库的postive/negative data points是极度unbalanced的。比如
crime database里面有1million individual，crime有100(positive data point)，剩
下的全部是negative data point。
需要用这些数据建立一个machine learning model来classify将来一些人的crime。
怎样设计training dataset呢？有什么好的统计或者ML的方法吗？
谢谢。 |
|
k*****n
发帖数: 9823 | 20 ☆─────────────────────────────────────☆
PKO (隆 贝多芬) 于 (Mon Oct 10 09:07:27 2005) 提到:
有的前级有balance和unbalance两种接口，有的只有一种，但是balance的机型要比
unbalance贵，这是什么意思的说？
☆─────────────────────────────────────☆
yfei (one flew over...) 于 (Mon Oct 10 11:06:27 2005) 提到:
balanced就是XLR口，unbalanced一般就是RCA。
balanced可以消除进入信号线的外部干扰，适合做长距离的。像演唱会的话筒除了无线的
都是XLR的。 http://en.wikipedia.org/wiki/XLR
如果CD和攻放就2米远，unbalanced应该够用了。 但是这种情况下还是有人说balanced
声音更好。
我的balanced+unbalanced双接口攻放就要到了，到时候我比较一下。
☆─────────────────── |
|
m*********e
发帖数: 944 | 21 Tennessee: 共有7人。only 1 in first team offense, but 4 in first and second
team defense and 2 on special teams. 攻弱守强，unbalanced， coach on hot
seat.
Georgia: 共有3人。2 on offense, 1 on defense, balanced, however, not enough
talent to control own destination.
Florida：共有8人。5 on offense, 2 on defense, 1 on special teams, unbalanced
, 攻强守弱.
LSU: 共有10人。3 on offense, 5 on defense, 2 on special teams, balanced, SEC
champion.
Auburn: 共有2人。0 on offense, 1 on defense, 1 on special teams, unbalanced,
lucky from t |
|
h*****y
发帖数: 42 | 22 Well, the best way to remember the war is to learn the lesson. Why opium war
happens? unbalanced trade. What's happening today? unbalanced trade. 屁民卖
苦力做袜子给政治局买飞机，这个版这么多phd难道都是读书读多了不知民间疾苦么，
就知道愤青，从义和团到红卫兵再到你，喊起来一头劲。你如果可以在祖国混的好，干
吗出国？现在别人帮你呐喊你的人权，你倒摆摆手说你不配，老佛爷许才许，我呸。
他山之石，可以功玉，人家说的在不在理我也不跟你辩，但冲人不吊你带他那什么花的
气质也拉你这在异国流浪的新义和团民几条街... |
|
o**1
发帖数: 6383 | 23 ☆─────────────────────────────────────☆
MarketMaker (BigWave) 于 (Wed Nov 10 16:44:14 2010, 美东) 提到:
I always thought respect is mutual.
《每日电讯报》说，卡梅伦与阁员在人民大会堂时，拒绝中方对他们除下罂粟花的要求。
该报引述随行的一名首相府人员说：“中方人员对我们说佩戴罂粟花是不恰当的，因为
两国曾经发生鸦片战争。我们告诉他们这花对我们有重大意义，我们所有人会继续佩戴
。”
很多英国人习惯在11月份在衣襟佩戴罂粟花，纪念两次大战和其他战争中牺牲的英国军
人和平民。
http://en.wikipedia.org/wiki/First_Opium_War
The first Opium War was the beginning of a long period of weakening the
state and civil revolt in China, and long-term depopulation. In 1842, China'... 阅读全帖 |
|
l****z
发帖数: 29846 | 24 By J.R. Dunn
Obama is finished. It's not so much the past six weeks, rough as they were,
as his own actions and responses that have finished him. His showdown with
Congress over the debt limit, which he then ran away from. His
bewilderment at the fact that markets responded to that level of stress with
a serious slump. The lousy job numbers, which anybody but Obama and his
kept economists could have predicted. His insistence on his precious
vacation at a time when the country was deeply sha... 阅读全帖 |
|
a*****s
发帖数: 2663 | 25 没有提到XLR，听起来是entry level mixer，只有1/4口，你说有两种，不知道你是说
接口有TS（mono）和TRS两种，还是说1/4inch的cable有TS和TRS两种？一般来说，买
TRS的没错，可以兼容balanced和unbalanced signal。TS的应该也行，只是你的signal
肯定就成了unbalanced的了。
如果知道你的mixer型号，和麦克风型号，这个问题就好回答多了。不然有可能误导。 |
|
c*******r
发帖数: 603 | 26 如图。有一对 R/L 1/4“ unbalanced 输出，还有一个1/8"stereo输出。说明书上说，
the signal (from the unbalanced outputs) is duplicated on a stereo 1/8“
jack
那么这两种输出口的音质有区别吗？多谢！ |
|
|
t**g
发帖数: 1164 | 28 一个unbalanced binary tree
每个节点记录一个整数
对每个节点值
左边的child小于当前节点
右边的child大于当前节点
所以你插入1,2,3,4,5...n,会得到一个depth=n的树
可是插入6,4,8,3,5,7,9，就会得到一个well balanced tree
问题：
What is the average asymptotic depth of a simple unbalanced search tree of
integers? Use O(n) notation and provide proof |
|
I*********y
发帖数: 185 | 29 我明白，你是说用BFS找第一个leaf node，找到就停，这个对于unbalanced tree比较
快。
我就是想知道用min 和 max这种方法是不是有可能不正确。如果正确的话，也算是一个
O(N)的候选方法，虽然对于unbalanced tree可能慢些。
了 |
|
c*******u
发帖数: 12899 | 30 ☆─────────────────────────────────────☆
MyDora (家有懒猫－迷恋咖啡香味) 于 (Thu Jan 20 23:32:03 2011, 美东) 提到:
这个要看你们俩的染色体有没有问题吧，如果父母染色体都正常的话，那 不太好说，
如果是从父母一方继承的话，应该没大问题。
☆─────────────────────────────────────☆
northbeach (Oops) 于 (Thu Jan 20 23:53:24 2011, 美东) 提到:
你应该马上找医生问，有专门遗传方面的医生啊。
translocation,
can
and
☆─────────────────────────────────────☆
qingq (asura) 于 (Thu Jan 20 23:58:02 2011, 美东) 提到:
结果出来后医生没有详细的解释？
☆─────────────────────────────────────☆
lifelove (为什么我炒鸡蛋都糊？) 于 (Thu Jan 2... 阅读全帖 |
|
p*******o
发帖数: 6791 | 31
方法是现成的, 虽然复杂度高了点, 是 O(|V|^3) 的, 不过10几个人还算好了. 嗯不对
, 男女比例不是1:1哈, 是unbalanced,
这样unbalanced one to one match会比较麻烦...
总之先让大家把cost matrix数据贡献出来 |
|
R*******n
发帖数: 428 | 32 > 有意思。 单打这个52%比想象的大不少。
最有意思的是双打发球方居然有不利的时候。
与羽毛球有关的数学文章我还写过好几个。下面是另外一篇。比较
新旧记分制的长度问题。同上，这是数学家的游戏之作，对数学不
感兴趣的请跳过。主要结论：新记分制比老记分制节约1/3时间。
====================================================
Comparison of the new and old badminton scoring system
On May 6th, 2006, the International Badminton Association
has decided to officially change the scoring rule in
Badminton, so that the game time can be more controllable
(shorter).
For a quick reference, here's a short description of the two
systems.
Old ru... 阅读全帖 |
|
l******l
发帖数: 2679 | 33 Interesting experiment!
It is debatable even among professionals whether this shocking recipe has
lasting health effects if not negative ones. If it does have positive
effects, it still needs to be done regularly to have long term benefits.
At some part of the world where folks have the tradition of fasting
regularly to cleanse the body. The theory is, our daily food always contains
toxic substances or unbalanced that causes our body chemically unbalanced
and we need periodically reset it to a h |
|
p***r
发帖数: 4859 | 34 ☆─────────────────────────────────────☆
LittleZane (Mr. Bean) 于 (Thu Jul 21 13:08:14 2011, 美东) 提到:
挖个小坑。
大家都是怎么系鞋带的呢。我会两种，但都不对（‘unbalanced ':
http://www.runnersworld.com/article/0,7120,s6-240-319--13001-0,
就是圈圈有点上下排，而不是左右。最近发明一种新系法，不上下排了，但两个鞋带头
跑一边去了。看样子事情大小都有学问啊。
☆─────────────────────────────────────☆
foolsgold (When can I do MP 165lbs?) 于 (Thu Jul 21 13:23:58 2011, 美东) 提到:
普通的双折结完了之后双折的部分再打个结就完了。
☆─────────────────────────────────────☆
Mutu (Camoranesi) 于 (Thu Jul 21 13:27:30 2... 阅读全帖 |
|
L****n
发帖数: 490 | 35 He posted this a long time ago. Maybe rewrite it for magazine.
This is the complete list
1. Hrmm, this K5s looks kinda good
2. I will never play anything but these 18 hands under any circumstances
3. I need to fold postflop if I don't hit a hand. And I need to fold to
pressure if I don't have a great hand.
4. Maybe I can loosen up a little bit in position. I can play more hands
because I know how to fold them postflop.
5. I need to bet my good hands hard so I can get value for them.
*** This is ... 阅读全帖 |
|
v*****r
发帖数: 2325 | 36 two hand swing is easier on body... one arm swing/snatch pose higher stress on
torso. (common sense physics tells us that that's something unbalanced to be balanced danamically, exertion of force needed somewhere to balance the unbalanced)
i did quiete some single arm swing/snatch last week... and single arm MP, single hand push up. not sure if it contributed to the pain in my rib or not. it is even not obvious which move caused the pain. the time the pain started is moderate bicycling... but |
|
T***N
发帖数: 1835 | 37 第一次在movie版发帖。。。
趁着科幻热，又看了一遍黑客帝国123。
第一遍是高中看，感觉就是爽，
第二遍大学时看的，感觉很疑惑。
第三遍刚来美国看的，感觉后背发麻。
第四遍刚看的，最后感到充满了希望。
转载一篇解析吧，解释的很好，观点也都基本同意。。。
《黑客帝国》完全解析
发布时间: 2012-01-14 22:46 阅读: 27771 次 推荐: 43 原文链接 [收藏]
万事皆有始亦有终——《The Matrix》影评之终结篇
一、前言
从 Matrix I 到 Matrix III，整整四年，一对名叫沃卓斯基（导演加编剧）的兄
弟给科幻电影带来一次史无前例的冲击，无论从思想上还是视觉效果上都超过了以往任
何一部科幻电影，从来没有一部科幻电影能够创造这么多的 Fans 也没有任何一部科幻
电影能像 Matrix 这样引发如此大规模的讨论——讨论剧情，讨论主题，讨论特效，讨
论演员，笔者绝不敢自称 100% 的看懂了（我把看懂定义为“理解沃卓斯基兄弟眼中剧
情和主题的原意”，以免就这个“看懂”一词遭来无数的非议），但是我愿意把我所理
解的 The Matrix 的... 阅读全帖 |
|
|
s*****0
发帖数: 357 | 39 周末杂事比较多，小孩的playdate，还有和朋友约定的网战等等，未能及时更新，见谅。
感谢楼上hbsr2010的一些概念更正，平时理论接触的少了，记忆有偏差，因为在网上随
便写些，也懒得查书，写的时候随兴所至，没有太注意。我尽量让文笔轻快些，让读者
不至于厌烦。以后尽量会避免误导，如有不确实之处，请务必指正。先行谢过了，因为
有自己的一摊东西要收拾，不能像做科研那样严谨了。
前文提到的t test, one way ANOVA以及相关的nonparametric都只有涉及到一个
variable，比如作对照实验，variable即treatment type，不同计量药物或者是
placebo。组和组的区分是由这个variable决定的。在涉及到更为复杂的模型前(比如
two way ANOVA, multiple regression)，我觉得还是先唠叨唠叨categorical data的
统计方法，毕竟做multiple regression之类的工作需要一定的统计背景，平时远没有
Chi-square这样的test用得多。所以先简后难了。
Categorical data在生... 阅读全帖 |
|
t**g
发帖数: 1164 | 40 【 以下文字转载自 JobHunting 讨论区 】
发信人: ttgg (还在苦苦思索昵称中), 信区: JobHunting
标 题: 请教一个binary tree问题
发信站: BBS 未名空间站 (Fri Feb 26 00:18:36 2010, 美东)
一个unbalanced binary tree
每个节点记录一个整数
对每个节点值
左边的child小于当前节点
右边的child大于当前节点
所以你插入1,2,3,4,5...n,会得到一个depth=n的树
可是插入6,4,8,3,5,7,9，就会得到一个well balanced tree
问题：
What is the average asymptotic depth of a simple unbalanced search tree of
integers? Use O(n) notation and provide proof |
|
x******6
发帖数: 160 | 41 mentor_2_nodup_active 数据库里面有一些mentor的名字 （mentor_name_2），
mentor_one_mentee_active 数据库里面有另外一些mentor的名字 （mentor_name_1），
mentor_name_2里面的一些名字和mentor_name_1里面的名字是一样的，
我想看看哪些mentor的名字两个数据库里面都有，
我用sql create 一个 macro variable，
然后查找，可是最后给我的结果是0，原因是: The quoted string currently being
processed has become more than 262 characters long. You may have unbalanced
quotation marks.
不知道哪位sas高人能给指点一下，怎样解决这个sas macro的问题。
BTW： 我知道可以用 sas data step来merge两个 databases。可是，我不想这样做，
因为还要sort数据，rename variable。
proc sql;... 阅读全帖 |
|
p**********d
发帖数: 7918 | 42 China calls for domestic unrest to be defused
By Chris Buckley
Mon Feb 21, 7:37 am ET
BEIJING (Reuters) – China must find new ways to defuse unrest, the domestic
security chief said,
underscoring Beijing's anxiety about control after police quashed calls for
gatherings inspired by uprisings
in the Middle East.
A Foreign Ministry official separately blamed the political violence
sweeping the Middle East on too-slow
growth and stunted efforts at reform.
Zhou Yongkang, the ruling Communist Party's ... 阅读全帖 |
|
c*********2
发帖数: 3402 | 43 http://www.theatlantic.com/international/archive/2012/01/is-chi
By Joshua Foust
Jan 11 2012, 11:13 AM ET 3
For all the fears of Chinese expansionism westward, the rising power doesn't
actually seem to be doing all that much
Kazakh President Nazarbayev toasts with Chinese counterpart Hu as they meet
in Astana / Reuters
Debating China's role in the world, or in neighboring regions, has become
something of a blood sport: policy wonks love debating it and watching the
debates about it, while normal ... 阅读全帖 |
|
t******y
发帖数: 748 | 44 Is it the war that caused this unbalanced rate? |
|
E*U
发帖数: 2028 | 45 "China is still a developing country, and we should be wise enough to know
ourselves," said Yi Gang, China's chief currency regulator, when asked
whether the time was ripe for the yuan to become an international currency.
Yi said Beijing had no timetable to make the yuan fully convertible.
"China is very big and its development is unbalanced, which makes this
problem much more complicated. It's difficult to reach a consensus on it,"
he said.
In the same vein, China was in no rush to turn the yua |
|
E*U
发帖数: 2028 | 46 "China is still a developing country, and we should be wise enough to know
ourselves," said Yi Gang, China's chief currency regulator, when asked
whether the time was ripe for the yuan to become an international currency.
Yi said Beijing had no timetable to make the yuan fully convertible.
"China is very big and its development is unbalanced, which makes this
problem much more complicated. It's difficult to reach a consensus on it,"
he said.
In the same vein, China was in no rush to turn the yua |
|
s******r
发帖数: 5309 | 47 This only works if the trade is balanced between the 2 countries. In that
case, they can do barter trade
without any money involved. If unbalanced, one party need to purchase the
other party's currency on the
market, which will require both currencies to be freely exchangeable, this
is not the case. |
|
d*****l
发帖数: 8441 | 48 The International Monetary Fund's 187 member countries gave voice to long-
running frustrations of emerging economies, which say the Fund has
traditionally not been tough enough on its biggest shareholders, led by the
United States.
Now, with the United States and Europe in the doldrums, and emerging
economies providing the major growth engine for the world, the tables appear
to be turning.
"Stronger and even-handed surveillance to uncover vulnerabilities in large
advanced economies is a priorit... 阅读全帖 |
|
|
w****2
发帖数: 12072 | 50 【 以下文字转载自 CS 讨论区 】
发信人: wlwl12 (戒网), 信区: CS
标 题: Stevey's Google Platforms Rant
发信站: BBS 未名空间站 (Fri Oct 14 14:56:59 2011, 美东)
Stevey's Google Platforms Rant
I was at Amazon for about six and a half years, and now I've been at Google
for that long. One thing that struck me immediately about the two companies
-- an impression that has been reinforced almost daily -- is that Amazon
does everything wrong, and Google does everything right. Sure, it's a
sweeping generalization, but a surprisingly acc... 阅读全帖 |
|
