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标  题: FLAG Yelp Uber Palantir等公司面经(更新Lyft)

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发信人: wangya (fgdsb), 信区: JobHunting
标  题: FLAG Yelp Uber Palantir等公司面经(更新Lyft)
关键字: FLAG,面经
发信站: BBS 未名空间站 (Mon Apr 13 23:50:31 2015, 美东)

我LD最近面了一堆公司,下面发她的面经攒人品。基本都是电面和onsite混着发的。

Google:
1. Wildcard match
2. http://www.fgdsb.com/2015/01/25/peek-iterator/类似。写一个de duplicator,wrap 几个stream,输出的stream全是不重复数字。
3. 求一个stream,出现次数最多的数字。然后扩展到N个machine的情况。
4. 假设某个company在不同国家都有office,每个国家的office,如果是当地的假期,
就可以放假了。假设可以查询任意航班的信息,每个星期只能呆在一个地方,只有周末
的时候才能飞去别的国家。找一个放假天数最多的schedule。
5. LRU + 一些 C++问题。
6. 这题记不大清楚了。好像是Longest increasing consecutive sequence, 然后一
个Tree的该进版。求longest increasing consecutive path。
7. file system design。就是设计一个大数据的存取问题。存在disk上。我就是
partition + hash + cache那一套糊弄过去了。

Facebook:
因为签offer了,就不说太详细了。基本都是常见题甚至LC原题。但是follow up问的很
多,基本上常见题能用多种方法做的都会全问你一遍。比如问了一题count and say,
老掉牙的题了,写出代码还让证明any count不会超过三。比如1 11 21所有的digit都
不大于3。

Machine Zone:
1. sort color。
2. 有两个设计api的题目,具体的忘记了,都不难就对了。
3. 有两轮纯写query。问了些perfomance的问题,主要就是index的原理。写个几个很
长的query,一个一黑板那种变态的。
4. 一个leetcode medium的dp问题。
5. linkedin word distance 那题
/* This class will be given a list of words (such as might be tokenized
* from a paragraph of text), and will provide a method that takes two
* words and returns the shortest distance (in words) between those two
* words in the provided text.
* Example:
*   WordDistanceFinder finder = new WordDistanceFinder(Arrays.asList("the",
"quick", "brown", "fox", "quick"));
*   assert(finder.distance("fox","the") == 3);
*   assert(finder.distance("quick", "fox") == 1);
*/

Pure Storage:
一模一样的题目!!
http://www.mitbbs.com/article_t/JobHunting/32702941.html
多了一道,设计c++ virtual mechanism的design。虽然看过一点,知道的不多。但是
会逐渐给提示,follow hint就可以。pure storage喜欢一个题用好几种方法解,每个
题目都让不断的优化优化。

Uber:
1. regex match
2. 实现trie
3. youtube architecture设计。
4. 聊天。
5. min stack

Palantir:
1. 判断长度为K的substr有木有重复的字符。
2. LRU
3. 有个grid,每个cell记录的是click的次数,0或者大于0。求点击次数最多的region
。每个region的定义,是非零连续的一片。
4. 设计asteroid 游戏。
5. 实现一个纸牌游戏的logic。每人拿出最上面那张,比较大小,最大的胜出,winner
可以搜刮走loser打出的牌。如果有俩人的牌一样大,就比较上面数第四章的牌。  直
到某个人赢得了所有的牌
6. system design。distributed hash table
7. stock price。
                5/6      5/7   5/8
Stock1 :  100               200
Stock2:               50     100
Stock3:   150      200
Output:    250     350    500
空格代表价格没变化,跟前一天一样。如果第一天的为空,价格为0

ServiceNow:
1.各种概念啊!! Javascript, Angular.js, SQL
2. 发过来code,让改bug优化。
3.又是各种概念啊。Javascript, Angular.js, SQL。还有自己project的介绍

BigCommerce:
1. 聊天3轮。聊project。我的project,他们的project
2. leetcode上absolute path那题。
3. 有一轮,算是system design吧。让设计他们的payment系统。

Amazon:
1. 竟然安排我面试QA。理所当然的挂了。问了一道很简单的hashtable的题目,然后问
我怎么测试amazon web page。。
2. 概念:hashtable 实现方式。
代码: 拓扑排序。
还写了个电话号码的regex expression。
电面就挂了,没onsite。

Linkedin:
1. Word distance
2. 2 sum
3.
/**
* Given a nested list of integers, returns the sum of all integers in the
list weighted by their depth
* For example, given the list {{1,1},2,{1,1}} the function should return 10
(four 1's at depth 2, one 2 at depth 1)
* Given the list {1,{4,{6}}} the function should return 27 (one 1 at depth 1
, one 4 at depth 2, and one 6 at depth 3)
*/
4. permutation
5. reverse word in string (in place)
6. system design 类似这个
http://www.shuatiblog.com/blog/2015/01/09/big-data-real-time-to
7. 问project。把我问跪了。他们问的非常非常详细。我只准备了architecture,明显
不够用。一些具体logic也得准备。
8. minimum window substring
9. sqrt int + double版

Yelp:
1. Word ladder 2
2. 密码的combination。 phone number combination变体
3. 拓扑排序:一堆package,有dependency。求个安装顺序
4. permutation + combination合体,具体的太久忘记了,反正不难。
5. valid json。判断string是不是valid json object
跟版上很多人一样,题都不难,自我感觉良好。最后悲剧。

Lyft:
电面
* function to determine whether the driver is allowed to enter driver mode
* drivers are not allowed to drive a total of 12 hours without an 8 hour
break
* the function inputs are:
- a list of driver shifts as start/end integers, the integer is relative to
lyft launch
- the current time since lyft launch as integer

def can_drive(history, current_time):
    """
    Returns true if the driver has driven less than 12 hours since their
last 8 hour break
   
    history|array - Shifts, e.g. [(0, 12), (13, 19)]
    current_time|int - Current timestamp as hour since Lyft launch, e.g. 50

    can_drive = True example
        # 9 hour break, 1 hour shift, 2 hour break, 10 hour shift
        history = [(9, 10), (12, 22)]
        current_time = 24

    can_drive = False example:
        history = [(0, 4), (5, 9), (10, 14), (15, 19), (20, 24)]
        current_time = 24

没拿到onsite。

----------------

准备的话,虽然还是以leetcode为主,我协助她找工作也帮她做了一些事情,大家如果
觉得有用也可以看看:

1. 博客:http://www.fgdsb.com
这里面收集了不少leetcode没有的但是近期比较高频的面经题,我也提供了一些参考解
法。
当然有个别题的个别解法已经有热心观众指出错误了,但是由于我最近课比较多还没有
改,有空了一定改正,本人也不是搞竞赛出身,大牛求绕道。

2. 本地刷题平台:https://github.com/wangyanxing/Judge-at-fgdsb
现在支持mac和windows(windows启动速度比较慢)系统。类似于leetcode的本地版,
收集我博客里面大约40道比较常见的且LC没有的题并提供了测试案例和Judge功能。现
在支持C++/Java/Python/Lua/Ruby语言,当然你本地要有能运行的compiler。
现在还不是特别完善,但是已经完全可以用了,我还加了print功能,这个调试起来比
lc方便。有空我会把二叉树的visualization做了,相信大家对LC的 12##3#4 这种二叉
树表示方法不爽很久了哈哈。
release链接在这里:https://github.com/wangyanxing/Judge-at-fgdsb/releases

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