Cracking the Coding Interview, 4 Edition - 150 Programming Interview Questions and Solutions

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Solutions to Chapter 11 | System Design and Memory Limits 11.1 If you were integrating a feed of end of day stock price information (open, high, low, and closing price) for 5,000 companies, how would you do it? You are responsible for the development, rollout and ongoing monitoring and maintenance of the feed. Describe the different methods you considered and why you would recommend your approach. The feed is delivered once per trading day in a comma-separated format via an FTP site. The feed will be used by 1000 daily users in a web application. SOLUTION pg 72 Let’s assume we have some scripts which are scheduled to get the data via FTP at the end of the day. Where do we store the data? How do we store the data in such a way that we can do various analyses of it? Proposal #1 Keep the data in text files. This would be very difficult to manage and update, as well as very hard to query. Keeping unorganized text files would lead to a very inefficient data model. Proposal #2 We could use a database. This provides the following benefits: »» Logical storage of data. »» Facilitates an easy way of doing query processing over the data. Example: return all stocks having open > N AND closing price < M Advantages: »» Makes the maintenance easy once installed properly. »» Roll back, backing up data, and security could be provided using standard database features. We don’t have to “reinvent the wheel.” Proposal #3 If requirements are not that broad and we just want to do a simple analysis and distribute the data, then XML could be another good option. Our data has fixed format and fixed size: company_name, open, high, low, closing price. The XML could look like this: 126.23 130.27 122.83 1 9 7 Cracking the Coding Interview | Concepts and Algorithms
Solutions to Chapter 11 | System Design and Memory Limits 127.30 52.73 60.27 50.29 54.91 . . . Benefits: »» Very easy to distribute. This is one reason that XML is a standard data model to share / distribute data. »» Efficient parsers are available to parse the data and extract out only desired data. »» We can add new data to the XML file by carefully appending data. We would not have to re-query the database. However, querying the data could be difficult. CareerCup.com 1 9 8
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CRACKING THE FOURTH EDITION C O D I
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Table of Contents Chapter 7 | Objec
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Introduction Something’s Wrong We
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Behind the Scenes For many candidat
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Behind the Scenes | The Amazon Inte
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Behind the Scenes | The Apple Inter
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Interview War Stories The View from
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Interview War Stories | Pop Divas P
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Interview War Stories | You Can (Ma
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Interview War Stories | Spider Sens
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Before the Interview | Resume Advic
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Before the Interview | Behavioral P
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Before the Interview | Technical Pr
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The Interview and Beyond
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At the Interview | Handling Behavio
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At the Interview | Handling Technic
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At the Interview | Five Algorithm A
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At the Interview | Five Algorithm A
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At the Interview | The Offer and Be
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At the Interview | Top Ten Mistakes
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At the Interview | Frequently Asked
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Interview Questions
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Chapter 1 | Arrays and Strings Hash
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Chapter 2 | Linked Lists How to App
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Chapter 3 | Stacks and Queues How t
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Chapter 4 | Trees and Graphs How to
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Part 2 Concepts and Algorithms
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Chapter 5 | Bit Manipulation 5.1 Yo
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Chapter 6 | Brain Teasers 6.1 Add a
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Chapter 7 | Object Oriented Design
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Chapter 8 | Recursion 8.1 Write a m
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Chapter 9 | Sorting and Searching 9
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Chapter 10 | Mathematical 10.1 You
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Chapter 11 | Testing 11.1 Find the
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Chapter 12 | System Design and Memo
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Chapter 13 | C++ How To Approach: A
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Chapter 14 | Java How to Approach:
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Chapter 15 | Databases How to Appro
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Chapter 16 | Low Level How to Appro
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Chapter 17 | Networking How to Appr
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Chapter 18 | Threads and Locks How
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Part 4 Additional Review Problems
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Chapter 19 | Moderate _____________
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Chapter 20 | Hard Input: DAMP, LIKE
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Solutions
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Solutions to Chapter 1 | Arrays and
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Solutions to Chapter 2 | Linked Lis
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Solutions to Chapter 3 | Stacks and
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Solutions to Chapter 4 | Trees and
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Solutions to Chapter 5 | Bit Manipu
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Page 137 and 138: Solutions to Chapter 6 | Brain Teas
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Solutions to Chapter 18 | Threads a
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Solutions to Chapter 20 | Hard 10 1
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Solutions to Chapter 20 | Hard 23 }
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Solutions to Chapter 20 | Hard Val_
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Index A arithmetic 108, 131, 143, 1
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Mock Interviews Mock Interviews Stu
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