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

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Solutions to Chapter 12 | Testing 12.5 How would you test a pen? SOLUTION pg 70 This problem is largely about understand the constraints: what exactly is the pen? You should ask a lot of questions to understand what exactly you are trying to test. To illustrate the technique in this problem, let us guide you through a mock-conversation. Interviewer: How would you test a pen? Candidate: Let me find out a bit about the pen. Who is going to use the pen? Interviewer: Probably children. Candidate: Ok, that’s interesting. What will they be doing with it? Will they be writing, drawing, or doing something else with it? Interviewer: Drawing. Candidate: Ok, great. On what? Paper? Clothing? Walls? Interviewer: On clothing. Candidate: Great. What kind of tip does the pen have? Felt? Ball point? Is it intended to wash off, or is it intended to be permanent? Interviewer: It’s intended to wash off. …. many questions later ... Candidate: Ok, so as I understand it, we have a pen that is being targeted at 5—10 year olds. The pen has a felt tip and comes in red, green, blue and black. It’s intended to wash off clothing. Is that correct? … The candidate now has a problem that is significantly different from what it initially seemed to be. Thus, the candidate might now want to test: 1. Does the pen wash off with warm water, cold water, and luke warm water? 2. Does the pen wash off after staying on the clothing for several weeks? What happens if you wash the clothing while the pen is still wet? 3. Is the pen safe (e.g.—non-toxic) for children? and so on... 2 1 3 Cracking the Coding Interview | Concepts and Algorithms
Solutions to Chapter 12 | Testing 12.6 How would you test an ATM in a distributed banking system? SOLUTION pg 70 The first thing to do on this question is to clarify assumptions. Ask the following questions: »» Who is going to use the ATM? Answers might be “anyone,” or it might be “blind people” - or any number of other answers. »» What are they going to use it for? Answers might be “withdrawing money,” “transferring money,” “checking their balance,” or many other answers. »» What tools do we have to test? Do we have access to the code, or just the ATM machine? Remember: a good tester makes sure she knows what she’s testing! Here are a few test cases for how to test just the withdrawing functionality: »» Withdrawing money less than the account balance »» Withdrawing money greater than the account balance »» Withdrawing money equal to the account balance »» Withdrawing money from an ATM and from the internet at the same time »» Withdrawing money when the connection to the bank’s network is lost »» Withdrawing money from multiple ATMs simultaneously CareerCup.com 2 1 4
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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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Solutions to Chapter 6 | Brain Teas
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Solutions to Chapter 7 | Object Ori
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Page 153 and 154: Solutions to Chapter 7 | Object Ori
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Solutions to Chapter 18 | Threads a
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Solutions to Chapter 19 | Moderate
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Solutions to Chapter 20 | Hard 2. O
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Solutions to Chapter 20 | Hard 20.3
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Solutions to Chapter 20 | Hard 10 1
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Solutions to Chapter 20 | Hard 28 i
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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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Cracking the Coding Interview, 4 Edition - 150 Programming Interview Questions and Solutions

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