Dynamic Programming For Coding Interviews


Dynamic Programming For Coding Interviews
Author: Meenakshi
Publisher: Notion Press
ISBN: 194655670X
Size: 14.54 MB
Format: PDF, Kindle
View: 451
Get Books

Dynamic Programming For Coding Interviews

eBook File: Dynamic-programming-for-coding-interviews.PDF Book by Meenakshi, Dynamic Programming For Coding Interviews Books available in PDF, EPUB, Mobi Format. Download Dynamic Programming For Coding Interviews books, I wanted to compute 80th term of the Fibonacci series. I wrote the rampant recursive function, int fib(int n){ return (1==n || 2==n) ? 1 : fib(n-1) + fib(n-2); } and waited for the result. I wait… and wait… and wait… With an 8GB RAM and an Intel i5 CPU, why is it taking so long? I terminated the process and tried computing the 40th term. It took about a second. I put a check and was shocked to find that the above recursive function was called 204,668,309 times while computing the 40th term. More than 200 million times? Is it reporting function calls or scam of some government? The Dynamic Programming solution computes 100th Fibonacci term in less than fraction of a second, with a single function call, taking linear time and constant extra memory. A recursive solution, usually, neither pass all test cases in a coding competition, nor does it impress the interviewer in an interview of company like Google, Microsoft, etc. The most difficult questions asked in competitions and interviews, are from dynamic programming. This book takes Dynamic Programming head-on. It first explain the concepts with simple examples and then deep dives into complex DP problems.


Dynamic Programming for Coding Interviews
Language: en
Pages: 142
Authors: Meenakshi, Kamal Rawat
Categories: Computers
Type: BOOK - Published: 2017-01-18 - Publisher: Notion Press
I wanted to compute 80th term of the Fibonacci series. I wrote the rampant recursive function, int fib(int n){ return (1==n || 2==n) ? 1 : fib(n-1) + fib(n-2); } and waited for the result. I wait… and wait… and wait… With an 8GB RAM and an Intel i5 CPU, why is it taking so long? I terminated the process and tried computing the 40th term. It took about a second. I put a check and was shocked to find that the above recursive function was called 204,668,309 times while computing the 40th term. More than 200 million times? Is it reporting function calls or scam of some government? The Dynamic Programming solution computes 100th Fibonacci term in less than fraction of a second, with a single function call, taking linear time and constant extra memory. A recursive solution, usually, neither pass all test cases in a coding competition, nor does it impress the interviewer in an interview of company like Google, Microsoft, etc. The most difficult questions asked in competitions and interviews, are from dynamic programming. This book takes Dynamic Programming head-on. It first explain the concepts with simple examples and then deep dives into complex DP problems.
String Algorithms for the Day Before Your Coding Interview
Language: en
Pages: 40
Authors: Ue Kiao, Aditya Chatterjee
Categories: Computers
Type: BOOK - Published: 2020-05-11 - Publisher:
Strings are fundamental data type in real world and developing algorithms to deal with it is an important domain. In interviews, often, string algorithms are most insightful and challenging.In this guide for the day before your coding interview, we have explored some problems and demonstrated the thought process to solve it starting from the brute force solutions. In the process, we have covered all fundamental ideas along with applying Dynamic Programming to String algorithms so that you are able to solve all string-based problems. Some of the problems we have covered are: - Check substring: This is an important fundamental problem where we learn how strings can be handled just like numeric data and algorithms for numeric data can be leveraged.Some of the core concepts we explored are string hashing, rolling hash and much more.- Longest common substring: This is a core problem as this uses the concepts we gained in the previous problems and an alternative solution is to use Dynamic Programming.The core idea is to apply Dynamic Programming over two different string data.- Longest repeating substring: In line with our previous problem, we explored how to apply Dynamic Programming for this problem. The key distinction is that we
Dynamic Programming for the Day Before Your Coding Interview
Language: en
Pages: 52
Authors: Ue Kiao, Aditya Chatterjee
Categories: Computers
Type: BOOK - Published: 2020-04-28 - Publisher:
Dynamic Programming is a fundamental algorithmic technique which is behind solving some of the toughest computing problems.In this book, we have covered some Dynamic Programming problems which will give you the general idea of formulating a Dynamic Programming solution and some practice on applying it on a variety of problems.Some of the problems we have covered are: * Permutation coefficientThis is a basic problem but is significant in understanding the idea behind Dynamic Programming. We have used this problem to: * Present the two core ideas of Dynamic Programming to make the idea clear and help you understand what Dynamic Programming mean. * Show another approach which can same performance (in terms of time complexity) and understand how it is different from our Dynamic Programming approach* Longest Common SubstringThis is an important problem as we see how we can apply Dynamic Programming in string problems. In the process, we have demonstrated the core ideas of handling string data which helps in identifying the cases when Dynamic Programming is the most efficient approach.* XOR valueThis is another significant problem as we are applying Dynamic Programming on a Number Theory problem more specifically problem involving subset generation. The search space is exponential
Graph Algorithms for the Day Before Your Coding Interview
Language: en
Pages: 46
Authors: Ue Kiao, Aditya Chatterjee
Categories: Computers
Type: BOOK - Published: 2020-06-07 - Publisher:
Graph Algorithms are fundamentally important and different than other Algorithmic domains as it gives an inherent structure to the data and we operate on it. This is one of the most important domains for Coding Interviews focused on problem solving.Following are some of the problems we have explored which involve ideas to solve a wider range of problems: - All paths between two verticesThis is a fundamental problem as modifications to it results in solving a wide range of problems. In the process of formulating a solution, we have explored core ideas like graph traversal techniques like Depth First Search and Graph representation like Adjacency List.- Mother VertexThis is an important problem as it highlights two key ideas of Graph problems that is connectivity and importance of specific vertices.We have solved this problem using two approaches where the efficient approach is a modification of Depth First Search and takes O(V^2) time complexity.- Paths with K edgesThis is an important problem as it demonstrates how we can utilize ideas from Dynamic Programming and Divide and Conquer to solve Graph Problems.We have demonstrated four approaches where the brute force approach takes O(2^V x V) time, improving it with a structure we get
Problems for the day before your coding interview
Language: en
Pages: 52
Authors: Aditya Chatterjee, Ue Kiao
Categories: Computers
Type: BOOK - Published: 2020-03-23 - Publisher: OpenGenus
If you have an upcoming coding interview, this is a must for you to read this book 💪 and get prepared to tackle ALGORITHM and DATA STRUCTURE problems in a day. In this book, we have solved insightful algorithmic problems and discussed some of the best insights to drive you into the problem solving mindset. Being in a mindset required for an upcoming event is like winning half the battle. In this book, we begin with an easy problem and go on to explore some tough and insightful problems. The first problem we presented is to delete minimum number of digits in a number to make it a perfect square. This might seem to be a simple problem but the insights involved in solving this is widely applicable across various Algorithmic problems. This problem is solved in time complexity of O(N ^ (1/3) x logN x logN) (think how?) Moreover, in solving the above problem, we have learnt how to generate all combinations/ subsets of a set efficiently. In this line, we have covered other ideas related to combination and permutation generation in other problems in this book. Some of the ideas we covered in the other problems are: *
Coding Interview Questions
Language: en
Pages: 496
Authors: Narasimha Karumanchi
Categories: Computers
Type: BOOK - Published: 2012-05 - Publisher:
"Coding Interview Questions" is a book that presents interview questions in simple and straightforward manner with a clear-cut explanation. This book will provide an introduction to the basics. It comes handy as an interview and exam guide for computer scientists. Programming puzzles for interviews Campus Preparation Degree/Masters Course Preparation Big job hunters: Apple, Microsoft, Google, Amazon, Yahoo, Flip Kart, Adobe, IBM Labs, Citrix, Mentor Graphics, NetApp, Oracle, Webaroo, De-Shaw, Success Factors, Face book, McAfee and many more Reference Manual for working people Topics Covered: Programming BasicsIntroductionRecursion and BacktrackingLinked Lists Stacks Queues Trees Priority Queue and HeapsGraph AlgorithmsSortingSearching Selection Algorithms [Medians] Symbol TablesHashing String Algorithms Algorithms Design Techniques Greedy Algorithms Divide and Conquer Algorithms Dynamic Programming Complexity Classes Design Interview Questions Operating System Concepts Computer Networking Basics Database Concepts Brain Teasers NonTechnical Help Miscellaneous Concepts Note: If you already have "Data Structures and Algorithms Made Easy" no need to buy this.
C IN 7 DAYS for CODING INTERVIEWS
Language: en
Pages: 232
Authors: Meenakshi, Kamal Rawat
Categories: Education
Type: BOOK - Published: 2016-12-30 - Publisher: Notion Press
In my career spanning more than a decade, I have used C language in only two projects. All these years, I had either coded in C++, Java or C#. However, during interviews, I had always coded my solutions in C. When an interviewer asks you to implement a Stack having one extra operation, getMinimum that returns minimum element in current stack, you are expected to give your own implementation of stack from scratch and not use Stack class in Java library. C language allows your solution to be focused on the problem without unnecessary clutter of class and object definitions. Java and C# are good to showcase your design skills, but if the question is not explicitly about object-oriented design, C (or C++) provides flexibility to demonstrate your memory management skills and help implement everything required using data structure and algorithms. C is a lightweight language and is easy to learn in a short span of time. Understanding the internals of C helps comprehend other high-level languages better because nthe concepts and terminology remain the same. This book gives you an insight into the journey that your code goes through and best practices at each stage.
Mathematical Algorithms for the Day Before Your Coding Interview
Language: en
Pages: 52
Authors: Ue Kiao, Aditya Chatterjee
Categories: Education
Type: BOOK - Published: 2020-05-31 - Publisher:
Mathematical Algorithms are fundamentally important as several real-life problems can be modeled as a Mathematical problem. Solving such problems require mathematical insights.These problems are a fundamental part of Interviews as it illustrates the thinking process of the candidate clearly. By going through the problems in this book, you will be well prepared to tackle any Mathematical problem.Following are some of the problems we have explored which involve ideas to solve a wider range of problems.- Smallest number with multiplesThis is a unique problem where we learn key insights regarding Prime factorization, role of primes in multiples and much more.We improve the time complexity of this problem starting from O(N^3 * log N) to O(N * log N * log N) to O(N * log log N).- Largest palindromeIn this problem, we have reduced 810000 comparisons to 362 comparisons based on three deep insights. This is a dramatic improvement and demonstrates that even if time complexity cannot be improved, the performance can be improved significantly.- GCD of sub-partsThis problem brings up key insights involving GCD (a common and important topic) and in the process, we have explored several standard algorithms like Euclidean' s GCD Algorithm in the path of developing our
Algorithmen und Datenstrukturen
Language: de
Pages: 780
Authors: Thomas Ottmann, Peter Widmayer
Categories: Computers
Type: BOOK - Published: 2011-12-27 - Publisher: Springer-Verlag
Dieses bestens eingeführte Lehrbuch wendet sich an Studierende der Informatik in Grund- und Hauptstudium. Es behandelt gut verständlich alle Themen, die üblicherweise in der Standardvorlesung "Algorithmen und Datenstrukturen” vermittelt werden. Die einzelnen Algorithmen werden theoretisch fundiert dargestellt; ihre Funktionsweise wird ausführlich anhand vieler Beispiele erläutert. Zusätzlich zur halbformalen Beschreibung werden wichtige Algorithmen in Java formuliert. Das Themenspektrum reicht von Algorithmen zum Suchen und Sortieren über Hashverfahren, Bäume, Manipulation von Mengen bis hin zu Geometrischen Algorithmen und Graphenalgorithmen. Dabei werden sowohl der Entwurf effizienter Algorithmen und Datenstrukturen als auch die Analyse ihres Verhaltens mittels mathematischer Methoden behandelt. Durch eine übersichtliche Gliederung, viele Abbildungen und eine präzise Sprache gelingt den Autoren in vorbildlicher Weise die Vermittlung des vielschichtigen Themengebiets. Die 5. Auflage ist vollständig durchgesehen und überarbeitet. Neu aufgenommen wurden Einführungen in die Themen Dynamisches Programmieren, Backtracking, Onlinealgorithmen, Approximationsalgorithmen sowie einige Algorithmen für spezielle Probleme wie die schnelle Multiplikation von Matrizen, von ganzen Zahlen, und die Konstruktion der konvexen Hülle von Punkten in der Ebene. Das Buch eignet sich zur Vorlesungsbegleitung, zum Selbststudium und zum Nachschlagen. Eine Vielzahl von Aufgaben dient der weiteren Vertiefung des Gelernten. Unter http://ad.informatik.uni-freiburg.de/bibliothek/books/ad-buch/ werden Java-Programme für die wichtigsten Algorithmen und ergänzende Materialien zum Buch bereitgestellt.
Datenintensive Anwendungen designen
Language: de
Pages: 652
Authors: Martin Kleppmann
Categories: Computers
Type: BOOK - Published: 2018-11-26 - Publisher: O'Reilly
Daten stehen heute im Mittelpunkt vieler Herausforderungen im Systemdesign. Dabei sind komplexe Fragen wie Skalierbarkeit, Konsistenz, Zuverlässigkeit, Effizienz und Wartbarkeit zu klären. Darüber hinaus verfügen wir über eine überwältigende Vielfalt an Tools, einschließlich relationaler Datenbanken, NoSQL-Datenspeicher, Stream-und Batchprocessing und Message Broker. Aber was verbirgt sich hinter diesen Schlagworten? Und was ist die richtige Wahl für Ihre Anwendung? In diesem praktischen und umfassenden Leitfaden unterstützt Sie der Autor Martin Kleppmann bei der Navigation durch dieses schwierige Terrain, indem er die Vor-und Nachteile verschiedener Technologien zur Verarbeitung und Speicherung von Daten aufzeigt. Software verändert sich ständig, die Grundprinzipien bleiben aber gleich. Mit diesem Buch lernen Softwareentwickler und -architekten, wie sie die Konzepte in der Praxis umsetzen und wie sie Daten in modernen Anwendungen optimal nutzen können. Inspizieren Sie die Systeme, die Sie bereits verwenden, und erfahren Sie, wie Sie sie effektiver nutzen können Treffen Sie fundierte Entscheidungen, indem Sie die Stärken und Schwächen verschiedener Tools kennenlernen Steuern Sie die notwenigen Kompromisse in Bezug auf Konsistenz, Skalierbarkeit, Fehlertoleranz und Komplexität Machen Sie sich vertraut mit dem Stand der Forschung zu verteilten Systemen, auf denen moderne Datenbanken aufbauen Werfen Sie einen Blick hinter die Kulissen der wichtigsten Onlinedienste und lernen Sie von deren Architekturen