课程信息

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This course covers the essential information that every serious programmer needs to know about algorithms and data structures, with emphasis on applications and scientific performance analysis of Java implementations. Part I covers elementary data structures, sorting, and searching algorithms. Part II focuses on graph- and string-processing algorithms.
All the features of this course are available for free. It does not offer a certificate upon completion.

立即开始，按照自己的计划学习。

根据您的日程表重置截止日期。

建议：6 weeks of study, 6–10 hours per week....

字幕：英语（English）, 韩语

GraphsData StructureAlgorithmsData Compression

立即开始，按照自己的计划学习。

根据您的日程表重置截止日期。

建议：6 weeks of study, 6–10 hours per week....

字幕：英语（English）, 韩语

周

1Welcome to Algorithms, Part II....

1 个视频 （总计 9 分钟）, 2 个阅读材料

Welcome to Algorithms, Part II1分钟

Lecture Slides

We define an undirected graph API and consider the adjacency-matrix and adjacency-lists representations. We introduce two classic algorithms for searching a graph—depth-first search and breadth-first search. We also consider the problem of computing connected components and conclude with related problems and applications....

6 个视频 （总计 98 分钟）, 2 个阅读材料, 1 个测验

Graph API14分钟

Depth-First Search26分钟

Breadth-First Search13分钟

Connected Components18分钟

Graph Challenges14分钟

Overview1分钟

Lecture Slides

Interview Questions: Undirected Graphs (ungraded)6分钟

In this lecture we study directed graphs. We begin with depth-first search and breadth-first search in digraphs and describe applications ranging from garbage collection to web crawling. Next, we introduce a depth-first search based algorithm for computing the topological order of an acyclic digraph. Finally, we implement the Kosaraju−Sharir algorithm for computing the strong components of a digraph....

5 个视频 （总计 68 分钟）, 1 个阅读材料, 2 个测验

Digraph API4分钟

Digraph Search20分钟

Topological Sort 12分钟

Strong Components20分钟

Lecture Slides

Interview Questions: Directed Graphs (ungraded)6分钟

周

2In this lecture we study the minimum spanning tree problem. We begin by considering a generic greedy algorithm for the problem. Next, we consider and implement two classic algorithm for the problem—Kruskal's algorithm and Prim's algorithm. We conclude with some applications and open problems....

6 个视频 （总计 85 分钟）, 2 个阅读材料, 1 个测验

Greedy Algorithm12分钟

Edge-Weighted Graph API11分钟

Kruskal's Algorithm12分钟

Prim's Algorithm33分钟

MST Context10分钟

Overview1分钟

Lecture Slides

Interview Questions: Minimum Spanning Trees (ungraded)6分钟

In this lecture we study shortest-paths problems. We begin by analyzing some basic properties of shortest paths and a generic algorithm for the problem. We introduce and analyze Dijkstra's algorithm for shortest-paths problems with nonnegative weights. Next, we consider an even faster algorithm for DAGs, which works even if the weights are negative. We conclude with the Bellman−Ford−Moore algorithm for edge-weighted digraphs with no negative cycles. We also consider applications ranging from content-aware fill to arbitrage....

5 个视频 （总计 85 分钟）, 1 个阅读材料, 2 个测验

Shortest Path Properties14分钟

Dijkstra's Algorithm18分钟

Edge-Weighted DAGs19分钟

Negative Weights21分钟

Lecture Slides

Interview Questions: Shortest Paths (ungraded)6分钟

周

3In this lecture we introduce the maximum flow and minimum cut problems. We begin with the Ford−Fulkerson algorithm. To analyze its correctness, we establish the maxflow−mincut theorem. Next, we consider an efficient implementation of the Ford−Fulkerson algorithm, using the shortest augmenting path rule. Finally, we consider applications, including bipartite matching and baseball elimination....

6 个视频 （总计 72 分钟）, 2 个阅读材料, 2 个测验

Ford–Fulkerson Algorithm6分钟

Maxflow–Mincut Theorem9分钟

Running Time Analysis8分钟

Java Implementation14分钟

Maxflow Applications22分钟

Overview

Lecture Slides

Interview Questions: Maximum Flow (ungraded)6分钟

In this lecture we consider specialized sorting algorithms for strings and related objects. We begin with a subroutine to sort integers in a small range. We then consider two classic radix sorting algorithms—LSD and MSD radix sorts. Next, we consider an especially efficient variant, which is a hybrid of MSD radix sort and quicksort known as 3-way radix quicksort. We conclude with suffix sorting and related applications....

6 个视频 （总计 85 分钟）, 1 个阅读材料, 1 个测验

Strings in Java17分钟

Key-Indexed Counting12分钟

LSD Radix Sort15分钟

MSD Radix Sort13分钟

3-way Radix Quicksort7分钟

Suffix Arrays19分钟

Lecture Slides

Interview Questions: Radix Sorts (ungraded)6分钟

周

4In this lecture we consider specialized algorithms for symbol tables with string keys. Our goal is a data structure that is as fast as hashing and even more flexible than binary search trees. We begin with multiway tries; next we consider ternary search tries. Finally, we consider character-based operations, including prefix match and longest prefix, and related applications....

3 个视频 （总计 75 分钟）, 2 个阅读材料, 1 个测验

Overview10分钟

Lecture Slides

Interview Questions: Tries (ungraded)6分钟

In this lecture we consider algorithms for searching for a substring in a piece of text. We begin with a brute-force algorithm, whose running time is quadratic in the worst case. Next, we consider the ingenious Knuth−Morris−Pratt algorithm whose running time is guaranteed to be linear in the worst case. Then, we introduce the Boyer−Moore algorithm, whose running time is sublinear on typical inputs. Finally, we consider the Rabin−Karp fingerprint algorithm, which uses hashing in a clever way to solve the substring search and related problems....

5 个视频 （总计 75 分钟）, 1 个阅读材料, 2 个测验

Brute-Force Substring Search10分钟

Knuth–Morris–Pratt33分钟

Boyer–Moore8分钟

Rabin–Karp16分钟

Lecture Slides10分钟

Interview Questions: Substring Search (ungraded)6分钟

周

5A regular expression is a method for specifying a set of strings. Our topic for this lecture is the famous grep algorithm that determines whether a given text contains any substring from the set. We examine an efficient implementation that makes use of our digraph reachability implementation from Week 1....

5 个视频 （总计 83 分钟）, 2 个阅读材料, 1 个测验

REs and NFAs13分钟

NFA Simulation18分钟

NFA Construction11分钟

Regular Expression Applications20分钟

Overview10分钟

Lecture Slides10分钟

Interview Questions: Regular Expressions (ungraded)6分钟

We study and implement several classic data compression schemes, including run-length coding, Huffman compression, and LZW compression. We develop efficient implementations from first principles using a Java library for manipulating binary data that we developed for this purpose, based on priority queue and symbol table implementations from earlier lectures....

4 个视频 （总计 80 分钟）, 1 个阅读材料, 2 个测验

Run-Length Coding5分钟

Huffman Compression24分钟

LZW Compression27分钟

Lecture Slides10分钟

Interview Questions: Data Compression (ungraded)6分钟

周

6Our lectures this week are centered on the idea of problem-solving models like maxflow and shortest path, where a new problem can be formulated as an instance of one of those problems, and then solved with a classic and efficient algorithm. To complete the course, we describe the classic unsolved problem from theoretical computer science that is centered on the concept of algorithm efficiency and guides us in the search for efficient solutions to difficult problems. ...

4 个视频 （总计 40 分钟）, 2 个阅读材料, 1 个测验

Designing Algorithms8分钟

Establishing Lower Bounds9分钟

Classifying Problems12分钟

Overview10分钟

Lecture Slides10分钟

Interview Questions: Reductions (ungraded)6分钟

The quintessential problem-solving model is known as linear programming, and the simplex method for solving it is one of the most widely used algorithms. In this lecture, we given an overview of this central topic in operations research and describe its relationship to algorithms that we have considered....

4 个视频 （总计 61 分钟）, 1 个阅读材料, 1 个测验

Brewer's Problem21分钟

Simplex Algorithm11分钟

Simplex Implementations16分钟

Linear Programming Reductions11分钟

Lecture Slides10分钟

Interview Questions: Linear Programming (ungraded)6分钟

Is there a universal problem-solving model to which all problems that we would like to solve reduce and for which we know an efficient algorithm? You may be surprised to learn that we do no know the answer to this question. In this lecture we introduce the complexity classes P, NP, and NP-complete, pose the famous P = NP question, and consider implications in the context of algorithms that we have treated in this course....

6 个视频 （总计 85 分钟）, 1 个阅读材料, 1 个测验

Search Problems10分钟

P vs. NP16分钟

Classifying Problems13分钟

NP-Completeness12分钟

Coping with Intractability 14分钟

Lecture Slides10分钟

Interview Questions: Intractability (ungraded)6分钟

5.0

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创建者 IO•Jan 21st 2018

Pretty challenging course, but very good. Having a book is a must (at least it was for me), video lectures complement book nicely, and some topics are explained better in the Algorithms, 4th ed. book.

创建者 AK•Apr 17th 2019

Amazing course! Loved the theory and exercises! Just a note for others: Its part 1 had almost no dependency on book, but this part 2 has some dependency (e.g. chapter on Graph) on book as well.

Princeton University is a private research university located in Princeton, New Jersey, United States. It is one of the eight universities of the Ivy League, and one of the nine Colonial Colleges founded before the American Revolution....

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Do I need to pay for this course?

No. All features of this course are available for free.

Can I earn a certificate in this course?

No. As per Princeton University policy, no certificates, credentials, or reports are awarded in connection with this course.

I have no familiarity with Java programming. Can I still take this course?

Our central thesis is that algorithms are best understood by implementing and testing them. Our use of Java is essentially expository, and we shy away from exotic language features, so we expect you would be able to adapt our code to your favorite language. However, we require that you submit the programming assignments in Java.

Which algorithms and data structures are covered in this course?

Part II focuses on graph and string-processing algorithms. Topics include depth-first search, breadth-first search, topological sort, Kosaraju−Sharir, Kruskal, Prim, Dijkistra, Bellman−Ford, Ford−Fulkerson, LSD radix sort, MSD radix sort, 3-way radix quicksort, multiway tries, ternary search tries, Knuth−Morris−Pratt, Boyer−Moore, Rabin−Karp, regular expression matching, run-length coding, Huffman coding, LZW compression, and the Burrows−Wheeler transform.

Part I focuses on elementary data structures, sorting, and searching. Topics include union-find, binary search, stacks, queues, bags, insertion sort, selection sort, shellsort, quicksort, 3-way quicksort, mergesort, heapsort, binary heaps, binary search trees, red−black trees, separate-chaining and linear-probing hash tables, Graham scan, and kd-trees.

What kinds of assessments are available in this course?

Weekly programming assignments and interview questions.

The programming assignments involve either implementing algorithms and data structures (graph algorithms, tries, and the Burrows–Wheeler transform) or applying algorithms and data structures to an interesting domain (computer graphics, computational linguistics, and data compression). The assignments are evaluated using a sophisticated autograder that provides detailed feedback about style, correctness, and efficiency.

The interview questions are similar to those that you might find at a technical job interview. They are optional and not graded.

I am/was not a Computer Science major. Is this course for me?

This course is for anyone using a computer to address large problems (and therefore needing efficient algorithms). At Princeton, over 25% of all students take the course, including people majoring in engineering, biology, physics, chemistry, economics, and many other fields, not just computer science.

How does this course differ from Design and Analysis of Algorithms?

The two courses are complementary. This one is essentially a programming course that concentrates on developing code; that one is essentially a math course that concentrates on understanding proofs. This course is about learning algorithms in the context of implementing and testing them in practical applications; that one is about learning algorithms in the context of developing mathematical models that help explain why they are efficient. In typical computer science curriculums, a course like this one is taken by first- and second-year students and a course like that one is taken by juniors and seniors.

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