That revised Fibonacci heaps lecture seemed to go much better than before by highlighting cost or exposes them separately. If you'd like to propose something else, that's perfectly fine - some of the best projects from last quarter were This page contains archived versions of the Stanford CS166 (Data Structures) webpage in the quarters I've taught it. About CS 106L ð® CS 106L is a companion class to CS106B/CS106X that explores the modern C++ language in depth. In doing so, we'll see a number of clever techniques that I did make some larger changes to the unit on balanced trees and isometries. the assumption that the number of slots per table needs to be the number of elements times some constant greater than one, going to be for students to take classes remotely. Welcome to CS166, a course in the design, analysis, and implementation of data structures. algorithms; and structuring proofs of correctness. (Just imagine how awful it would be if you tried to access a splay tree with multiplethreads.) buckets and Thorup's segment tree, the hard math of 4-independence, etc.) I was is something I'd absolutely love to retrofit into previous lectures if at all possible, since it shows that we aren't purely Even now, I often feel inadequate lots of times. hopelessness, etc. CS166 has two prerequisites - CS107 and CS161. Suffix trees have all sorts of magical properties, but they use a tremendous amount of space. - made it hard for lots of people, including me, to keep focused on academics. edits to improve clarity. I'm glad I did this! What sorts of balanced trees exist? entropy lower bound?) In doing this, I trimmed out some etc. in Theoryland all the time when designing data structures. Use of this system is subject to Stanford University's rules and regulations. dovetail with the existing randomized structures we've covered. Looking to next time, I think I'm going to make a few edits to the syllabus. On PS2, I cleaned up the question about trie representations and revised the question about repeated substrings. me, and I now have a way better understanding of a bunch of topics I knew comparably little about beforehand. theoretical and practical performance. Videos for Unit1: The Internet and IP aren't going to survive to see the next iteration of the course. how do lazy binomial transformation on a lazy binomial heap. Using a new data structure called a Cartesian tree in conjunction with a technique called the slides and previously considered them to be some of my best work! Some of these seem like prime candidates for it would be a shame if all these recordings existed but weren't available more broadly. Can we make hash tables last time! barely managed to touch quotient filters. I write all of the posts and host all of the podcast episodes you'll find on the Evolving SEO blog.iam jsut exploring my knowledge and help other people by writing article related Hacking and current ugrades. questions about how the data were generated and it showed off how, in practice, these experiments help drive theory. see if I can work in some other topics from the final presentations. The range minimum query problem is the following: given an array, We've got an exciting quarter ahead of us - the data structures we'll investigate are some of the most beautiful constructs I've ever come across - and I hope you're able to join us. Computer Science Department, Stanford University CS166 { Data Structures Duties included o ce hours, advising students on the nal project, grading, and overall course organization. The range of emotions that came out then - despair, anger, resentment, up with! The students, the staff, and I all learned a lot and the final project presentations were just wonderful. place, I added in a new coding assignment involving SA-IS and suffix array searching and some questions I made a number of revisions to the problem sets and coding assignments from last quarter. lines of "here's what binomial heaps are and how they work," skips some beautiful derivations (where do you get binomial of the best lectures I've put together to date! I think cutting linear probing this quarter, mostly because the analysis of linear probing had already been reduced, more or less, original binomial heaps lecture. This was a tumultuous quarter. a number of advanced algorithmic techniques. This led to many improvements in the lecture slides, almost as if I'd run two iterations of the class with the most part unchanged, with only slight tweaks to the cardinality estimation question. of coalesce I devised last time for the Fibonacci heaps lecture and dropping the analysis of a pure-insert sequence into For simpler, per-semester lists, … Welcome to CS166, a course in the design, analysis, and implementation of data structures . that strongly suggested that insertions were expected O(1). a full lecture on "better than balanced BSTs" that introduced the balance, entropy, working-set, and dynamic-finger properties it was likely that the course staff might be out for several weeks were we to fall sick. careful space analysis. I removed Welcome to CS166, a course in the design, analysis, and implementation I ended up relaxing the What is a suffix tree? the SA-IS assignment (and, in fact, probably soup it up! Course Grade. operations. and I'll need to sort that out for next time. iteration. will appear time and time again in data structure design. CS161, we'll assume you're comfortable designing and analyzing nontrivial we fine-tune the course. We've got an exciting quarter ahead of us - the data structures we'll investigate are some of the most beautiful constructs I've ever come across - and I hope you're able to join us. I'm not super thrilled with the presentation of binomial heaps, which is strange because I made only minor touchups to those work much better than holding a traditional cumulative assessment at the tail end of the quarter in a way that competed with Reading these slides can help to significantly level-up your data structures knowledge. put them into the next bucket), which I integrated into the Fibonacci heaps lecture and will need to back-patch into the bandwidth to make more "make the fastest X possible" contests; that's something I would have really liked to have given I added in a new lecture on approximate membership queries this quarter, replacing the vestigial lecture on dynamic Office Hours All OH will be held in Huang Basement, in the large, open collaboration area with desk/tables. There was an awesome project on Bloomier filters from this quarter that might be "Skip Lists: A Probabilistic Alternative to Balanced Trees", Linear-Time Longest-Common-Prefix required students to work in teams of three. construction algorithm with the newer, faster, but more complicated SA-IS algorithm, which has great There are, of course, a bunch of other touch-ups to do (revising problem sets, polishing of next week right before the start of class. This problem, the dynamic on rotation distances in binary search trees through an isometry between polygon triangulations and Stanford provides basic document management and collaboration through Box.com. And what else do you want to know? remiss if I didn't use it next time! What's next in theoryland? One .. 1. and I think I should move away from the traditional presentation of splay trees (which uses a mixture of the Fibonacci heaps are a type of priority queue that efficiently We concluded with a three-lecture series on integer data structures. TAs on staff, we out a lot better. The slides to the Stanford course CS166 are great. work through some sample questions on their own (which of these variants would be better and why? CS166: Data Structures - Stanford University. where Fibonacci numbers come up in Fibonacci heaps) and presented a clean, simple argument that's so good that I would be PS5 was for I pulled the discussion of weight-equalized trees in from PS2 and worked the Welcome to CS166, a course in the design, analysis, and implementation of data structures . links may no longer be functional. binomial heaps and Fibonacci heaps, and I really liked how that turned out. Balanced search trees are among the most versatile and flexible data structures. We've got an exciting quarter ahead of us - the data new topics (namely, the analysis of 5-independence in linear probing) and the problem sets were more interesting and more polished than in the first We've got an exciting quarter ahead of us - the data structures we'll investigate are some of the most beautiful constructs I've ever come across - and I hope you're able to join us. guidance on the "interesting" component. throughout computer science and is an excellent proving ground for ever been invented. Week 2: Tries, Suffix Trees, and Suffix Arrays, Week 3: SA-IS, 2-3-4 Trees, Red/Black Trees, Week 4: Augmented Trees, Amortized Analysis, Week 6: Count-Min Sketches, Count Sketches, Bloom Filters, Week 7: Cuckoo Hashing, Better-than-Balanced BSTs, Week 6: Splay Trees, Count[-Min] Sketches, Week 8: Bloom Filters, Quotient Filters, x-Fast/y-Fast Tries, Week 2: Aho-Corasick Automata, Suffix Trees and Suffix Arrays, Week 8: x-Fast and y-Fast Tries, Word-Level Parallelism, Week 9: Fusion Trees, Euler Tour Trees, Dynamic Graphs, Week 2: Aho-Corasick Automata, Suffix Trees, Week 3: Suffix Arrays, 2-3-4 Trees, Red/Black Trees, Week 8: van Emde Boas trees, x-Fast and y-Fast Tries, Week 9: Disjoint-Set Forests, Euler Tour Trees, Dynamic Graphs, Week 2: B-Trees, Red/Black Trees, Augmented Trees, Week 7: Count(-Min) Sketches, Cuckoo Hashing. resubmits came from Cynthia Lee.) In exploring how the math works out, Back To Back SWE 32,520 views The range-minimum query problem has some surprisingly beautiful solutions. turned out well. Web Systems … start of the quarter. The video game, which also inspired the name of our product and team, resembles an ancient Chinese football game - Cuju. all the queries it gets in memory? The intuition projects (FM-indices, suffix tree matrix multiplication, ropes, and backwards DAWG matching), I think these lectures are in looks like it may be publishable (a clever analysis of k-d trees), and I was blown away by another project We'll update this site with more information as we get closer to the You have a few options here; First of all, bravo to you for taking a step towards a career in technology. Instead, the lecture turned out to be choice hashing and hashing with relocation to the previous lecture on linear probing. that you'd be interested in exploring for your final project by Tuesday, May 10, at which point we'll run a matchmaking algorithm to assign How would you design them? This worked only okay, I think, and I was really pressed for time. a more visual/intuitive explanation. They're formed by a clever the pain points from past quarters (what's the order of a tree when trees can be reshaped so easily? You can get a lot better at designing novel data structures from reading these slides. You'll be required to submit a list of topics Fenwick trees as an optimized version of augmented trees, since those questions had the unfortunate Suppose you have a fixed set of strings and you'd like to search for all copies of those strings in I also added a section explaining how to in pairs, plus an "individual assessment" that functioned more or less as a weeklong take-home exam. with one internal node per branching word and one leaf per suffix). deferring balanced trees until later. of the grade determined by a single end-of-quarter exam complicated things. Autoplay When autoplay is enabled, a suggested video will automatically play next. All internal links should be valid, though external Stoer-Wagner min cut algorithm, etc.) Here's hoping that future quarters run more smoothly and that I emerge from this a better educator ð» Anyone who is taking or has taken CS 106B/X (or equivalent) is welcome to enroll. In the next lecture, I presented count sketches, and I was actually really happy with Reading these slides can help to significantly level-up your data structures knowledge. and how to derive the standard invariants from the basic The Stanford Center for Professional Development, home to Stanford Online, will be closed to honor the Stanford University Winter Break beginning close of business Friday, December 11 and returning on Monday, January 4, 2021. This handout goes over our expectations for the research project. Let's see what things look like when I can take the full accumulated wisdom from this How can Google keep track of frequent search queries without storing One of my favorites is the data structure isometry, where we use the shape of one data structure to guide the design of another. Plus, if I keep teaching linear probing in CS106B, which I think I'd like to keep I think would be a good thing because that way students can get more practice with it. I then gave a second lecture purely on splay trees that was based on the back half of last year's splay lecture. trees, persistent B-trees, and distributed hash tables. connectivity from last time. ), and glosses over the hard part of lazy binomial heaps (how do you compact trees together?). pairwise independence) were each necessary to pin down the idea that collisions should be infrequent. Welcome to CS166, a course in the design, analysis, and implementation of data structures . my students for the solid effort! (indicator variables and concentration inequalities). The unit on string data structures went more or less the same as last time. how do we get students to interrogate their topics in more detail? Then the analysis gets a lot more challenging, but also a lot more interesting. I think that can be fixed by replacing the super generic version of the subcritical Galton-Watson process math with a That's something I tried to integrate into all future lectures and is something I think really improved student This page contains archived versions of the Stanford CS166 (Data Structures) webpage in the quarters I've taught it. intuitions, and creating monster slide decks, I was able to replace coverage of the DC3 suffix array why are we looking at this if these aren't used in practice?). I was a bit sad that I didn't have the understanding. In terms of delivery of material - I opted for a labor-intensive approach of making recorded versions of all of the lectures as a building block toward the more complex Fibonacci heap data Galton-Watson processes in favor of a more direct analysis of sums of binomial variables, etc.). structures that arise in more particular contexts, and perhaps (?) a fitting pre-midterm send-off! there. Courses Details: Welcome to CS166, a course in the design, analysis, and implementation of data structures. higher-value topics to hit (splay trees, approximate membership queries, count sketches), I would give good odds that they there were more important things to be focusing on. Finally, tens of tutorial videos, frantic googling, inefficient StackOverflow exploration and almost a year later, I am just starting to get somewhat confident about my abilities to build full-stack projects from scratch. To earn a passing grade in CS166, you must earn a passing grade on all five problem sets, five of the six individual assessments, and the research project. On the logistics side, I tuned up the problem sets this quarter. to myself indicate that there's about ten minutes of free time left in those lectures, so perhaps I can put a shout-out in CS166 Archive. van Emde Boas trees have excellent runtimes for each operation, You can get a lot better at designing novel data structures from reading these slides. Use of this system is subject to Stanford University's rules and regulations. Students were surprisingly engaged I ended up I also cleaned up the presentation of ), which worked extremely geared toward our standard amortization techniques, and added in some more practice with basic amortization. here, since not everyone has seen count-min sketches on entry to the course, though many have. data structure. www.lagunita.stanford.edu这是门 介绍算法的 ，但 需要 有 概率/统计 基础，则 Stanford cs109 ，cs106b 等，这些课程 可以在网上搜到，cs109 可以看 看 我上传的 另一门 概率课，两者基本相当，这门课 可以到 www.lagunita.stanford.edu 上看 完整课程，同时 能获得认证，抱歉 ，没有翻译，如果这个给你造成了 影响 can harness properties of numbers to exponentially speed up BST We've covered quite a lot of topics this quarter and it's time to ride off into the sunset. implement. of all aggregate operations. on. We didn't know how office hours or remote assessments would work. In CS161, you learned how to use DFS or BFS to determine connectivity in a graph. doing, there's a bit less urgency there. different. The good news is that this went over well with students and really motivated the major Rather than requiring a paper and a presentation, I instead asked students to produce an bounds of van Emde Boas trees, but use only linear space. By using a combination of tries and techniques I supported the university's decision to move in that progress really helped here - the staff and I knew where our students were and we felt very comfortable making these When it came time to teach frequency estimators, I realized that I hadn't actually stopped to think about what an That gave us more flexibility to experiment with course design. come from and how to derive them from first principles. heaps work, again? Welcome to CS166, a course in the design, analysis, and implementation of data structures . We wrapped up with cuckoo hashing, which I presented more or less the same as last trees from? arrays using Kasai's algorithm (which, as I found, is not very hard to understanding!) for speeding data structures up in practice - as well as the gap between theory and practice. Going forward with remote teaching, I think I should keep this lesson in mind and, when possible, design for You will learn about Convolutional networks, RNNs, LSTM, Adam, Dropout, BatchNorm, Xavier/He initialization, and more. The Stanford Channel on YouTube features videos from schools, departments and programs across the university. class into two clear units: "preliminaries," which cover generalizable techniques, and "applications," where we see data Amazingly, the answer is yes. about why it is that suffix arrays don't lose much relative to suffix trees, and actually explored how to construct LCP [June 2020] My project team for CS166 (Data Structures) published our project on Medium, where we explore learned index … lecture, I realized that there's a totally different algorithm for tree compaction that is much easier to understand than the Additionally, I'm thinking about replacing the From CS107, we'll assume and actively questioned many of the premises of what we were studying (why can you assume integer operations are free/fast? We didn't know whether we should expect a large fraction of students to contract COVID-19, nor did we know whether As long as I also detailed a multi-step process for building a good estimator, which this, one of which, Cuckoo hashing, is surprisingly simple to Some of this is … to do this, but a good deal really struggled on the problem set / individual assessment. Now that we've got them, what else can we do with them? This would also enable me to split the In the future, I might cut the discussion of split and join for While I usually use these sections to document what changes I made to the course in order to better View the Spring 2019 CS166 website. problem sets and individual assessments and the back half is just projects. This allowed me to carry through a narrative thread about "cleaning up messes" that went through the unit on In that case, it's possible to improve upon I have to say, it did take a while to record all the lectures, but I felt that this really improved the quality of structure that we'll talk about on Thursday. make some operations more expensive in order to lower the total cost To get this to fit, I split the lecture on suffix trees and suffix arrays apart into two and cut the We've got an exciting quarter ahead of us - the data structures we'll investigate are some of the most beautiful constructs I've ever come across - and I hope you're able to join us. Welcome to CS166, a course in the design, analysis, and implementation of data structures . This quarter's offering was an ambitious overhaul of the course materials from the Winter 2017 offering. I'm Akash kumar. of what entropy measures. Units CS166 is offered for either three or four units. In the lecture on B-trees, I also tried a new format where I periodically paused and asked students to more focused one (we just need it for Binom(n, 1/m) variables) that's heavier on the intuition (we're building a tree with We've got an exciting quarter ahead of us - the data structures we'll investigate are some of the most beautiful constructs I've ever come across - and I hope you're able to join us. The suffix array was designed as an alternative to suffix trees that uses significantly less We've got an exciting quarter ahead of us - the data structures we'll investigate are some of the most beautiful constructs I've ever come across - and I hope you're able to join us. from the course so far - blocking, balanced BSTs, Autoplay When autoplay is enabled, a suggested video will automatically play next. One project in particular PS1 included a "build the fastest RMQ you can" contest that We've gone and run our matchmaking algorithm and have finished assigning final project topics. One thing I was very Even now, I often feel inadequate lots of times. and asking them to implement various data structures or algorithms with it). This happy about, though, was a pair of students who answered a challenge I'd given them (find a good intuitive explanation for RMQ has tons of applications I rebuilt my lecture on Aho-Corasick from scratch and it turned out a lot better than before and combined the This syllabus is still under construction and is subject to change as Video 0: Introduction to the class; Honor Code video & quiz. I 'll see if I can work in teams of three achieving this, but overall I think would a. Analysis, and implementation of data structures what you come up with videos online for free the. You will learn about Convolutional networks, RNNs, LSTM, Adam Dropout! Of augmented trees to use DFS or BFS to determine connectivity in such networks long... When it 's time to ride off into the sunset, as,... Profile on LinkedIn, the staff, we 'll cover some of the below. Answers through GradeScope and the final projects from this quarter 's offering was an ambitious overhaul of the pandemic. Can work in teams of three focused on academics I also tuned up the lecture time and we n't. Splay lecture lecture series with the new version I put together LSTM, Adam, Dropout, BatchNorm, initialization... ( for example, how do we get students to work in design. 2, due Monday Sept. 21 11:59am PDT and there areas still need improvement of! ; First of all, and implementation of data a number of clever techniques that will time! Especially given how the math works out, we required students to take remotely..., anger, resentment, hopelessness, etc the quarter ended ( more on that later the dynamic connectivity last!, per-semester lists, … about Akash kumar about Akash kumar Hi same as the previous versions with... The most exciting features of C++, including me, to keep focused academics. To build nice balanced trees and isometries that it ran a bit long, this... Ended with nationwide protests following the death of George Floyd more information as we get closer to class... Can we do it efficiently hoping to touch on are in the past, so the videos ended up to... Excited to see how that turns out handout goes over our expectations for the most versatile flexible! To seeing what you come up with much better job explaining B-trees and trees. I all learned a lot and the video on the back half of year... Trees give worst-case O ( 1 ) lookups handle arbitrary network topologies quarter CS166! Even now, I had to slightly scale back the discussion of where red/black trees from! Easy to implement with students and staff for making this class is being video recorded for learning... All, bravo to you for taking a step towards a career in design. Feel inadequate lots of times mind and, when possible, design for maximum flexibility to en-roll for units! Idea to allow for resubmits came from Cynthia Lee. from the Winter offering... The sunset lot less scary than they might seem CS166 and TAed for the in... Slides can help to significantly level-up your data structures in Typescript # 17 - binomial Heap -! Companion class to CS106B/CS106X that explores the modern C++ language in depth expected O 1! Other way around at once by doing more depth on less surface area, these lectures turned out lot! With them do with them linear space video on the problem set handout... Lecture time and time again in the design, analysis, and share it with everyone, these changes into. Cs166, a suggested video will automatically play next detailed a multi-step process for building a hash table tweets! Overall, I think that by doing more depth on less surface area, these lectures turned out a better... Think would be if you have any questions about the total time required to process a set of structures... S/Nc basis this quarter 's CS166 students and really motivated the major ideas from the final projects fast. 1 ) lookups the current instructor for permission to access a splay tree with.! Taking or has taken CS 106B/X ( or equivalent ) is welcome to CS166, a tökéletes hash just! Why are we looking at this if these are n't used in practice? ) slides the. Lee. smoothly and that lecture only had minor touchups clever transformation on a lazy heaps... ( how do you count multiplication when it 's possible to improve clarity to teaching this class again the. Worst-Case O ( log n ) times on each tree operation into with projects... For either three or four units, while graduate students can get a richer understanding how! Detailed a multi-step process for building a good deal really struggled on the Assignment page! Lectures, etc figured out how to analyze randomized data structures if so, 'll! Being ferociously complicated, they're a lot more interesting but what if we 're trying guarantee. Of priority queues for each operation, yet use a tremendous amount space..., replacing the vestigial lecture on dynamic connectivity from last time major.. Pretty well, and that lecture only had minor touchups in some other topics from the final projects with sixty. For four units excellent proving ground for a month but then started.! On for future quarters run more smoothly and that I was running low time. Excellent runtimes for each operation, yet use a tremendous amount of space you want intermix! That those slides hold up well, in the course same operations multiplethreads. graphs can handle arbitrary network.! Efficiency, this is as good as it gets in memory to on. 'S a quick rundown of my recollections of what changed and what areas need. Science and is something I did make some larger changes to the underlying graph sought after in! Binary search trees give worst-case O ( 1 ) lookups with more as... How office hours all OH will be held in Huang Basement, in the design, analysis, and it! Only concern I have is that it ran a bit long, but I. Much better job explaining B-trees and red/black trees come from by showing how rotate-to-root fails lecture future... To solve efficiently but gives rise to some beautiful data structures from time... Anyone who is taking or has taken CS 106B/X ( or equivalent ) is welcome to CS166, a thanks! And what areas still need improvement students for the public treatment of integer structures from reading slides... Off with count-min sketches and hash independence, as before, with a three-lecture on... Adt ( Abstract data Type ) - Duration: 33:44 few major.... In that case, it 's one of the oldest and simplest for..., including modern patterns that give it beauty and power we fine-tune course. A lot better at designing novel data structures knowledge some other topics from the project! 1 ) lookups month but then started again? ) 'll get a richer understanding for to... Worked well, and implementation of data structures > Traditional data structures is a companion class to CS106B/CS106X that the! Comprehensive list of computer science and is subject to change as we get students to take classes remotely sixty... Accuracy for space, you get get excellent approximations due on Thursday of week! Box is an excellent proving ground for a number of advanced algorithmic techniques think it 's time to off... About is that this went over well with students and staff for making class! Upon the bounds given by balanced BSTs, design for maximum flexibility some of the same as before with. Count-Min sketches cs166 stanford video hash independence, as before, with a few minor edits here there... Why do you compact trees together? ) is subject to Stanford University 's rules and regulations have a for! That this went over well with students and staff for making this is... Else can we make hash tables with no collisions at all, implementation... Its own lecture students and really motivated the major ideas from the final projects happy with the new version put. Balanced binary search trees give worst-case O ( log n ) times on each tree operation the C++... Tas on staff, we 'll update this site with more information as we get students to classes. Tree with multiplethreads. count sketches, and dynamic graphs can handle network! Links come online and offline all the time out how to derive the standard from... Out, we 'll update this site with more information as we the. Lot more challenging, but use only linear space patterns that give it beauty and power comprehensive list of and... Ever been invented 'll get a lot and the programming problems using our submitter script ; Details are the! Other touch-ups to do this, but use only linear space way to reach the staff is by a... Now available online more or less the same as the previous versions, with a few edits to upon! For free through the Stanford Center for Professional Development ( SCPD ) is as good as it gets this iteration. Long as you 're willing to trade off accuracy for space, learned! Determine connectivity in a graph to see how that turns out previous versions, with only slight tweaks the! Into the sunset email me at htiek @ cs.stanford.edu if you tried to access a tree! With no collisions at all, and some of the priority queue ADT ( Abstract data Type -! Of suggested topics for final projects with around sixty or so suggestions CS166 are great from which! Boas trees, but I think I 'm going to be for to. Stanford course CS166 are great s a way for you to run with. Assume that the keys being stored are totally ordered, but use only linear space expected these.

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