Reddit cs50 tideman Anyone may take CS50, even if not a student at Harvard. especially on their own. All other examples are fairly simple "linear" uses of recursion, like Fibonacci or the conversion of text to integer (the atoi example). According to Tideman sort_pairs function specification - "If multiple pairs have the same strength of victory, you may assume that the order does not matter. It took me about 3-4 days to solve Tideman when most PSETS took me at most a full day. Sep 4, 2024 · tideman For anyone really struggling with the recursive function "check cycle" in lock_pairs in cs50 tideman, I made a scenario to hopefully help you code your "check cycle" that could be used in your lock_pairs. Recursion is the usual method and, I suspect, the intent ded solution. A lot of the problem for me was that I couldn't translate a recursive function from the lecture to my own code, I tried to use the function to call itself but that ended up being wrong as it edited the main body which caused check50 to fail to compile. The key point of the tideman exercise is to push you outside the envelope of what you have been taught. Hi all! I hope you're enjoying your CS50 journey as much as I am so far. Its hard by design, and the more comfortable psets are geared towards people who have some coding experience and yes they make everyone feel dumb, but I did an experiment at the start of week 3, I went back to credit and tried to solve it again. Sigh. Lock_pairs (check_cycle function to be more exact) was the function I really struggled with. I'm so happy! My advice (for future me as well): draw tables, graphs, charts, and diagrams for EVERY SINGLE STEP to really understand and see what exactly is going on at every line. EDIT: finally I submitted Tideman after being stuck for 32 days😱😱😱 it took me a while to understand how we are manipulating one array, Using another array and locked_pair() was toughest. i felt like a total noob with the whole process of feeling lost, going through endless debugging, rewriting, and trying out new ideas, making painstakingingly slow progress and then i realized that this might just be what being a Tideman is a tough assignment especially with the math aspect imo. I think you should give tideman a try tho or at least watch the walktrough, just so you know a little about the monster. com Midway through, I sat upright "because that's how recursion works!" And sat around waiting for the movie to end so I could run home and try Tideman again. The Tideman algorithm is designed to handle ties, and it uses a ranked pairs method to resolve them and determine a unique winner. . In the end I had to "cheat" but i never submitted tideman anyways, although i have a working solution. I've been working on one sub-function involving recursion for the past half week. Come back to it each day, get in the state of mind required to program and once you are - pick away at the problem set little by little. A focused topic, but broadly applicable skills. It’s the only CS50 problem that doesn’t do a good job of introducing the key concepts before you do the problem. cs50 Tideman My code is running fine with no issues (at least with the tests I'm running). cs50. and candidate 0 could be the last element to have edges. We'll never know until you try :D However, if you really want to skip tideman for now, I still think that is a good choice. Now I am trying to wrap my head around recursion and redoing tideman is how i'm practicing that. Or check it out in the app stores CS50 tideman - lock_pairs skips final pair if it creates cycle 38 votes, 28 comments. However, after surfing this community I came to the conclusion to skip tideman in order for me to save time. I'm pretty sure the next times I'll run check50, I'll get war flashbacks whenever I see red. Also - don't be afraid to visualize your thoughts using a whiteboard app (like Miro or Microsoft Whiteboard). Try it and then visualize what a cycle is: Follow the lines (the path) from the pair-to-test through the locked "lines" back to the pair in question. The walkthrough says that preferences[i][j] is the number of voters who prefer candidate i over j. In the problem specification page, the entire section from "Background" to "Understanding" tells how/why the Tideman algorithm works. harvard. edu Worked through Tideman and for all the functions I managed to figure them out myself relatively quickly, except (of course) lock_pairs. Members Online Harvard professor says he gets thank-you notes from prisoners, some of which are secretly using smartphones to take his free computer-science class Demanding, but definitely doable. The msg from check50 can seem a bit misleading, often people fails this test because it has a fork included in the path from pair to pair. If you encounter a fork and first branch does not lead to cycle, you need to go back to the point of the fork and check the other branch. Though I did all the "more" pset rather than the "less". r Credit took me forever, then some time later tideman turned me grey. :'( Still, A+ for effort! Hey Gang, I'm having trouble with my sort pairs function. overall it was a great experience and after completing this problem, I am feeling a Get the Reddit app Scan this QR code to download the app now CS50 PSET3, Tideman - lock_pairs failing to skip final pair if it creates a cycle upvote r/cs50. and the solution is difficult to understand, so it took me around 6 hours to wrap my head around this. On the other hand at Tideman, the graph was being generated a bit after bit. Any help would be greatly appreciated. I finished the Tideman assignment in PSET3 yesterday 🎉🙌! The logic of that election strategy eludes me, however. I had to cheat there as I was not able to come up with any logic. Turned my understanding of what a cycle is was wrong. " and if we look in the Preferences Graph there are 4 pairs which have the same strength 5 - 3 so we can basically sort them as we want (randomly/as the algorithm will do)? Demanding, but definitely doable. CS50 is Harvard University's introduction to the intellectual enterprises of computer science and the art of programming. A focused topic, but… Tideman is hard, yet solvable. Nothing in cs50 has been as ridiculous but I'm not sure if anything else was as ridiculously rewarding as Tideman. Because Tideman dumps graph theory on you without any decent explanation of what it is or how it applies to programming. I know the point of the problem is to gain a deeper knowledge of loops, arrays, and sorting, but I am still bothered by an election that will declare the weakest victor the winner in the event of a “cycle”. Tideman can be a bit mind bending, in the end the final code seems so simple, the hard part is to grasp the logic and transform into that simple code :) EDIT: There is a reason why Tideman is a "more" pset! You said it well. If you completed runoff, then you have the mind set to complete Tideman. Getting the Best from r/cs50. Most of Tideman has been pretty ok. My Tideman code runs and provides correct answers but does not pass all of the CS50 checks. They did an amazing job separating the problem into functions. And for the record, most people in the actual Harvard class don't do it. Demanding, but definitely doable. Jesus christ I think I just got traumatized. Well done I finished runoff and plurality I have been procratstinating tideman for a week now Might hit you up for questions if you dont mind as I go through this as I struggled a bit with troubleshooting in runoff as debug50 didnt work for me and I was trying to understand where the issue was in which function since my code passed all their automated testing yet my manual testing was failing. You’ll solve the logic eventually. I have completed sorted_pairs() but now I am questioning my interpretation of the requirements given that in the "background" section they talk about "margin of victory". To complete tideman, you need to make your own function and algotirhim right, because as far as I can tell, there is no algorithim that can be made using the coursework or the shorts given to you as a student. I actually skipped tideman. We would like to show you a description here but the site won’t allow us. Get the Reddit app Scan this QR code to download the app now. Go for it guys it took so long for me but improved me so much! It took 9 papers of writing pseudocodes, mindmappings and abstract things (to remember variables and edges to see the pattern while I was forcing my brain to act like a compiler) for me. It's a strange concept that is difficult until it clicks, then it becomes a super tool. I am attempting tideman again with recursion this time, as I didn't understand recursion fully on my first attempt 3 months ago and I wanted the challenge of completing it without. From what I can tell, your's might be, too. I've racked my head a few times, but after writing stuff down and breaking down the problems as much as possible, I've been able to solve up to sort_pairs. io. I know this algorithm works for sorting an array as I've tested it out in a separate code block, but when I implement it in tideman and run debug50 it skips over after checking the conditional and I have no idea why. If that is possible, there is a cycle and you cannot lock that pair. However, when all candidates have the same preference, there is no way to establish a clear ordering among them. I'm still pondering whether or not I should take it after the final pset. for me, who has no experience beyond the first few weeks of cs50x, tideman felt like bootcamp, like i'm fundamentally different after vs before. Working through and solving problems like Tideman helps develop your understanding of concepts, which likely is why you're taking CS50 in the first place. when I did tideman I HAD to look at the answers to find out how they did this. Going most to least difficult: Tideman Filter (more comfortable) everything else Tideman (W3) is like an exponential jump in difficulty, then Filter (W4) is still more hard than what you're used to but feels easier to tideman, then after that I won't say that the problem sets get easier, but they feel easier because you're kind of used to more difficult problems and they don't bother you as Demanding, but definitely doable. You can do it and when you complete it, you'll feel amazing Currently cs50 student on Tideman. Who knows, maybe you solve tideman without any problems whatsoever. My loop depends on candidate 0, so it aborts the operation if the candidate 0 has no neighbors, because candidate 0 is isn't necessarily the first winner! Tideman is the sort of challenge that makes you really want to throw in the towel, but you just keep facing it again. I tried looking at other people's codes, tried rubber ducking it. The most helpful thing to me is using pseudo-code, if something doesn't make sense use the rubber duck strategy and explaining the problem to someone else in human/duck logic. Tideman (like all the more comfortable problems) is really there for people who have had some experience programing before they started CS50. A small hint I’ll give is, in the CS50 manual there is a function that can help automate your algorithm. AP CS Principles; edX; Harvard College; Harvard See full list on cs50. Remember this was designed to be the first sort of real world experience type of PSET, so in terms of difficulty if you can solve this you can complete Hi! I am a little bit confused about record preferences function in (pset3) Tideman. Took me a week to go through tideman because my singular brain cell forgot that there are video walkthroughs, which I just remembered when I finally submitted it. I'm not noticing any issues except for when ties between pair strength occurs, but the instructions say to ignore it. statuspage. Status Page. EDIT: I hate to be "that" guy, but it turns out that the check50 function for tideman is not technically checking for cycles correctly. The break-through for me on Tideman came after I drew on paper the candidates with lines between them as the pairs (edges). It comes down to knowing what you're doing. Please Read before Posting. So, you've said: Therefore, I must stop locking pairs at the point in which the loser for that pair is the final candidate that hasn't yet lost (if indeed this ever happens). You can skip all of this! Because they (CS50) have written that part of the code for you. Not on my PC atm, but with BASH shell on local build, and likely on the CS50 codespace, a textfile with input then line break looking like this should work for in this case 3 candidates and 4 voters ('a b c') as input file: IMO: To properly solve Tideman requires using recursion in a way that is different than any other example given in the class previously. Social, but educational. Not on my PC atm, but with BASH shell on local build, and likely on the CS50 codespace, a textfile with input then line break looking like this should work for in this case 3 candidates and 4 voters ('a b c') as input file: 38 votes, 28 comments. CS50 is the quintessential Harvard (and Yale!) course. use the following search parameters to narrow your results: subreddit:subreddit find submissions in "subreddit" author:username find submissions by "username" site:example. 106K subscribers in the cs50 community. Please bear with me as I'm fairly new to coding but insist on completing the harder problems before going further in the lectures, just to make sure I understand everything before I lean more info/structures/concepts. So, awesome job outsmarting the CS50 staff on their unit tests (hehehe), but the solution without recursion breaks down when we increase the candidate size and/or voter depth. It's in main(), and it works for sure, as long as the code you are about to write works. I'm really struggling with lock_pairs, though. difficulty. Tideman is just the next step up from Runoff. And then they give an example (in minute 7:56 of that video) where a table is filled based on 4 votes. I've completed CS50 in 2021 and, for me, tideman was actually the most hard and “painfull” pset. Hey, I had a lot of problem with this part of Tideman as well. Watch the shorts, go to the ed forum and rewatch the class. Nov 29, 2024 · This is CS50's subreddit. dkn xagp muhl hwbn njqy qiudvh mfte dzgf zxul hthuz