Download Codeforces Test Cases
Keiko Bludworth
Hello everyone! I want to ask one question, is it possible to view full test case? For example it says wrong answer on test case 10, but in the end of test case is '...', is it possible to view full test case? Thank you!
When you submit a code, codeforces shows the testcases of the problem, but when the input is too long it can't be copy because the input is INCOMPLETE. Someone knows HOW TO SEE OR COPY A COMPLETE INPUT?
Exactly. Nobody at Codeforces got time to implement direct download links for every large test case (are they bigger than the average blogpost with comments?). Instead they seem to favor a ridiculous excuse and a load caused by such extraction submissions. If they think that getting full test case is useless, why do they bother showing it at all?
In sublime Text there is a package named fastolymp coding in which you can do stress testing with correct solution and you will be able to find a testcase where your code fails Youtube link hope this helps ;}
I'd honestly say that it's better if you can't view test cases. In most if not all contests, tests cases are hidden, so it makes sense for them to be hidden during practice. Plus, it improves your debugging skills :)
I'd say if your code fails at test case 24 or something, most of the time your code have a segmentation error or a very silly mistake. This is a vague shot but I've been right about this whenever I encounter this problem myself. So maybe look for those silly mistakes because your logic could pass through those 23 test cases before
When my solution fails on a larger testcase, I can only see the first few lines of the testcase and have to submit again and again to find out what's going wrong with my code. I think it would be much easier to debug if I can download the testdata. In this way I can test my solution locally.
well downloading the big test cases is like making a big test case, because if you download it, how do you want to debug it!? so if you want to find a test case and debug your solution, you can write another program which you are completely sure that is working (even if its complexity is too bad) then make a big test case(you can use random) and then check your solution with the other one. then you can find a smaller test which your program is giving WA. it works most of the time.
Normally this is what I do, but sometimes it is hard to generate strong tests. If I can download the testcase I can test my solution easily instead of submitting over and over again, waiting for the verdict
I am seeking for your advice: how to improve my skills of figuring out test cases where my program fails? I have been facing quite a few WA on 100+, 300+ test cases and each of the times I wasn't able to get what was that edge case by myself. Hence, I am asking you guys for an advice :)
Great. Btw, if you can't figure out what's wrong, you can try to simulate the tests. Generate them with random values, run your program on them, and write a checker, and you have a big chance to find what's wrong.
In simple programming language , just create two method In one method put accepted code or brute force and In second method put your code and generate random test cases and run your program and then stop your code when two methods give different ans
Hello peeps! So I all started when solving a C problem, I got the logic but for some TCs it was failing and I wasn't able to see those TCs. So I searched a bit on the web "How to get the testcases of any problem CF?" but found out there are no simple ways to get them. From there I got the idea to make something that turned down to this CF-TESTCASES using some web scrapping technique and CF's own API.
I tried to fetch the test cases for problem 1879-A. It successfully retrieved 7 test cases. However, when I try to view the numbers of the 1st test case, after a certain point, it displays three dots (...)
I haven't installed the tool, but I may know what the problem is. From skimming your code, it looks like your tool goes to the webpage of an AC submission and downloads the test cases from the corresponding text boxes. However, this does not work for test cases over a certain size. Consider test case 4 at this link, for example: after printing a certain number of characters, the input is truncated.
It seems that this tool has been having some problems fetching very large test cases due to Codeforces truncating tests. A really slow solution (that may be against Codeforces rules) would be to implement a hacky way of getting test cases. Since the program output is included in the submissions page, you could, in theory, submit code that prints out the first 50 lines of input, then the next 50, and so on. This would require significantly more work to implement, but it could likely be done (albeit, very slowly).
(I assume) The tool fetches the submission HTML page and then extracts the embedded test case. As the response page truncates the test input but only show first N characters of each test, I don't see how magically the tool works around it and likely it does not. To get test input with O(1000) numbers, people can throw exception in the code to show a chunk of such numbers and do it in O(20) submissions, which is rather tedious and not feasible for larger input.
In educational codeforces round 96, I am not able to debug my code for a particular question after trying a lot. The test case(112th) which is giving wrong answer is not shown due to the long list of test cases. Link to the problem My code-
It looks like the string in the 112th test is short (maybe 8 chars). You may try to write a simple bruteforce solution for this problem and test your solution against it on all the possible small inputs.
Another option, take somebody else's solution and check it against yours on all short strings. If that doesn't help, test it against a correct solution on random data, this way you should definitely find a failing test.
on your personal page there is "submitions" link and when you click on submitions number, for example 1301627 and scroll down you will see last test case. When inputs/outputs are huge there is only first 250 characters.
Hello everyone, have you ever faced a situation where you get a non-AC verdict on a certain testcase, but you are unable to debug your solution because you can't analyze (or view) that large testcase? or you are pretty close to the the solution, but don't want to look at the editorial yet, and wished you had more (small) testcases to brainstorm on paper? or a situation in which you feel you could've debugged your solution better if you could just run them on the hack-testcases (which are usually placed at the end of the test-set)?
I've created cfdebug.org cfstress.com to help you in the above situations. It's a tool through which you can see all the small/corner testcases for any problem on Codeforces. By defult, it's sorted by input size (so that it's easier to dry run on paper), but if you get WA on, say TC19, you can filter it to remove all smaller testcases with index less than 19. This way, you'll have access to the next smallest testcase for you to debug.(Temporarily removed). You can also copy the input/output to test the program seamlessly on your local environment.
The workflow is same as before, enter the contest_id (which you can find by looking at the URL of a problem) and problem_index, and click on Stress Test. On the next screen, click on View Hacks to view all the smaller testcases in the test set.
Hello everyone! I am a beginner in CP and I recently started practicing in Codeforces and Atcoder. So I had this question for a while; Is it bad practice to see failed test cases instead of figuring that out by myself since during actual contests we cannot see that. So I want advice from you guys regarding this because I don't want to get accustomed to bad habits.
Thank you!
For my personal opinion , if you think you have tried your level best of the problem but missing some simple corner cases while practicing then you should see the test cases(except sometimes you may face infinite query in test case).The reason is staring at the problem and your approach won't help you much, and it may lead to depression and waste of time which is very bad for cp. And of course it's a bad practice to see frequent test cases but you should know when to give up and go on.
Being able to figure out what is wrong with your code without looking at test cases is a skill that you will develop over time. When I started out, I would look at test cases whenever I got really stuck trying to find the bug in my code. Nowadays, I'm almost always able to fix my code without looking at the tests. I'd recommend the same approach for beginners: it's okay to look at tests right now if you get really stuck trying to find a bug; over time you should get better and better at finding bugs on your own and accordingly be more strict with yourself about not looking at tests.
Also remember that you can always generate your own tests to run your code on -- this doesn't always work, but sometimes it will (and it's possible to develop a sense for when it might help you find a bug) and you can do this during contests too.
I think that initially you should try to find the error without looking at the testcases. But if you are really stuck (that means usually it is a hard problem to you), I would say it is ok to look at the testcases.
I am not sure but I usually look up the test case if its possible to see because there may be chances that I am solving the problem in wrong direction considering that to be correct. You can then think of another approach and hence can save time.
I suggest you not to see the test case and instead of that review your code and see if there is any problem with that.it helps you to code better and with fewer bugs in the future.i think seeing the test case makes your mind lazy and it becomes a "trial and error" procedure.you have WA you see the test case you fix the bug.you have another WA you see the next test case and you fix another bug.while this be done faster if you review your code completely.good luck.
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