7 kyu
Check the exam
16,336 of 32,639Dmitry Kudla
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Fundamentals
Arrays
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the problem with the kata is that they do not say that you can take away from zero , and so the easiest
Prolog translation
Approved
Lua translation ready to review !
Thank you !
Racket:
I've noticed that various random-generated tests are 5 less than the expected value.
"Expected 11, but instead got 16. With answer key (c b d a) and answers of (c b d a) the score is 11" In the example above, every answer is correct, so this should be 16. It's interesting that all of the answers it fails me on are always exactly 5 off.
It also appears that this issue was reported by dfhwze and monadius for Racket 3-4 years ago, so I'm not sure if this report will lead to any fixes.
Should be fixed, all elements of
answersare now strings. Please verify.Awesome, that was a quick reply! I refactored my solution to test the fix and it seems to be working, thank you.
Description should be dynamic depending on the language. In python it shows checkExam but should be check_exam. This seems to be an oversight in most translations so should generally be edited.
Ideally, it should be the other way round: examples should be expressed in a way which does not depend on a presented language, do not include language-specific names, and only present domain-specific information. This way, we will avoid multitude of language-specific blocks which lead to merge conflicts.
Approved latest fork which fixes this issue
Great kata, thank you
Why is this so easy. Should be 8 kyu instead
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Fixed,
itblock should not contain anotheritblock, changed to a describe block instead [ref]This comment has been hidden.
OP solved it, closing. (You have a wrong logic check for the 1st conditional statement)
is the array lenth fixed to 4 only? or will it increase and/or decrease?
Had some issues between basic tests and random tests, seems conditions are not correct!
Don't like this test, as always passed in VSCode and basic solutions but don't pass random tests.
The kata is fine; I am the 12,880th person to succesfully solve it in JavaScript.
This means you rather instead should not like the incomplete coverage of tests in your VSCode environment.
Read the description again, your code isn't 100% right, and please stop posting "as always it works in vscode and not here" if you don't use the exact same input in both places, that's what would happen.
Ez one
Description should be language-agnostic
IN addition, it should mention that in C, blank answers are denoted by
' 'as opposed to''This comment has been hidden.
I think some test cases are wrong.
test.assert_equals(check_exam(["b", "c", "b", "a"], ["", "a", "a", "c"]), 0)
it should equal -3 not 0.
Tell me if i'm wrong
I'm stiupid XD omg thank you Can i delate my comments?
Not once you've been answered.
Dude , thanks for writing this comment. I'm more silly because I had in the instructions "If the score < 0, return 0" but still came here to check if something is wrong when I get -3
How come i wrote an absolutely correct code but it didnt work? After spending 2 hours trying to figure out what the problem is, i finally decided to unlock the solutions and saw a solution exactly as mine! so how come mine is not working?! very frustrating. I think we have the right to know if this site messes up sometimes to avoid wasting our time like that!
We can't read your mind or code, but clearly you made a mistake somewhere... The site doesn't mess anything up.
Print the input to console, look what error messages you get, and what assertion output tells you, and you will see that everything works like it should.
Also, this may help: https://docs.codewars.com/training/troubleshooting/.
Your code fails a sample test, it's easy to figure out why seeing it.
His: Empty string correct answer wrong answer
And that is why mine wasn't working! wow. Can anyone explain why that makes a difference?
How do you want anyone to answer you, we have no crystal ball to guess what you're actually talking about, we have no idea what your code looks like, we don't even no the language you're using...
All day users complain about wrong tests, wrong site, wrong kata, etc. And in the immense majority of cases they are wrong, their code is bad or they don't respect the instructions. About 15000 people solved this kata and nobody reported a true issue. What's more likely bad, your code or the site?
A minor change in a code can produce major changes in outputs. Now if you want to do something useful, provide a clear example of the code you used and you suppose is good (with a spoiler flag and properly formated), a test case and its log, and if really ever something was broken, someone may be able to check it out and fix it, or more probably, someone will explain why your code is failing.
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akar-0 sometimes, you can see their code with
View Solutionunder their posts. That's what I did here.You have to return o if the score is <0
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Just tried your code and it worked for me.
Do you mean worked in kata in browser or in some external editor/IDE?
Here in the trainer.
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My code is passing some tests but a couple of them are kicking back. Logs and test below, I can't make sense of it! I think the test value is incorrect in this case?
Log Question 1: Wrong answer, -1 point Score is now -1
Question 2: blank answer, 0 points Score is now -1
Question 3: blank answer, 0 points Score is now -1
Question 4: Wrong answer, -1 point Score is now -2
total points is -2
Test Failed Should return 0 with ["b", "d", "a", "c"] and ["a", "", "", "b"] Expected: 0 But was: -2
Thanks! I kicked myself a few times and added a ternery at the bottom to handle this. But now it fails because it received 0 but expected -4
edit: I had written an incorrect test XD
Hello! I'm learning myself how to program in C. Can anyone explain me what the code below means? I've passed the test but I found out that many people use this statement in solutions and I don't know what it means. Thanks in advance! return score > 0 ? score : 0;
(condition) ? (if true, do this) : (otherwise, do this)
This is the ternary operator.
ternary
Thank you guys! Appreciate it!
Racket: mixed types; sample tests use String, while test cases mix String with Char. There is another (more specific) issue logged about those mixed types. This issue is about the fact you should not mix types. And if you really must, make sure to add sample tests for each supported type.
Should be fixed, all elements of
answersare now strings. Please verify.C# translation ready! Please review and approve.
approved
This kata !== 8kyu
Java translation added. Please review and approve it.
this is definitely not 8 kyu
It was harder than a usual 8 kyu for me.
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array2.Lengthis undefined and JS would never complain you about that, you should usearray2.lengthAn advice: Don't start your programmming career with JS.
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Rust translation kumited :-)
Racket: random tests may generate lists with chars and strings. This leads to the following error messages:
In this example, the number of correct answers is 5 and the number of incorrect answers is 3. So the final score should be 17. But the expected result is 12 because types of list entries may be different.
Should be fixed, all elements of
answersare now strings. Please verify.This should be revisited for difficulty. At least a 7. Definitely not an 8.
error in C Edition tests: the second test which excepted 7 should return 6
Nope, everything is correct.
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Lists are zero-indexed. And maybe it doesn't matter here for Python tests, but generally don't assume the list length is fixed.
Hi, I've passed the four tests but I am failing some random ones. How can I see the random tests that I am failing?
https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution
I think you'd need to subscribe for a premium account
No you don't. It depends on how kata is authored, and one possibility is to print inputs from your solution.
I'm ashamed to say that I stayed more than 1 hr on this(I was very tired) :P .I think it should be higher than 8 kyu though.
Don't be ashamed. Keep learning.
Thank's for the trust haha :D
I agree, think a kyu 7 for the concurrent loop logic.
I would put this more on a 7 than an 8.
why would the fourth test be 0 in result? the student got the first null, and the next 3 bad.... it should be -1 point! :/
It's in the instructions.
yes, my mistake
The description has errors in the C version. You describe the second array as "answers" instead of "student". Also you refer to the "empty string" but instead the program expects a space character
(' ').fixed, thanks
Thanks
This sucker is tricky. Took me two hours, and I don't even know why I kept plugging away at it...but in the end it is satisfying.
The victory hard won is twice as sweet.
PHP translation ready! Please check and approve it.
Forked and approved
C Translation available. Please check and approve, thanks.
approved
thanks!
TypeScript translation ready! Please, approve it.
This is more like a 7 kyu question imo...
Racket translation
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Just now realized I forgot to add the freaking return statement...
Last of Sample Tests seems to be incorrect: ["b", "c", "b", "a"], ["", "a", "a", "c"]), 0 array2[0]=== "" - gives 0 array2[1]!== array1[1] - gives -1 array2[2]!== array1[2] - gives -1 array2[3]!== array1[3] - gives -1 the sum shoud be -3 (0-1-1-1). Colud you please state why it is 0 not -3?
Because of that.
Thank you
Like all other programming work, this question is way much easier if you take more time to read the description before getting to your keyboard. The best programmers are not typists, they are thinkers.
Thanks man it really helps :)
There are some incorrect tests in the kata, for example: checkExam(["b", "a", "c", "b"], ["", "b", "c", "b"]) # test expect 7, but correct answer 8 (0-1(→0)+4+4) checkExam(["c", "d", "a", "a"], ["", "", "a", "c"]) # test expect 2, but correct answer 3 (0+0+4-1)
Not a kata issue, wrong answer subtracts 1, for the first one 7 is ok as expected answer,
0 - 1 + 4 + 4 == 7, the second one does seem wrong, but I checked the control function for Ruby and it would expect 3 for that test too, are you sure of that test?Thanks for clarification, Chrono79! Now test #2 is gone (I dunno how and where) and I change my solution logic for test #1. It works :-)
too rough for 8kyu imo
Usually I'm the first to complain when descriptions are very poor... but after checking the discourse for the issue and finding the "return 0 if the score is less than 0" in the discourse, I went back to do the puzzle and even looked at the description... and...
I understand how I missed it... but I cannot give any better way for it to be visible. Any of the usual things I'd suggest for that are kind of already being done in the description.
The puzzle is fine and awesome... the weird quirk in reading the instructions is now what my brain is trying to wrap around xD I mean... yeah, people are missing it--yeah, the missing it is understandable--but it is also doing everything it can to not be missed xD How to fix this?
How did I miss this? :) :) I was comming to the discussion section to rant at how badly I thought the question had been set, then I saw your comment. Thank you TheLamia
I would suggest you thank @Chrono79 as their patience in reminding people of this in the discourse... is... well, noteworthy.
I need help... I just started this and this is my second kata question...
8 kyu, pfft...
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Agreed. The answers array has one not-answered element (worth 0) and 3 incorrectly-answered elements (each worth -1). I don't know why the test expects 0.
Read the instructions again.
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Read the description again. Why are you breaking out of the loop? It says
+0 for each blank answer(empty string).so you shouldn't break out, just add 0. Also, this is not an issue, mark your comment as "question" next time you don't know the answer to the problem.I did mark it as a question initially. No one responded until I changed it to an issue. Thanks for the suggestion.
Well thats BS because you can't change the comment type after it has been posted.
Maybe he deleted it and created a new one? It's possible I guess if it had no answers. But then he had no patience to get the answer ;)
maybe :P
It's not BS. I did change the comment type. Didn't have to delete it. Stop talking sh** about me. And you have to be very patient to get an answer to a question. Issue gets almost immediate response. But, I hear you, I'll use question next time and just wait around. Sigh.
Yeah, my bad. For some reason I thought that you couldn't change the comment type. Anyway, the only reason you had an immediate response was because you marked your comment as an issue instead of a question, which it should have been. You make the kata author lose points if you mark it as an issue. If you had just re-read the description, you would have known what you were doing.
Instead of 'break', you should use 'continue'.
Test example contains a strange one: Test.assert_equals(check_exam(["a", "a", "c", "b"], ["a", "a", "b", ""]), 7) Why answer is 7 if arr1[3] != arr2[3]? Description suggests to use only 2 scores: 4 if answers are the same and -1 in opposite case.
Read that again, there are 3 cases there. Not an issue.
I personally feel that an empty string is an incorrect answer. Correct me if I'm wrong.
Then what would be a blank answer?
Python translation kumited
Please review and approve.
Ruby translation kumited
Please review and approve.