6 kyu
Multiples of 3 or 5
137,182 of 447,062jhoffner
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Mathematics
Algorithms
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Everybody should implement the loop, because it is the most intuitive and you get it done in 3 minutes. For an interview it is the best way to start.
However, it is a very inefficient code. It can be done in a single line computation in o(1).
I thik that this task is 7 kyu max
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Please don't post solutions in Discourse.
Hey, i have seen other people post solutions here and no one else complained. Im just trying to help people by providing my code which gets the job done with no faffing about. I dont mean this in a mean way, i js wanna help.
How is spoiling a solution, when the purpose of this platform is to solve problems yourself, helping others?
I thought this was a space to share solutions to help people. I just recently joined and dont know the community that well. I just wanted to help.
for newbies: https://docs.codewars.com/
Why are you calling me a newbie? Im trying to be respectful and i apologise for my actions due to my lack of knowledge. I appreciate the help but i find your comment unnecessarily mean and rude. :(
newbie means beginner you said yourself you are new here
Yes, it just means "newcomer" to the platform.
"newbie" is not a derogatory term, it just means someone who is new in some place, platform, or a community. You said yourself that you are new here, and there are some resources dedicated to help new users, like docs linked by dfhwze (including this paragraph and its third bullet point), or Codewars Discord.
I am not sure I agree with "other people post solutions here and no one else complained", and I believe that out of 10 posts with spoilers, 10 is hidden, and ~7 is accompanied by a reply asking to not share solutions. If you see a post with a spoiler which is not hidden, feel free to use the "Spoiler" button and mark it as such. While general hints like "dont get mislead by overcomplicated problem statement" and similar are generally OK, we try to keep discourses clean from blatant spoilers like a ready-to-submit code, because this is usually counter-productive.
I would also be extra cautious with posts like "hey, look at my great solution!" because it might not always be the case. Actually, the presented code, as short as it is, already contains a couple of problems, including stylistic ones, and performance issues. This is totally okay tho, because we are all here to learn. But there is a reason why sometimes longer and more complicated solutions are considered better, and there are good lessons waiting to be learned from them.
woah, guys i didnt want this to escalate. I apologise for js trying to show my code because i was proud of myself and wanted to share my personal acomplishment, even tho to others it may not seem impressive but to me i thought it was. However i realise now that this space is not the place.
Honestly, I don't see any escalation here. I see a sharing of information void of disrespecful intention. There are a lot of people here willing to help.
Welcome to Codewars!
Hey rowcased, thanks a lot. As someone who recently joined the community, I felt like your the only one who has had some sympathy for me and understood my mistake rather then belittling me for it.
You just couldn't resist firing off one last shot, could you?
Three people went out of their way to clarify that you weren't being belittled-just welcomed as a newcomer. A moderator even took the time to demonstrate how things work here, and did so with genuine respect. Rowcased's closing remarks should have wrapped things up on a positive note.
But instead, you had to return with one final, nasty jab at other users-including the very mod who was trying to help you-by insinuating that only the last person showed you any kindness.
Enough with the victim act. Pull yourself together and dive into the many wonderful code challenges waiting for you. There's a world of learning and growth ahead! Remember, those who you feel are "belittling" you are actually here to help whenever you need assistance. If you want even more support, you can always turn to our Discord channel and ask for assistance.
Happy coding, newbie.
Hi dfhwze, Im not firing any shots at anyone. I do appreciate everyones help. I originally posted my solution here unknowingly as I thought this space was to share ideas and I was pleased with my code as i found it simple. I didn't know it was a big deal. So i again apologise. I had only stated what i had felt at the time, it was not a nasty jab at others. Lets move on.
Happy coding.
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Please use the spoiler tag when posting your code - all unspoilered comments are visible from the home page, so this will show up even if someone hadn't solved the kata.
thank you, i will do that next time, now it is already marked or how can i do that?
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I could only think about for loop. Not the best solution but works, yay ;)
My javscriopt console.log(result); equals the answer but it marks it wrong. Why?
Your solution seems to pass now?
Yes, I didn't read the instructions correctly. my mistake.
how do i do this
Think of how you would do this (without a computer) and then code it
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Your code error lies here, not a kata issue :-)
this is too easy for a six
Yet so many people solve it by iterating. I think the main problem there is the fact that the test cases aren't large enough to cause timeouts.
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"my solution does not work" is not a kata issue.
See if this paragraph helps: https://docs.codewars.com/training/training-example#writing-a-solution
also, @theSultain
please do not post code or discuss method solutions without using the spoiler flag
I have since added the flag to your comment
Nice problem. Easy to implement solution.
Something's wrong. My code is giving me the correct values, but the system keeps marking them as "incorrect". What's going on?
the error feedback message says
expected undefined to equal 23Which means your code should be returning 23, but it returns
undefinedbecause it doesn't return anything. To pass kata you need to return a value, not print it.So are you working with numbers in a list or am I trippin
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big dady
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There is a couple of problems with your solution, but two biggest ones are:
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Not a kata suggestion. See https://docs.codewars.com/training/troubleshooting#post-discourse.
C: The tests for
Quadruple_Digit_Testsare the same as theTriple_Digit_Tests, they have 3 digits instead of 4.fixed in the editor, thanks
i have a problem, the page said me my code is very slow(12000ms) but when i test it on my pc its works fine like Tiempo de ejecuci├│n(execution time): 186 microsegundos(microseconds). I think its internet
s speed. Somebody Can affirm this ?You have a typo in your code and it has an infinite loop. Not a kata issue.
no its not, the real problem was the a lot loops there is in my code. But my code pass all tests without any problem except the last. Because, one the test is a random test like a number of 5 figures when my code try to solve it, is when the time begins. But thanks i resolve it, i eliminate some innecesary lines and works now
Yes it was the problem, you had the same var name in both loops conditions RomperCondicion5 (or 3, can't remember and you've changed your code now), but you had different var names inside, RomperCondicion3 and RomperCondicion5. So, instead of exiting the loop, it was running until it timed out because the changes you made to one var didn't affect the other. Well, that's a good reason to keep your code dry (dry = don't repeat yourself). Read this please: https://docs.codewars.com/training/troubleshooting
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how i can save this kata¿
You can add it into collection --> read more info here
Thanks
bruh, I can't do this :/
233168
Why 16 should return 60? or what am I missing because if I just calculate multiples of 3 before 16: 3 6 9 12 15
it gives me 45
and multiples of 5 before 16
5 10 15
gives 30
and 45+30 is 75
You counted 15 twice.
thx!
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Don't write a main method here, see the initial code and fill it in:
Read this: https://docs.codewars.com/training/training-example#writing-a-solution
Not a kata issue.
Shouldn't the description say something about the size of values being tested, so that one knows that something quicker than the straightforward approach is needed?
NO random tests in Groovy
Also in Java, and probably other languages...
my code is working and giving correct output on my vs code but when i am entering the same code here its gives error and wrong output??????????????????????????????????????????????????????????
Yes, this happens when code is wrong.
I would gladly take a look at your code. Also this code doesnt work if you register the increments in a console.log,aparently it breaks the console due to lack of space.
Did you make sure to keep the name of the function the same? When the test case is run it will call the the function "solution".
hi so... i just joined but i dont know what to do can anyone help?
You can start by reading docs, for example this introductory article: https://docs.codewars.com/training/training-example or you can visit CW Discord server and its
#beginnerschannel.I tested it in pycharm everything is written right, but this tester is not working, reutrning some import error
...but your solution seems to pass all tests?
If you still have problems, we cannot tell what is wrong with your solution without seeing your code.
Ive noticed you are a mod,you should put a warning the code doesnt work on the attempts if you are registering your incrementations in the log due to lack of space, thanks in advance!
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Not a kata suggestion. See https://docs.codewars.com/training/troubleshooting#post-discourse.
This is novice level?
Do you think it is harder or easier than novice level?
let me know if someone wants help, i would be happy to offer my help :)
Seriously, needing help with giving help is not a kata issue.
you'r right, i am new on this software but for me the best way to learn effective is to explain it to someone. so That was the reason...
я бы хотел, что бы мне объяснили озы, я смотрю в код и вижу обычные цыфры, понимания вообще нету даже на 1 %
For small test case, it says input 3 = 0... 3 is still multiple of 3.
Please pay attention to the description. Not a kata issue.
Still don't think the description is clear.
After "If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.", one line with "10 is not added since it is passed in number." will be more clear.
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See this article how to use code formatting.
See if this article explains what you are doing wrong (it does, but maybe not in a direct enough way).
If you cannot get the challenge to work, the best way to get help would be to visit the
#help-solvechannel of Codewars Discord server.It is very bad reward structure when the shortest code shown at the top of the list is O(n) when there is a O(1) solution that is not much more code.
You can upvote other solutions that you believe are better or more performant to push it to the top!
Resolved since this is not an issue about the kata description / test structure.
Marking this task as 7 kyu makes more sense to me, I visited a lot of 7 kyu tasks lately and the difficulty is very similar, whereas the vast majority of the 6 kyu tasks are harder than this.
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Despite being categorized as a 6kyu-level challenge, the task at hand appears to be relatively straightforward, requiring a level of proficiency that aligns with the lower end of the difficulty spectrum for coding exercises. Stay Hard
I'd say it would be an actual 6 kyu if it required you to do it in O(1)
Help me!!!!!!!!!!
Error: expected undefined to equal 23 :(
I have a console log,but its not working :(
Edit 2 min later: the "return" was missing :)
What does 'below the number passed in' mean at the end of this instruction?
"Finish the solution so that it returns the sum of all the multiples of 3 or 5 below the number passed in."
TIA! :D
That if your function receives a 10 as input, then your function should return the sum of multiples of 3 or 5 until 9 inclusive.
Thank you so much for the clarification!
so easy for 6kyu
yup agree
Why is fizzbazz considered 6kyu?
It was an old kata and re-ranking it is not possible for now due to old DB setup, but it is already planned and will be done by community maintainers in the future!
I dont like most part of Codewars's exercises, 'cause it doesn't have clear instructions. I suggest that the exercises has instructions that really give the main idea of the tasks ang give good examples too.
Agree with u, even asked gpt for completly understand what i need to do
RISCV Translation
I used replit to test code before implementing for an attempt/test here. I received multiple fails on the attempt, when I looked it would say something like expected +0 and 10 to be 23, code was exactly the same in both places, yet on Replit my solutions were the exact same value as was expected. So I have no idea whatt i'm doing wrong here.
I'd add to the description a warning that big numbers can be used in the tests. I tried solving it with recursions but that throws RangeError: Maximum call stack size exceeded while for most numbers it would work, if you're not using over 10000 in size
Seems pretty straightforward that big numbers are being used.
Is it normal at 6kyu to have performance issues?
I am a beginner and was really happy, that I managed a 6kyu for the first time, but there was one test not passing because of performance issues. I only could finish with the help of GPT.
Yes, for yellow kata it is nothing unusual to expect a solution of some specific complexity class. Many yellow kata still accept solutions of poor complexity, but there are many which have stricter requirements.
Having said that, this particular kata has no special requirements, and slow solutions should still pass. Of your solution was timing out, it either had a bug and fell into an infinite loop, or was exceptionally slow ;)
OP solved it, closing
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Don't use global vars, they keep their value between tests, not a kata issue.
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Some of the solutions I'm seeing from collegues, they don't check if the number is less than 0. Is that right?
I think for most solutions using a loop, if you start the loop above 0, it never checks for values below 0.
natural numbers
cool how my function works as expected in VS Code but its failing here... ?
Please read the error message:
A const value can be assigned only once.
Cant thank you enough Chrono, I was going bald from this question. its always the little things.
...and remember what Chrono teaches us; error messages can be your best debugging friends!
...secondarily, keep in mind that your VSCode probably does not have all the same tests / cases that this site will have, so it will almost certainly be invalid if it doesn't match. The phrase "but it works on my machine" comes up rather often, but as equally often, it proves futile for the reason provided.
expected:<23> but was:<33>
????
Please read the description again, there is an example there.
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With this (no-)formatting, I can't even tell what language is this.
Please see this paragraph how to format code blocks properly.
Totally BELOW. Never equivalent.
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Numbers below 10, but not including 10
i am not understanding it want to return the negative values even it only wanted to get the sum of the numbers that are divisible by 3 and 5 and that's 33165.
Nice!
instructions didnt say anything about negative values. Obviously if you include those the solution of every input has to be negative infinity. I think you dont need to mention it in general, but it tests for a negative value explicitly, so you have to make assumptions.
In what language?
VB, does the description differ in the languages?
It should not differ, but sometimes it can. This kata used to have some bad note about negative numbers and I tried to make it clearer, but forgot to include VB.
I added the paragraph in VB, but I think I just need to finish adding negative numbers to all languages and make the paragraph about negative inputs not a conditional one.
or just remove the test for negative number. In think in that case you dont need an explanation. You return 0 anyways in that case, so nothing to gain from it
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Hi Mango22. I see you are a newcomer, so welcome. First of all, please don't raise an issue when you see your code is not working. Issues are for demostrated flaws in the kata design. You may rather ask a question. Secondly, please use format tags when you post code somewhere, or it is very discomfortable to read, as explained there: https://docs.codewars.com/references/markdown/#code-block
You are using
my_listas a global variable. In general you should be very cautious when using global variable, they can be useful in determinated cases but they are not reinitialized at each function call, that's why the result will be correct the first time, but incorrect then. You must define your output list inside the function, so you get a new empty list each time a new input is provided, to avoid this.Hey, thanks for the patience (and explaining the basics of this site). EDIT: solved it, thanks!!!!
Nice. Also note you could have identified the bug in your code by printing intermediate values, using
print.Too easy for 6 kyu
most of the solutions use loops, this one can be done without loop. Probably some test for very large number with time limit should be added.
looks nice tho
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Not a kata issue, please read this: https://docs.codewars.com/training/training-example
Things you should fix in your code:
Also read this: https://docs.codewars.com/training/troubleshooting
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Please read the error message:
That's a problem with your code, not a kata issue. Use
Questionlabel next time.Oh I apologize for the misuse, I will pay attention next time, it's my first time using this tool. Thank you for helping me out !
Easy +1
Too easy for 6 kyu, isn't it?
C Fork
Approved
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It's a problem your code. You need to return, not print. See https://docs.codewars.com/training/troubleshooting/#.print-vs-return.
Seeing you're new to codewars, I also recommend reading the following article: https://docs.codewars.com/training/training-example.
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for me it said that i was wrong in the practise where n = 3 and n = 8: i got 0 and 14 respectively, if you got the same, just try and atempt it as that is what i did
Why can I not use a Set here?
test expected:<23> but was:<233168> Stack Trace
Whats this? i checked my code with answers and ig its correct?
Your solution is not correct, it works only for number = 1000. What if number is 100? or 42? or 100000?
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Below the number, 10 is the number, so 10 can't be one of those multiples.
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.
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Function's name should be
solution, notsoluction, fix that and your code will work.This comment has been hidden.
Return the result, not print it.
i have completed the code and i got the output too, now what should i do ?
Delete main method from your code.
can ypu plese tell me the algo that youve used
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Don't post solutions in Discourse please.
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Use the function's argument to get the input value, not input(). Also, mark your post as having spoiler content next time, please.
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because if you have number<0 you need return 0. Why are you check if i < 0: in your loop?
Too easy for kyu 6
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You forgot this.
Thank you, forgot the age old rule to always read the full question.
you are counting 15 twice, so 75-15 = 60 is the correct answer
sir you have included 15 twice
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Please see if this article helps: https://docs.codewars.com/training/training-example#writing-a-solution
Really fun one :)
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Knowing your code would greatly help to find your mistake.
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Having the code properly formatted would greatly help too.
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Your solution has a small bug. You need to read the description again, and pay attention to details.
Your solution is not exactly correct (but it's close), it's not a kata issue.
thank you for helping!
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Read this: https://docs.codewars.com/training/troubleshooting#post-discourse
Remove the first line, you don't use
input()here, use the function's argument. Also, read this: https://docs.codewars.com/training/troubleshooting#expected-the-samebe careful with instructions, i needed to read it four or Five times to get my solution work as expected
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read the instructions carefully, start with the given exemple then try to make a program that do the same :)
This was quite easy. feels good after solving it.
Basically fizzbuzz in another format
Remember！: If the number is a multiple of both 3 and 5, only count it once.
it's a pity that there's only one color in the description
I tried to use a do {command} while (condition) thing but event the easiest already breaks the algorythm
i don't really understand the instruction. can someone enlightnen me?. thank you
Mine was complex but I took out all numbers that fit the conditions, put them in an array and i took the sum of the numbers in the array.
use set() that will only take the unique number. because we don't want the number's that are both multiples of 3 and 5.
So in a fit of rage I deleted everything and closed out the tab but when I tried to go go back I couldn't undo my deletion what do I do
There is None unless you had a file on your pc, in wich case you can use recovery tools like Recoverit - Data Recovery
DO NOT leave console log, when you attempt. It shows error, because of a full buffer.
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Not a kata suggestion, please make all those comments in your solution if you want, but here, the kata should be solved on your own.
i have a problem. i write a function to do this named 'sumMult' and i declare "n" and at the end of the code i set sumMult(n), but i can't pass that. how should i complete i complete this? the code is ok and i test it in vscode. im new here plz help thanks. i use javascript i get this error: "ReferenceError: solution is not defined at Context. (test.js:22:18) at process.processImmediate (node:internal/timers:471:21)"
Use the initial code:
The function's name should be
solution, notsumMult. So rename your function and if it's ok, it should work. Btw, it's not ok.Instructions say that it returns the sum of all the multiples of 3 or 5 below the number passed in". The number passed in was 20, so it shouldn't be added, right? But the answer expected me to sum it.
Which language are you saying that happens? That isn't happening neither in TypeScript nor in Java, that are the two languages you worked on.
Facing a problem:"random cases: n=78439 - STDERR - Execution Timed Out (12000 ms)". Any help with this big numbers?
Don't use nested loops.
Ok, thanks bro.
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I only know c++, so forgive me if I'm wrong, but as far as I know the operator
+=is shorthand for= number +, so your line equalscount = count +;which gives a compile error.You should replace the line to
count++;if you want to add 1 orcount+=(another number);Now I should note that the number is already given as a parameter so you don't really need to ask for it again.
i do not think its is 6 kyu, looks like 7.
My scala code passes all the tests expect when n=100000 since answer is too large to be displayed as an integer. Can someone explain how you're supposed to return an integer that is too large to be returned?
I have the same issue, can anyone help?
Edit - I figured it out, you need to make sure your counter variable is of type Long
Hi! How is this problem solved with the local compiler?
EOFError: EOF when reading a line
This often means you're missing a closing bracket
Hi, bro! Reset the code and noticed that it was necessary to write code in the function, not enter values through the input and output the answer, not print. Everything went well!
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why is this problem 6kyu? it's a simple fizzbuzz variation
It is one of the oldest katas on the site, back from March 2013 - the rating system was more generous back then (and still being adjusted I guess also).
ah, i see. thank you for the explanation
Python 3.10 - Times out after first test
Issues are for problems with the kata, not problems with your code. It sounds like your code is too slow, or perhaps gets caught in some kind of loop. You can post your code here (make sure to mark it as a Spoiler) if you want help debugging it.
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This task good for level 8 but not 6.
The test is not checking the NEGATIVE inputs. It should be fixed.
The most popular code in answers is wrong.
Please mention the language when reporting an issue. If it was Swift, it doesn't have random tests either.
Yeah, right, it was Swift. Thank you for comment
Added some fixed tests with negative values in Swift. There is an open issue about the lack of random tests below, so closing this one.
Same in R, if I'm not mistaken.
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error CS0305: Using the generic type 'List' requires 1 type arguments. whats wrong? in visual studio work but here not
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Please read this: https://docs.codewars.com/training/troubleshooting#post-discourse
About your problem:
The sum, not the count.
Thank you it worked
I encountered some problems. (C#) When i used int local variable in method, everything worked well. But when i initialized static int field in class (instead of variable in method), I've got problems with some tests(with inputs 20 / 200). Problem itself: out of nowhere to my summ on return was added 23, no matter how i changed my loops i always got additional 23, this problem was occured only on CW, while in VS everything went fine(right answers without addtion). What's root of problem. How static field affect result?
Your tests most probably would not work correctly in your local VS either. It will most probably fail if you run two test cases at once in your local VS.
Yep, probably. I thought about separate start of programm, if it's few calls of method in a row, then it's reasonable.
Thx, bro.
The outputs I got were incorrect if n = 75, how can the sum be 60? same goes for n=93, sum = 78 and n = 10308 and, sum = 9168.
Edit: the outputs are different from the sample tests for some reason
You're misreading the logs:
n is 16, and 75 is your wrong answer. 60 is the right answer. Not a kata issue, please read this: https://docs.codewars.com/training/troubleshooting/
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You're printing your output instead of returning it.
Appreciated. This helped me in my later submissions as well, and general understanding of writing functions. Thank you!
I love how this kata made me learn so much about ways to add the elements in an array and get rid of duplicates in an array, thank you sensei @jhoffner
I dont know why I am getting an ImportError. my code runs fine but its saying "cannot import solution from solution" im so confused.
In all Codewars katas your returned code/function needs to have the same name as what appears in the Preloaded code.
In this case - confusingly - the kata wants you to return a function called
solution; you have changed the name tosumAPandsumMultiples.Renamed your function
sumMultiplestosolutionand it should workthank you
I love this kata! It can be solved in so many ways! I suggest you try the following:
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definitely not 6 kyu, it's way more easier than some 8 kyu
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missing test case for:
Additionally, if the number is negative, return 0
Missing in which language?
Elixir
There was already a single test for that, added another one, and expanded the random range.
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First of all, welcome to Codewars.
In general, if you want help it's best to state which language you are working in (so people can double check your code and/or the tests in the various versions of the kata).
As for your query - there is indeed a test with
n=200 -> correct answer = 9168so it seems that maybe you are reading the error messages incorrectly?As a new user, make sure you read this useful page completely:
Troubleshooting Codewars - see especially the section on "Error messages, printing your input/output".
If you see
"...but returned 0"this normally means (depending on language, hence my comment earlier) that it is your code that is returning 0.If you want to hard-code this, to debug, try writing:
if N = 200 return 9168- this will let you know if the tests are working OK in your language.It should be 8 kyu instead 6 kyu
It's one of the oldest katas on the site so ranking/difficulty grading is a bit out of date.
Besides, if you think it is too easy; why not try to solve it in O(1) rather than your O(n) solution which times out for inputs ~
100,000,000?8 kyu and I can't complete this task :\
this was hard for me as a beginner, took me like 5 hours to figure out
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This kata is a subject to deduplication process here: https://github.com/codewars/content-issues/issues/133.
Please join the discussion to help us identify duplicate kata and retire them.
This kata was decided to stay.
I do not really understand the instruction. We are given a list of the natural numbers below 10. Why do we need to check for anything negative? And why the attempt suggests that the result of the calculation must be 78?
P.s.: I have submitted it, but I think that the Instruction must say that we have a list of natural elements below "number". And I still do not understand what it was with negative numbers.
You are not given a list of natural numbers, you are given a single number - the "upper limit" for you to consider.
If the upper limit is 10, for example, then you need to find which natural numbers below 10 are multiples of 3 or 5: as stated in description, these are 3,5,6,9.
The reason you check for "anything negative" is that if the input number is negative, then there are no natural numbers smaller than it, so the answer is
0.The "result of the calculation" you are looking at, is for 1 specific test: with input value of
20the correct answer is indeed78because the sum of all natural numbers less than20that are multiples of 3 or 5 is:3+5+6+9+10+12+15+18 = 78I still do not understand why the result of calculation is 78, in the task the number equals 10, not 20. Explain please.
if the input is 10, the function should return 23
if the input is 20, the function should return 78
So it is saying 6 should = 8... 6 is comprised of 3, 5, and 6, which total 14. What am I missing here?
Firstly make sure you are interpreting error message correctly:
x should equal yin python tests mean that you are returning x and the correct answer is y.Also, based on quickly reading your solution, make sure you read description:
"...sum of all the multiples of 3 or 5 below the number passed in..."
My mistake, I missed the crucial part of the instructions where it says to sum the numbers that are less than the input. Got it now, thanks!
@coreymccue no worries!
It's a very common little mistake, especially when the
input/outputspecs of katas are written in plain english rather than using precise symbols like<vs<=.Welcome to Codewars by the way, and best wishes on your coding journey (by the way, you may be interested in the Codewars Discord - link in the sidebar on the left - where you can ask questions and generally get help quicker as you're starting out).
Passed the test, but programm doesn't check the latest number. First used for i in range(number + 1) but system didn't let me go. Some tests matched, some - not, so it gave me a clue that something wrong with the cycle ranges.
I am getting crasy. I have attempted my code so many times without success. I wrote all my variables in the function body and it works.
Your code worked.
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16 = 60? not 75?
OP left the building... closing
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Use proper indentation, your
return totalis inside your loop. Read this: https://docs.codewars.com/training/troubleshooting/ please.D translation
Approved!
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Rust fork
Approved
C# fork
Approved.
What's the problem here my output is right in all tests but i get this Should return 3 for n=4 Log 3 None should equal 3
In Python the error message format is like this:
what_you_returnedshould equalwhat_the_actual_correct_answer_isSo in this case,
Noneshould equal3, means that you are returningNoneand the correct answer is3.If you get the correct answer on your PC, maybe check that you are actually
returningyour answer rather than just printing it?thank you I used print instead of return
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Logical and is
&&, not&. Your code is too slow, don't create arrays.You're counting them twice.
Thank you very much!!! I got it :)
Hi! maybe I misunderstand the condition?
Note: If the number is a multiple of both 3 and 5, only count it once.
But how can it be if all the tests pass and the last one does not?
I add only 1 element to the general list which is a multiple of 3 and 5
I can't figure out what the error is, help!!!!!
Should return 9168 for n=200 7818 should equal 9168
This is, at most, a question, certainly not an issue (= a problem in the kata itself).
and what to do then?
Debug your code, you're not understanding what to do:
That doesn't mean you count 0 and 15 and discard all other multiples of 3 and 5, it means you don't count 15 once for 3 and once for 5, that's what it means.
What happens is that the tests stop as soon as your function returns an incorrect answer.
The test cases dicourage efficient code. The original problem asked us to calculate for the number 1000, while the highest test case is 200. I think timeouts should be implemented and more extreme tests given. For example, my solution can get a result of 1890045000 from an input of 90000, in almost the same time as a low number. Going any higher gives the risk of breaking the ceiling of a signed Int32 (which can be be fixed by changing to an unsigned int32, or even an Uint64 hahaha).
Changing the test cases to a higher value will encourage mathematical thinking and efficient coding habits. This would also have to be reflected in the explanatation for the problem. I am new to codewars, so I don't know if there is some sort of "bonus points" system, which would fit this perfectly.
This kata is old, has been solved a huge amount of times, and changing its design in the sense of your suggestion would invalidate most of the submitted solutions, and actually would make it a completely different kata. This is not going to happen. Howerver, there exists a good amount of more challenging katas relative to arithmetics and divisibility for those who are interested in it..
And to answer to your last question: No, there are no bonus points here. The tests don't analyze your code; they just control your answer (I think this would just be practically impossible).
for python, it's too easy for a 6kyu, it should be 8kyu for py
Ranks are shared across languages and cannot be changed. It's not useful to complain about that, just enjoy the cheap points.
I think the developer programe is cracked
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This is not a kata suggestion, it's a recipe for solution, please don't post this in Discourse.
Thank you. oops I got it
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Please don't post solutions to katas without using the Spoiler flag below the text box - everyone can see your answer on frontpage.
Also, no need to post your solutions on Discussion page; you can use the Solutions page to comment on your & other peoples' solutions.
Finally please if you want people to read your code in future, use Markdown to format your code otherwise it is unreadable - read the documentation here to learn how to do this:
How to format code in markdown on codewars
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Please use a spoiler flag when you post code, so that users who didn´t solve the kata cannot see it; I put the flag on for you this time. Also use markdown tags to format your code or it's not usable. Refer to the documentation about this and more: https://docs.codewars.com/training/troubleshooting/#post-discourse
&and^operators probably don't do not what you think, refer to the documentation of your language.Too easy to be 6 kyu...
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Please don't post solution code in the discourse without marking it as a
Spoiler.You are printing the result. You should be returning it.
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Please use a spoiler flag when you post code, so that users who didn´t solve the kata cannot see it; I put the flag for you this time. Also use markdown tags to format your code or it's not usable. You can refer to the documentation about this and a more general help: https://docs.codewars.com/training/troubleshooting/#post-discourse
You must
returnthe result, not print it to the console, it's the same in all katas.I get this error: Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 134217736 bytes) in /home/codewarrior/run.php on line 10
I only have a for loop in line 10 where I add some numbers to an array. how can it be so big? php, im on mobile
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why do i get this "The expression (solution(10)) == ((23)) is false." even though log output is 23 in C programming
Read this: https://docs.codewars.com/training/troubleshooting#expected-the-same
Your function always returns 0.
Not a kata issue.
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The note got removed for languages which have no tests for negative numbers.
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Had a solution in my IDE with no problems. Copy pasted and passed all but one test saying "0 matches 23" or something along those lines.
Left this site, came back, retried, and passed all tests with exact same solution.
Very cool.
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You need to return the result, not print. Also, please format your code when posting or it's unusable: https://docs.codewars.com/training/troubleshooting/#post-discourse
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Hi. Please use markdown tags to format your code or it's not very usable, as explained there: https://docs.codewars.com/training/troubleshooting/#post-discourse
You need a 'return' statement at the end of your code. Right now you are only returning a result if n is negative. If n is positive you aren't returning anything so output is undefined.
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It's very ambiguous that C# has almost nothing to test then you submit your solution.
OP left the building... closing
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Your solution will recurse up to 100000 times with some tests in the test suite. This is too much for codewars' node.js stack size. I'm not sure what it is in bytes, but I set up a recursive function that increments a single value and then calls itself and then prints that value upon an exception. With this function, it seems codewars' stack size will allow 15630 recursive calls (at least for my test function) before throwing an exception. I think you'll have to find a non-recursive solution, or at least a solution that doesn't recurse so deeply.
Thank you so much BobtheLantern! I was able to solve it with this advice. I saw someone else had asked a similar question so I'm trying to delete my question to reduce redundancy but I can't figure out how to do it. (I'm new to this site)
also I thought I posted this in questions, Sorry about that!!
I wouldn't worry about it, the discussion page is at least partly for asking questions. I don't think it's possible to delete a comment once someone has replied to it, besides now that this chain is at the top of the discussion page, someone else with the same question won't have to go searching for an answer.
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interesting to see all the different ways to do this
simple ariphmetics :)
Sample tests Should return 3 for n=4 Log 3 None should equal 3 Completed in 0.01ms
help please
Same here =(
Please see this bullet point : https://docs.codewars.com/training/troubleshooting/#.print-vs-return
I found the solution and I wanted to write it but they beat me ;) thanks!
I had difficulty to understand the question at first. until I read the hint as "varaiation from FizzFuzz" from other comment.
"Unexpected exception raised": is this supposed to happen, no matter whether my code is right or wrong?
I think this happens only when your code is wrong.
"Unexpected exception raised": is this supposed to happen, no matter whether my code is right or wrong?
No, it's unexpected.
too easy for 6 kyu...it's 8 kyu
I agree.
(maybe 7kyu, but not 6kyu)
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3 important things:
About all this, and more, I strongly advice you to read carefully the documentation: https://docs.codewars.com/training/troubleshooting/
Also: don't post several times for the same thing. You posted an identical message just below. Please delete it if you can.
ok thanks will do. very new to all this and wasnt aware i posted in the wrong place.
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multiverse
How do i deal whit this?
'EOFError: EOF when reading a line'
Make your code end correctly.
Don't use
input()it worked, thaks =)
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This probably means you return 93 while the correct answer is 78.
but when I click on test it shows: You have passed all of the tests! first error show up when I click on attempt button. I confused finallt its write or wrong :|
add a negative number check. In other words try the function with -10 or something.
Most languages already do. And better for those that don't, since it doesn't bring any value to the task.
honestly i disagree, error checking should be part of any programmer's arsenal, this exactly how security bugs are found. and the lack of such a check has resulted in almost all answers not relating to such a case.
We're not making arsenals here, we must write a program to do a task. Input validation has been done in many old katas and is now considered a bad practice for the reason I mentionned. Checking the input is a negative number is 8 kyu kata level. It's of course interesting to know how to do that, but mixing this with a totally independent task like finding multiples of a number doesn't bring any value, in real context it'd be better to handle input validation separately from the main algorithm.
In the problem function(10)=23, but in the test the result must be 55. Useless instruccions
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you need to put the 'return sum' inside your function
@Trapyy: Please use a spoiler flag when you post code in a comment (I put the flag for you this time).
@Trapyy I've got it, thank you
@akar-0 sorry, wont happen again
When I click test my code works, I hit attempt and then theres a 12 second wait and then it says that my code took to long to run so it didnt do it. My code isn't that complicated, just a for loop that runs as many times as the input so I dont get why this is happening. Does anyone know what to do if this happens?
you need to rethink your algorithm
are you sure you're program is O(n) time complexity?
Maybe it's because an infinite loop has been produced
I fixed it aparaently the problem was a != if statement, wich was fixed by replacing it with >. Idk why the not equal didnt work and made an inifte loop but its fixed now.
where do i put my awnser?
when you train on a kata, you have 3 boxes visible on the screen. the left box has the description and the output of the program. the right middle box has your code editor. the bottom right box has the sample tests
you can see this for more details
It says you should only return 0 if negatives aren't supported in your respective language but if you return the sum of the negative multiples of 3 or 5, it gives an error.
That's not what it says, it says if there are negative numbers in the tests in your language, return 0.
why my code work in my comiler and don't work in the website.this website don't give me sample input and sample output to test .bad website i will continue in codeforces
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I think it is a bit to easy for 6 kyu
assert_eq!(solution(-1), 0);
Why does this not test negative numbers?
your language possibly doesn't have them
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yeah
Why don't you add more example test cases ?
you can add/edit/remove example test cases yourself based on examples that you want to try
note that this is only local and does not affect the kata itself
i can code. i just don understand the task...
a piece of piss for 6kyu;
Is your solution's time complexity is O(1)?
yeah my solution is satisfy the O(n) time complexity with O(1) space complexity by using 1 loop and 1 variable
Time complexity of your solution is not O(1), it's linear (i.e. O(n)).
This was kind of easy, a variation on FizzBuzz
good kata for beginners, there are many ways to solve it
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The first paragraph of the task kinda brings confusion and is unnecessary imo
is there any error in this question, i ducble checked it for the vaue of 23 and the answer supposed to be 119 but its saying 70
You are probably reading the feedback off-by-one. The log appears above the test result.
COBOL translation (new framework)
Approved
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If you mean
conio.hthen its not installed on Codewars, but you also do not need it. What would you need it for? Your solution should not interact with console in any way.No random tests in C++
There's random tests in C++, you must have select wrong language