No user translated this challenge to Java, C, C++, or JavaScript. Feel free to do so if you think that these languages are missing ;)

only python and c# ?
where java, c, c++, JavaScript?

I don't think that it's one of the best solutions: here filter is called two times, so it's likely that you iterate two time on input, which is unnecessay. This can be solve with a vanilla for loop & one if.

I still have no idea what I'm expected to do. Somehow, I pass all sample tests but fail on many random tests. This means the sample tests are pretty much useless. There's nothing positive I can say about this kata, except "Good luck with it".

Peformance tag should be added , i solved it but i got timeout error because my solution is O(n) ,
i should find another way to solve it and hate this really because im still beginner and i did not know its need a solution O(log n) :(

Ok, so I'd rather keep the current phrasing as it is and simply require the return type to be a list of length 2. I may be wrong, but I think the dicussion around this is becoming too academic. So, I think it's ok if I mark as resolved.

I'm fine If the tests only requires [0] and [1] to be possible (or some specific destructuring requirements). But currently it explicitly requires a list to be returned.

that is because our mind reads what it wants to read, not what is written

Thank you for the comment. For my response I'd like to clarify that I'd like to learn and understand the norms and best practices. So, I understand what you are saying. However, I responded earlier to the issue raised by hobovsky below. They suggested that "returns a pair of integers" is ambiguous and so I changed the problem specification to "list of length 2 of integers", and added tests to test that. It seems to me now that you are suggesting that I should revert back to the previous ambiguous specifiation and only test for deconstructability into two components. I would highly appreciare further input here as to what is a better solution between these two apparently confilicting suggestions. Thanks in advance.

Thank you very much. I can't believe I missed that typo for so long.

Description typo: "a linear equation in two unknowns is any equation of the form ax+bx=c". I believe it should be ax+by=c.

Currently the test is explicitly testing that the returned result is a list, which is pretty pointless: you're destructuring to the result anyway, and destructuring does not depend on the result being a list of length 2 (it only requires that the result is destructurable, either by index or by name); and in any language where tuple or similar things exist they are infinitely better than returning a list.

Also, can't the test handles non-destructurable values better? It is better to just wrap the whole thing into a try-catch block than doing the above.

Thank you. I added a test to accept a list of length two and updated the description accordingly. I'm now not getting any terrible crashes on weird outputs.

and returns a pair of integers

It's not explained how the pair is supposed to be encoded. A tuple? a list of length 2? Both seem to work, is it up to a user what they return?

Additionally: tests crash badly when an unexpected value is returned, like None or [ ] or [0, 0, 0]. Tests should verify that the form of the result is valid before they try to use it and crash.

Solved.