Note that you fixed the example solution as well. If you are going for 7 kyu, a naive implementation of the description should be valid. Now, you don't know that, because you're testing a solution that is better than that.

Haskell translation

• this translation modifies the description to solve the below issue
• this translation tests up to 12 instead of 13, because the naive description solution can't do 13 in Haskell

Be careful approving translation before your kata is approved!

constraints: 0 <= n <= 14 0 <= k <= 14

that should be < 14 in both cases. also, a line break would be nice ( two spaces at the end of a line will do that for you in MarkDown ). a bullet list would be even nicer.

Thanks for the suggestion. I clarified the description to hopefully be mmore clear.

Alright, I fixed it. This is my first kata but I definitely should have created a better solution. It is fixed now to include memoization to make it run faster.

or does Rust have some sort of automagic memoisation and am I talking out of my behind?

An example of the shape of the triangle and of "the next element", "the previous element", and "the element above that" would be nice.

I got a wrong impression from the text initially; "that" in "the element above that" is doing an awful lot of work, but I read it as "it" and got all confused.