Here is a Java translation.

Nice kata!

Haskell tests do test "edge cases of unreducable 2nd string from 1st string" for about 2/3 of the time.

Ruby fixed in this fork

Lua translation !

• put actual and expected in the right order (resolving this issue)
• added math.randomseed(os.time())
• provided input on failure
• got rid of reference solution
• put fixed and random tests under a single describe

Lua translation !

I can't approve but LGTM.

Thank you !

Briefly: in the returned array every element should not have a bigger number after itself.

OCaml translation

actual and expected are swapped in Lua.

This fork should resolve the issue. I also added assertion messages and math.randomseed(os.time()).

At first, I thought it would take more than an hour — but I genuinely enjoyed solving it!
Huge thanks and congratulations — I really appreciate the time and effort you put into creating this challenge.

Ruby:

• Reference solution is wrong when output is 0

Expected: nil, instead got: 0

Java tests generate warnings:

Note: src/test/java/SolutionTest.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

I Absolutely Loved It!

Huge thanks for your effort in creating this challenge!
I truly enjoyed solving it—you’re awesome! 💯

There is a mistake in the test setup.

Actual & expected values are flipped in the assertion.

this kata's tests are fully broken in lua