After going down the wrong track for ages I've finally got it over the line. Seemed much harder than the other 5 kyu kata.

Aha, brilliant, thanks. Now using malloc rather than static. That bamboozled me for ages. Added 'const' back into the comparator and not using 'sizeof(char)'. Great help, passing now, thanks. Coming from higher level languages to come and grapple with memory management and pointers is something I'm finding really hard!

I see my c solution crashing the test with "Test Crashed Caught unexpected signal: SIGSEGV (11). Invalid memory access." but I'm not seeing why. Any help please?

The esolang series is really interesting and I'm delighted to have got through it. This last one, boolfuck, could have better instructions. A lot of time was spent figuring out what was meant rather than solving the problem.

Me too!

Ah yes, *lg, thanks, I'm a bit further along now. Please mark as resolved.

The questioned is answered but not resolved. Increasing packet length and so forth isn't affecting whatever the fault is afaics. The specific test case failing is reporting that my 'encode' function is not returning anything where it is passing without fault in my local environment. Without being able to get it to break locally means I can't debug it. It is expecting {"ijJ tipvme ibw", "f lopxo uibu z", "pv xpvme ibwf ", "b qfsgfdu botx", "fs gps nf!!!"} which is what I get locally.

Thanks - well spotted!

I'm at a loss as to why my C code isn't returning anything. My solution is based on the "First Variation on Caesar Cipher" which was fine. It's all sweet on my local system. What am I doing wrong?

C version: This was tough but many learning points taken. Allocating memory! Wow!

A lot of dust had to be blown off my school maths to get this to pass efficiently. Thanks for the challenge - boy I found this haaard!

This might be a bit late, but what is meant by 'earlier pair' is the pair taken together has an upper index that is lowest of all. I think the explanation to the kata has been updated recently to spell it out.