yes, the root author gets credited

added

approved

read the assertion message, not the line of code:

Invalid result for s = "", part1 = "ac", part2 = "ab"
Expected: false
Actual: true

size_t counts[36];
memset(counts, 0, 36 * sizeof(size_t));

can be just

size_t counts[36];
memset(counts, 0, sizeof counts);

or even

size_t counts[36] = {0};

size_t index = curr < 65 ? curr - 48 : curr > 90 ? curr - 87 : curr - 55;

this line could be made more readable by using character literals such as 'a' and '0'. or just set the buffer size to e.g. 128 and use direct indexing; this is nowhere close to a noticeable memory footprint

kinda stunned that it wasn't crashing when it was set to C11!

solution now is a standard one

X goofiness removed (this was one of my first translations from 6 years ago, I've learned avoid things like that since)

thanks much

char rand_text[rand_len];

that does not account for the nul terminator, hence the crash.

also, please don't golf the Solution panel, it has to be maintainable; same remark for things like

size_t i = X - X;

approved

removed, thanks

array[index] = (int)index;

this cast has no effect. array is already an array of int, so whatever you store inside is going to be implicitely cast to an int.

approved.

language version needs to be upgraded to C18

fixed

closing as this particular behavior is indeed mentionned

should be fixed