That literally say "NULL or {-1, -1, -1}".

So why i need to return not null tab ?

Wtf bro.

(c)
If v1 >= v2 then return NULL, or {-1, -1, -1} for C.
The test part fail if i return NULL.

if (v1 >= v2)
return (NULL);
don't work

"between 1 and 50." but fixedTests() and randomTests() also include zero in c;