C++

The resulting array shouldn't necessarily match anyone in the tests, a function just checks if the array is now wave sorted.

The vector content should stay the same

It can't be both together. If the function only checks if the array is wave sorted, it shouldn't check if it stays the same.

It's even worse: i've added

if(is_wave_sorted(v))
    return;

at the beginning of my function, and still it returns "The vector content should stay the same". So, my function only runs if the check function fails - and still the vector should stay the same?

This problem can be reduced to the set cover problem, which is NP-hard, looking at size of tests I can assume that reference solution uses some king of greedy approach, which do not guaranty optimal solution.
Example A = [3, 8, 8, 6, 7], B = [2, 2, 3, 5, 6], k = 6. My solution is 3. First thief can take from jars 1 and 4 second from 2, third from 3 and 5

Can the password be empty (eg: no 'T' at the end of directions) ? Can grid be 1x1 and/or can directions be empty (thus password would also be empty) ?

I'd like to translate the kata and I think these cases could be interesting but I don't know if I should implement them or not. I also think it could be added to the description.

suggested tag: performance

Description should be language agnostic.

python new test frameworks to be used.

Factor version expects negative answers for some n, too (had to change rem as last word to mod to pass). + description needs [1,b] -> [1..b] update for 0.99+.

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python new test frameworks

Perhaps I'm wrong but PHP tests are weird, sometimes my solution works for all tests and sometimes except the samples test, the others are failing... (Even after I submit the solution)

In Rust, the description doesn't say the returned list needs to be in ascending order, but tests fail if it's not.

description should be lanugage-agnostic

Ruby: should have sample and fixed tests where x = 0