hi all, i have two simple questions if anyone can help.

first, please see this submission 20349642 and press the compare button. it will be compared with this submission 20349625. the code is long so don't be distracted.
what i want to know is why the first code gets AC while the second one gets Time limit exceeded on test 10. i even tested the second submission in gym and it got Time limit exceeded on test 39 (i set the time limit to 30 seconds).
i can't really see where does this huge difference come from.

second, there exists a huge difference between using vectors and static arrays. here, the size of the vector is fixed and i use passing with reference (even that the sizes of the vectors are very small 2×2). so there shouldn't be a big difference with using arrays. when i used the same code with arrays there was about 500 ms difference.
is there something to do that will make vectors faster (like using reserve function for push_back) or one simply should use arrays for a better performance?

thanks in advance. any help is appreciated :)