A game of tiles

I want to know how to approach this problem?
I am attaching screenshot.

hi… i cant see any screenshot… send it again…

sry bro… we cant help during an ongoing contest or hiring challenge…

I hope I’ve cleared your doubt. I ask you to please rate your experience here
Your feedback is very important. It helps us improve our platform and hence provide you
the learning experience you deserve.

On the off chance, you still have some questions or not find the answers satisfactory, you may reopen
the doubt.

This question is from contest that is already over.