First Day Where You Have Been in All the Rooms

There are n rooms numbered from 0 to n-1 and you start in room 0. Each room has a distinct number in 0 to n-1, and each room may have some keys to access the next room(s). Initially, you have all the keys. The i-th room has keys[i] to access other rooms.

You can only travel to the next room if you have the key to that room. Return the first day you have been in all the rooms.