The FIICode Final Round will take place Saturday, from 7AM to 10AM (UTC).

We will host an online mirror on CSAcademy at 10:05 (UTC). It will last 3 hours. We invite everyone to join.

Edit: mirror link The difficulty will be similar to a div 1 Codeforces contest. This round will be rated :)

Auto comment: topic has been updated by Juve45 (previous revision, new revision, compare).Auto comment: topic has been updated by Juve45 (previous revision, new revision, compare).Rated contest in CSA :o

The solutions have just been published, with extra bonus challenges.

Can you solve problem F's bonus challenge?

Even though the editorial for E is simple, there is another easy solution to E (one with no edges cases);

We can treat this as a 1 player game for P1. For each removal of a $$$b$$$, P1 gets 1 point. After all operations, for each sequence of $$$X$$$ $$$a$$$'s, P1 loses $$$\lfloor X/3 \rfloor$$$ points. P1 wins iff the maximal amount of points he can get is positive.

We can solve with dp: $$$dp_{i, j}$$$ is the maximal amount of points P1 can get, if we only consider the prefix of length $$$i$$$, and the last sequence of $$$a$$$'s was of length $$$j$$$ (modulo 3). Transitions are easy in constant time.

That’s right. In fact, both our accepted solutions for E were done using this idea. (during the contest)

i am unable to submit to the tasks on CSA since the contest has ended. does anyone else have the same issue?

Can you try again now?

thanks, i'm able to submit now