We are delighted to announce that TOKI Open Contest Special — April Fools is coming again this year!
Moreover, for the first time, we also open this to non-Indonesian coders! :D

TOKI Open Contest Special — April Fools 2018 consists of "unique" and "oddly satisfying (or annoying?)" problems.
Of course, there is no division of division. And oh, every problem is written in English only right now, :)

You may see last year's problems of TOKI Open Contest Special — April Fools 2017 (only in Indonesian language) or Codeforces April Fools Contest 2017 to grasp the idea of what kind of problems you'll face.

TOKI Open Contest Special — April Fools 2018 is written by Ammar Fathin Sabili (athin) and Alham Fikri Aji (afaji321).

This contest will be held on Sunday, 1 April 2018, 19.00 — 21.30 Western Indonesian Time (UTC+7).
Yes, it will end around 1 hour before Codeforces April Fools Contest 2018! (You may use this for practice, right? :P)

Several details related to the contest:

1. The contest will use ACM-ICPC scoring type and usual classic contest ACM-ICPC rule that is very strict about newline and whitespace.
2. There will be ELEVEN (11) problems with various difficulties but the weight for each problem is the same. The contest duration is 2 hours 30 minutes.
3. Any non-Accepted submission WILL NOT GET ANY PENALTY.
4. The rank will be sorted according to the most number of solves (problems with Accepted verdict). If there are ties, it will be determined by least sum of solving time.
5. The contest will be held on https://competition.ia-toki.org/contests/267. Registration is already opened at the same place. Registering the contest requires a TLX (http://competition.ia-toki.org) account. You may need to register for an account if you don't have one.
6. The allowed programming languages are C, C++11, Pascal, Python 3, and Java 8. However, please note that we do not ensure that every language can solve all the problems on the given time limit.

Are you ready? Great! Wish you all the best, good luck and have fun! :D

UPD 1: We'd like to thanks Agus Sentosa Hermawan (aguss787), Anthony Ng (anthonyhkf), and Muhammad Ayaz Dzulfikar (ayaze) for testing this round.

UPD 2: Congratulations for the winner of TOKI Open Contest Special — April Fools 2018!

1. fuyangzhi

2. pwypeanut

3. Firastic

4. Reiva5

5. chaotic_iak

6. pwild

7. faustaadp

8. Yoshiyuki

9. wijayareynaldo

10. [user:kobusteosousa]

The problems are available at https://training.ia-toki.org/problemsets/109/problems for upsolving. See you at the next TOKI Open Contest! :D