Hello everyone!

Will you be single and bored during Valentine's Day? Never fear, as zscoder is here to cure your boredom.

I would like to invite you to Valentine's Day Contest 2020, which will take place on Friday, February 14, 2020 at 12:30 GMT. The contest is unofficial and unrated, but the quality of most (if not all) of the problems are comparable to problems from a Codeforces round. I am the author of all problems.

The contest format will be IOI format, which means that each problem is worth $$$100$$$ points, and there are subtasks for each problem. There will be no time penalty. The problems are not sorted in increasing order of difficulty. Unlike IOI, you are allowed to use any templates or notes you have.

There are 7 problems to be solved in 3.5 hours. There is an interactive problem, so feel free to learn about them here.

There will be a special shoutout to the first person to AC for each problem (and also the first person to get all 7 ACs >_<).

The difficulty of the contest is aimed at higher-rated Div. 2 (Expert) to mid-red (low International Grandmaster) level participants but everyone is welcome to join the contest. Of course, if you are not single and are still free to join the contest, you are welcome to join as well. XD

Thanks to the testers Kuroni, tmwilliamlin168, duckmoon99, gamegame, ToxicPie9, dorijanlendvaj, kostia244 and alimq for testing the problems and MikeMirzayanov for the wonderful Codeforces and Polygon systems that made this contest possible.

The contest will be held (tentatively) within a Codeforces group and the link will be posted later.

UPD: The contest will be held as a training contest on Gym. (which will appear later) The contest is now available on Gym. Registration opens $$$6$$$ hours before contest starts.

If you are a coach in Gym, remember to disable coach mode before joining the contest. ^_^

I will be on the AC Discord server to discuss the contest after it ends.

Hope to see you in the contest!

UPD 2: Contest is over! Thanks to everyone who participated and made this Valentine's Day less lonely for me. Congratulations to the top 10:

Rank 1: Radewoosh (with 577 points)

Rank 2: jiangly and 244mhq (tied with 500 points)

Rank 4: NoLongerRed (with 426 points)

Rank 5: sigma425 (with 409 points)

Rank 6: noneTP (with 351 points)

Rank 7: wygzgyw (with 345 points)

Rank 8: chocorusk (with 340 points)

Rank 9: BigBag (with 334 points)

Rank 10: waynetuinfor (with 326 points)

Also, here is a shoutout to all the "first to AC"s:

Problem A: sigma425 at 00:16

Problem B: Unsolved during contest time :(

Problem C: 244mhq at 00:25

Problem D: TLE at 00:44

Problem E: TLE at 02:38 (and only AC for E during contest!)

Problem F: Moniphant at 00:12

Problem G: shirakami.rin at 00:24

UPD 3: The editorial is here!