I'm very glad to invite you to my contest Codeforces Round #700 (Div. 1) and Codeforces Round #700 (Div. 2), which will be held on Feb/07/2021 17:35 (Moscow time). In both divisions, you will be given 6 problems and 2 hours 15 minutes to solve them. One of these problems is interactive, please see the guide of interactive problems if you are not familiar with it.
I would like to thank:
rejecting problemshis amazing coordination and discussion.
all his rejected problemsbecoming the protagonist "Homer" in our problems in honor of his contribution.
all her rejected problemssharing problem ideas and selecting the date of this round.
choutii for discussion and being the first tester of this round (even before the testing phase).
300iq, _cherry_, demon12321, dorijanlendvaj, gamegame, growup974, Heltion, HIS_GRACE, Invincible06, jiangshibiao, JOHNKRAM, littlefriend, lucifer1004, lyuankai, Milesian, mohammedehab2002, moreD, p_b_p_b and rkm62 for testing and their invaluable feedback.
MikeMirzayanov for the great Codeforces and Polygon!
I have tried my best to write clear problem statements and make strong pretests. I hope you like the problems and enjoy the round.
The anti-traditional score distribution (yes, very early, that's why we call it anti-traditional; I love early score distributions!) is given as follows:
Div. 1: $$$500 - (750 + 750) - 1500 - 2250 - 4000$$$
Div. 2: $$$500 - 1000 - 1500 - (1500 + 1500) - 3000$$$
UPD: Editorial is out.
UPD1: We are sorry for the issue with the problem D2B and for D2C=D1A turning out to be well-known. Constraints for D2B were changed from $$$10^9$$$ to $$$10^6$$$ and all submissions which didn't get AC during the contest were rejudged.
We apologize once again and thank you for your participation.
UPD2 Congratulations to the winners:
Also congratulations to hos.lyric (the only contestant who solved E during contest time!)