Codeforces Round #630 (Div. 2)

#	User	Rating
1	tourist	4009
2	jiangly	3831
3	Radewoosh	3646
4	jqdai0815	3620
4	Benq	3620
6	orzdevinwang	3529
7	ecnerwala	3446
8	Um_nik	3396
9	gamegame	3386
10	ksun48	3373

#	User	Contrib.
1	cry	164
1	maomao90	164
3	Um_nik	163
4	atcoder_official	160
5	-is-this-fft-	158
6	awoo	157
7	adamant	156
8	TheScrasse	154
8	nor	154
10	Dominater069	153

Hello Codeforces!

I am glad to invite you to my first official round Codeforces Round 630 (Div. 2), which will take place on Mar/31/2020 16:35 (Moscow time) (please note for the unusual starting time) and will be rated for all Division 2 participants.

You will be given 7 tasks and 150 minutes to solve them.

All tasks in this round were prepared by me. Hope that you will enjoy those tasks!

I would like to thank:

awoo for great coordination of this round, and the idea of solution of one task!
Nanako, Nezzar for useful discussion and testing this round!
antontrygubO_o, McDic, vovuh, TBeumsJryi, socho, Oak_limy, Amori, Stresshoover, I1I1I11I1I1, defolaut, hx073269 and Pavlova for testing this round and invaluable suggestions!
MikeMirzayanov for great systems Codeforces and Polygon!

To avoid queueforces, we will provide small amount but strong ~~(hope so)~~ pretests for first few tasks. Hope it works!

Score distribution will be announced later.

Good luck and have fun!

UPD1: Score distribution: 500-1000-1250-1250-1750-2250-3000

UPD2: Contest is over, and here is the editorial.

Rev.	By	When	Δ	Comment
en22	triple__a	2020-04-01 05:47:55	4	(published)
en21	triple__a	2020-04-01 05:47:17	847	(saved to drafts)
en20	triple__a	2020-03-31 19:33:34	0	Tiny change: ' editorial.\n' -> ' editorial\n' (published)
en19	triple__a	2020-03-31 19:33:14	98	(saved to drafts)
en18	triple__a	2020-03-31 11:50:40	2	Tiny change: '250-3000\n' -> '250-3000\n\n'
en17	triple__a	2020-03-31 11:49:51	65
en16	triple__a	2020-03-30 12:14:19	0	(published)
en15	triple__a	2020-03-30 12:12:08	94
en14	triple__a	2020-03-29 18:22:28	20
en13	triple__a	2020-03-29 13:39:11	25	Tiny change: '9], [user:S' -> '9], [user:Amori], [user:S'
en12	triple__a	2020-03-29 13:03:41	4	Tiny change: 'for first tasks. Ho' -> 'for first few tasks. Ho'
en11	triple__a	2020-03-29 13:02:51	24	Tiny change: 'te you to [contest:' -> 'te you to my first official round [contest:'
en10	triple__a	2020-03-29 13:02:11	16	Tiny change: 'tasks and tasks and point distribut' -> 'tasks and score distribut'
en9	triple__a	2020-03-29 09:26:39	4
en8	triple__a	2020-03-29 09:25:42	48
en7	triple__a	2020-03-29 09:18:26	82
en6	triple__a	2020-03-29 09:16:48	20	Tiny change: 'orces, we provide s' -> 'orces, we will provide s'
en5	triple__a	2020-03-29 09:14:22	6
en4	triple__a	2020-03-29 09:13:06	9	Tiny change: 'o thank:\n- [user:' -> 'o thank:\n\n- [user:'
en3	triple__a	2020-03-29 09:12:10	988
en2	triple__a	2020-03-29 08:53:27	116	Tiny change: 'aaa' -> ''
en1	triple__a	2020-03-29 08:50:22	6	Initial revision (saved to drafts)

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