Codeforces Round #809 Editorial

#	User	Rating
1	tourist	3985
2	jiangly	3814
3	jqdai0815	3682
4	Benq	3529
5	orzdevinwang	3526
6	ksun48	3517
7	Radewoosh	3410
8	hos.lyric	3399
9	ecnerwala	3392
9	Um_nik	3392

#	User	Contrib.
1	cry	169
2	maomao90	162
2	Um_nik	162
4	atcoder_official	161
5	djm03178	158
6	-is-this-fft-	157
7	adamant	155
8	awoo	154
8	Dominater069	154
10	luogu_official	150

Some stats about the round

Pre-contest predictions

Person	A	B	C	D1	D2	E
BucketPotato	900	1200	1400	1600	2000	2200
lunchbox	800	1300	1200	2000	2400	2300
lce4113	1000	1400	1400
lethan3	800	1000	1200	1500	2000
Apple_Method	800	1200	1200	2100	2500	2400
izhang	800	1200	1400	1600	2200
EnDeRBeaT	800	1300	1500	1700	2000	2200
Runtime-Terr0r	800	1200	1400	1800
AlperenT	800	1100	1400	1900	2400	2200

	A	B	C	D1	D2	E
Average	833	1211	1344	1775	2214	2260

Who did what?

General Credits

First, a huge thanks to IgorI! Working with inexperienced problemsetters over a 10 hour timezone difference is already difficult enough. But due to a wide range of problems with the round, the preparation process took several months. I personally have nothing but admiration for his patience and commitment throughout the entire time. He worked closely with each one of us to prepare every problem, helping us rewrite statements and redo tests over and over again to make sure they were as good as possible. He hasn't been included in this table, otherwise he would appear under every box.

Problem	Author(s)	Preparation	Editorial
A	BucketPotato	BucketPotato	BucketPotato
B	lce4113, BucketPotato	BucketPotato	BucketPotato, izhang
C	lce4113	lce4113	lce4113
D	BucketPotato	BucketPotato	BucketPotato
E	lunchbox	lunchbox	lunchbox, BucketPotato

Polygon Commits

The stats here may be a bit misleading, as many of the commits made were very minor changes (fixing typos in statements, etc.)

	A	B	C	D1	D2	E	Total
IgorI	23	23	22	35	36	30	169
BucketPotato	46	53	4	85	91	20	299
lunchbox						36	36
lce4113			38				38
lethan3	6	1					7
izhang		1					1
codeforces		2	3	3	4	5	17
Total	75	80	67	123	131	91	567

Solutions

Problem A

Solution

Code

Problem B

Solution

Code

Problem C

Solution

Code

Problem D1

Solution

Code

Problem D2

Solution

Code

Problem E

Solution

Code

Rev.	By	When	Δ	Comment
en5	BucketPotato	2022-07-20 18:20:02	53
en4	BucketPotato	2022-07-18 20:42:14	9	Tiny change: 'ubmission:164798469]\n</spoil' -> 'ubmission: 164800445]\n</spoil'
en3	BucketPotato	2022-07-18 20:34:17	619
en2	BucketPotato	2022-07-18 19:48:28	272	Tiny change: '## Some st' -> 'The solution codes will be added soon.\n\n## Some st' (published)
en1	BucketPotato	2022-07-18 19:39:02	3815	Initial revision (saved to drafts)

Rev.

Lang.

When

Comment

en5