Codeforces Round #728

Hello Codeforces!

ijxjdjd and I are pleased to invite you to participate in Codeforces Round 728 (Div. 1) and Codeforces Round 728 (Div. 2) which will be held on Jun/25/2021 18:35 (Moscow time). Please note the unusual timing. Each division will have 5 problems and 2 hours and 15 minutes to solve them.

We would like to thank:

adedalic for amazing coordination of our round!
singleLOOP, skittles1412, penguinhacker, wxhtzdy, coderz189, dorijanlendvaj, qlf9, Nezzar, Tlatoani, MagentaCobra, Etherite, and prabowo for testing the round and providing invaluable feedback.
MikeMirzayanov for the amazing platforms Codeforces and Polygon.
You, for participating!

Read all of the statements carefully, and we hope you enjoy the problems! Wish you high ratings!

UPD: I would also like to thank Roberticey, golions, and 244mhq for testing.

UPD: Here's the score distribution:

Div 1: 500 — 1250 — (1500 + 750) — 3000 — 3500

Div 2: 500 — 1000 — 1500 — 2250 — (2500 + 750)

UPD: The editorial is out!

UPD:

Congratulations to the winners!

Div. 1:

Div. 2:

Rev.	By	When	Δ	Comment
en17	ijxjdjd	2021-06-26 19:02:20	416	Tiny change: 'aroonrk]\n2. [user' -> 'aroonrk]\n\n2. [user'
en16	PurpleCrayon	2021-06-25 21:26:46	77
en15	PurpleCrayon	2021-06-24 23:40:24	201
en14	PurpleCrayon	2021-06-24 22:29:24	203	Tiny change: '\n\nUPD: I would' -> '\n\nUPD: I would'
en13	PurpleCrayon	2021-06-24 06:19:31	35
en12	PurpleCrayon	2021-06-23 18:18:41	0	(published)
en11	PurpleCrayon	2021-06-23 18:18:03	8
en10	PurpleCrayon	2021-06-23 18:17:39	30	Tiny change: '021-06-23] for test' -> '021-06-23], [user:Roberticey] for test' (saved to drafts)
en9	PurpleCrayon	2021-06-23 08:50:32	0	(published)
en8	PurpleCrayon	2021-06-23 07:49:53	4	Tiny change: ' [user:prawobo,2021-06-23] for test' -> ' [user:prabowo] for test'
en7	PurpleCrayon	2021-06-23 07:49:11	11	Tiny change: 'er:prawobo] for test' -> 'er:prawobo,2021-06-23] for test'
en6	PurpleCrayon	2021-06-23 07:48:37	1	Tiny change: 'r:prawobo], for testi' -> 'r:prawobo] for testi'
en5	PurpleCrayon	2021-06-23 07:48:17	0	Tiny change: '-23], and [user:prawobo], for test' -> '-23], and , for test'
en4	PurpleCrayon	2021-06-23 07:47:49	61
en3	PurpleCrayon	2021-06-23 01:02:06	4	Tiny change: 'o thank:\n- [user:' -> 'o thank:\n\n- [user:'
en2	PurpleCrayon	2021-06-23 01:01:15	6
en1	PurpleCrayon	2021-06-23 00:59:39	1071	Initial revision (saved to drafts)