Problemset - Codeforces

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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
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Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
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Problems

#	Name
17D	Notepad number theory	2400	x1326
17C	Balance dp	2500	x1025
17B	Hierarchy dfs and similar, dsu, greedy, shortest paths	1500	x6056
17A	Noldbach problem brute force, math, number theory	1000	x21378
16E	Fish bitmasks, dp, probabilities	1900	x6532
16D	Logging implementation, strings	1900	x1864
16C	Monitor binary search, number theory	1800	x5414
16B	Burglar and Matches greedy, implementation, sortings	900	x20748
16A	Flag implementation	800	x17226
15E	Triangles combinatorics, dp	2600	x673
15D	Map data structures, implementation, sortings	2500	x913
15C	Industrial Nim games	2000	x2837
15B	Laser math	1800	x1680
15A	Cottage Village implementation, sortings	1200	x4494
14E	Camels dp	1900	x2058
14D	Two Paths dfs and similar, dp, graphs, shortest paths, trees, two pointers	1900	x5281
14C	Four Segments brute force, constructive algorithms, geometry, implementation, math	1700	x3857
14B	Young Photographer implementation	1000	x8297
14A	Letter implementation	800	x12386
13E	Holes data structures, dsu	2700	x7936
13D	Triangles dp, geometry	2600	x734
13C	Sequence dp, sortings	2200	x5467
13B	Letter A geometry, implementation	2000	x1123
13A	Numbers implementation, math	1000	x9436
12E	Start of the session constructive algorithms	2100	x1450
12D	Ball data structures, sortings	2400	x2884
12C	Fruits greedy, implementation, sortings	1100	x7350
12B	Correct Solution? implementation, sortings	1100	x9665
12A	Super Agent implementation	800	x15417
11E	Forward, march! binary search, dp, greedy	2800	x439
11D	A Simple Task bitmasks, dp, graphs	2200	x6378
11C	How Many Squares? implementation	2200	x691
11B	Jumping Jack math	1600	x5703
11A	Increasing Sequence constructive algorithms, implementation, math	900	x15485
10E	Greedy Change constructive algorithms	2600	x924
10D	LCIS dp	2800	x5623
10C	Digital Root number theory	2000	x1698
10B	Cinema Cashier dp, implementation	1500	x2052
10A	Power Consumption Calculation implementation	900	x8341
9E	Interestring graph and Apples dfs and similar, dsu, graphs	2300	x1162
9D	How many trees? combinatorics, divide and conquer, dp	1900	x4499
9C	Hexadecimal's Numbers brute force, implementation, math	1200	x14344
9B	Running Student brute force, geometry, implementation	1200	x6184
9A	Die Roll math, probabilities	800	x69611
8E	Beads dp, graphs	2600	x758
8D	Two Friends binary search, geometry	2600	x580
8C	Looking for Order bitmasks, dp	2000	x4211
8B	Obsession with Robots constructive algorithms, graphs, implementation	1400	x4964
8A	Train and Peter strings	1200	x6725
7E	Defining Macros dp, expression parsing, implementation	2600	x777
7D	Palindrome Degree hashing, strings	2200	x4466
7C	Line math, number theory	1800	x5473
7B	Memory Manager implementation	1600	x2954
7A	Kalevitch and Chess brute force, constructive algorithms	1100	x8020
6E	Exposition binary search, data structures, dsu, trees, two pointers	1900	x3863
6D	Lizards and Basements 2 brute force, dp	2600	x2279
6C	Alice, Bob and Chocolate greedy, two pointers	1200	x17448
6B	President's Office implementation	1100	x14816
6A	Triangle brute force, geometry	900	x22829
5E	Bindian Signalizing data structures	2400	x2486
5D	Follow Traffic Rules implementation, math	2100	x1935
5C	Longest Regular Bracket Sequence constructive algorithms, data structures, dp, greedy, sortings, strings	1900	x18049
5B	Center Alignment implementation, strings	1200	x6760
5A	Chat Servers Outgoing Traffic implementation	1000	x11096
4D	Mysterious Present dp, sortings	1700	x12096
4C	Registration System data structures, hashing, implementation	1300	x107790
4B	Before an Exam constructive algorithms, greedy	1200	x29440
4A	Watermelon brute force, math	800	x686617
3D	Least Cost Bracket Sequence greedy	2600	x3938
3C	Tic-tac-toe brute force, games, implementation	1800	x8266
3B	Lorry greedy, sortings	1900	x5221
3A	Shortest path of the king greedy, shortest paths	1000	x22113
2C	Commentator problem geometry	2600	x2018
2B	The least round way dp, math	2000	x12930
2A	Winner hashing, implementation	1500	x31188
1C	Ancient Berland Circus geometry, math	2100	x6473
1B	Spreadsheet implementation, math	1600	x26285
1A	Theatre Square math	1000	x319872

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