Problemset - Codeforces

Please read the new rule regarding the restriction on the use of AI tools. ×

→ Pay attention

Before contest
Educational Codeforces Round 170 (Rated for Div. 2)
13 days

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
30B	Codeforces World Finals implementation	1700	x1196
30A	Accounting brute force, math	1400	x3451
29E	Quarrel graphs, shortest paths	2400	x900
29D	Ant on the Tree constructive algorithms, dfs and similar, trees	2000	x2449
29C	Mail Stamps data structures, dfs and similar, graphs, implementation	1700	x4892
29B	Traffic Lights implementation	1500	x2950
29A	Spit Problem brute force	1000	x7052
28E	DravDe saves the world geometry, math	2800	x90
28D	Don't fear, DravDe is kind binary search, data structures, dp, hashing	2400	x611
28C	Bath Queue combinatorics, dp, probabilities	2200	x1039
28B	pSort dfs and similar, dsu, graphs	1600	x4628
28A	Bender Problem implementation	1600	x797
27E	Number With The Given Amount Of Divisors brute force, dp, number theory	2000	x4188
27D	Ring Road 2 2-sat, dfs and similar, dsu, graphs	2200	x2507
27C	Unordered Subsequence constructive algorithms, greedy	1900	x2789
27B	Tournament bitmasks, brute force, dfs and similar, greedy	1300	x5343
27A	Next Test implementation, sortings	1200	x20169
26E	Multithreading constructive algorithms	2400	x375
26D	Tickets combinatorics, math, probabilities	2400	x782
26C	Parquet combinatorics, constructive algorithms, greedy, implementation	2000	x856
26B	Regular Bracket Sequence greedy	1400	x19180
26A	Almost Prime number theory	900	x31073
25E	Test hashing, strings	2200	x2442
25D	Roads not only in Berland dsu, graphs, trees	1900	x11263
25C	Roads in Berland graphs, shortest paths	1900	x6241
25B	Phone numbers implementation	1100	x9660
25A	IQ test brute force	1300	x85886
24E	Berland collider binary search	2300	x896
24D	Broken robot dp, math, probabilities	2400	x1934
24C	Sequence of points geometry, implementation, math	1800	x1253
24B	F1 Champions implementation	1500	x1778
24A	Ring road graphs	1400	x5088
23E	Tree dp	2500	x612
23D	Tetragon geometry, math	2600	x336
23C	Oranges and Apples constructive algorithms, sortings	2500	x1413
23B	Party constructive algorithms, graphs, math	1600	x3338
23A	You're Given a String... brute force, greedy	1200	x5318
22E	Scheme dfs and similar, graphs, trees	2300	x1627
22D	Segments greedy, sortings	1900	x2701
22C	System Administrator graphs	1700	x3099
22B	Bargaining Table brute force, dp	1500	x4215
22A	Second Order Statistics brute force	800	x22152
21D	Traveling Graph bitmasks, graph matchings, graphs	2400	x877
21C	Stripe 2 binary search, dp, sortings	2000	x2116
21B	Intersection implementation, math	2000	x1347
21A	Jabber ID implementation, strings	1900	x1851
20C	Dijkstra? graphs, shortest paths	1900	x32589
20B	Equation math	2000	x3864
20A	BerOS file system implementation	1700	x6180
19E	Fairy dfs and similar, divide and conquer, dsu	2900	x1827
19D	Points data structures	2800	x2362
19C	Deletion of Repeats greedy, hashing, string suffix structures	2200	x1091
19B	Checkout Assistant dp	1900	x4744
19A	World Football Cup implementation	1400	x2744
18E	Flag 2 dp	2000	x1081
18D	Seller Bob brute force, dp, greedy	2000	x1070
18C	Stripe data structures, implementation	1200	x13087
18B	Platforms brute force, math	1700	x2129
18A	Triangle brute force, geometry	1500	x6007
17E	Palisection strings	2900	x1581
17D	Notepad number theory	2400	x1080
17C	Balance dp	2500	x921
17B	Hierarchy dfs and similar, dsu, greedy, shortest paths	1500	x4745
17A	Noldbach problem brute force, math, number theory	1000	x16359
16E	Fish bitmasks, dp, probabilities	1900	x5073
16D	Logging implementation, strings	1900	x1577
16C	Monitor binary search, number theory	1800	x4741
16B	Burglar and Matches greedy, implementation, sortings	900	x17915
16A	Flag implementation	800	x14270
15E	Triangles combinatorics, dp	2600	x582
15D	Map data structures, implementation, sortings	2500	x761
15C	Industrial Nim games	2000	x2291
15B	Laser math	1800	x1462
15A	Cottage Village implementation, sortings	1200	x3909
14E	Camels dp	1900	x1700
14D	Two Paths dfs and similar, dp, graphs, shortest paths, trees, two pointers	1900	x4507
14C	Four Segments brute force, constructive algorithms, geometry, implementation, math	1700	x3348
14B	Young Photographer implementation	1000	x7063
14A	Letter implementation	800	x10586
13E	Holes data structures, dsu	2700	x5916
13D	Triangles dp, geometry	2600	x658
13C	Sequence dp, sortings	2200	x4591
13B	Letter A geometry, implementation	2000	x996
13A	Numbers implementation, math	1000	x7768
12E	Start of the session constructive algorithms	2100	x1220
12D	Ball data structures, sortings	2400	x2294
12C	Fruits greedy, implementation, sortings	1100	x6189
12B	Correct Solution? implementation, sortings	1100	x8516
12A	Super Agent implementation	800	x13034
11E	Forward, march! binary search, dp, greedy	2800	x362
11D	A Simple Task bitmasks, dp, graphs	2200	x4845
11C	How Many Squares? implementation	2200	x613
11B	Jumping Jack math	1600	x4678
11A	Increasing Sequence constructive algorithms, implementation, math	900	x13256
10E	Greedy Change constructive algorithms	2600	x832
10D	LCIS dp	2800	x4368
10C	Digital Root number theory	2000	x1445
10B	Cinema Cashier dp, implementation	1500	x1773
10A	Power Consumption Calculation implementation	900	x7161
9E	Interestring graph and Apples dfs and similar, dsu, graphs	2300	x1036