Problemset - Codeforces

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

→ Pay attention

Before contest
Codeforces Round (Div. 2)
4 days
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
1704H2	Game of AI (hard version) combinatorics, fft, math	3500	x85
1704H1	Game of AI (easy version) combinatorics, constructive algorithms, dp, fft, math	3200	x180
1704G	Mio and Lucky Array constructive algorithms, fft, math, strings	3500	x113
1704F	Colouring Game constructive algorithms, dp, games	2600	x1038
1704E	Count Seconds brute force, constructive algorithms, dp, graphs, implementation, math	2200	x2344
1704D	Magical Array constructive algorithms, hashing, implementation, math	1900	x5018
1704C	Virus greedy, implementation, sortings	1200	x15760
1704B	Luke is a Foodie brute force, greedy, implementation	1000	x18005
1704A	Two 0-1 Sequences constructive algorithms, greedy	800	x16015
1703G	Good Key, Bad Key bitmasks, brute force, dp, greedy, math	1600	x10641
1703F	Yet Another Problem About Pairs Satisfying an Inequality binary search, data structures, dp, greedy, sortings	1300	x19975
1703E	Mirror Grid implementation	1200	x18313
1703D	Double Strings brute force, data structures, strings	1100	x25597
1703C	Cypher brute force, implementation, strings	800	x35489
1703B	ICPC Balloons data structures, implementation	800	x48892
1703A	YES or YES? brute force, implementation, strings	800	x69142
1702G2	Passable Paths (hard version) data structures, dfs and similar, trees	2000	x4641
1702G1	Passable Paths (easy version) dfs and similar, trees	1900	x5429
1702F	Equate Multisets constructive algorithms, data structures, greedy, math, number theory	1700	x8369
1702E	Split Into Two Sets dfs and similar, dsu, graphs	1600	x13278
1702D	Not a Cheap String greedy	1000	x23663
1702C	Train and Queries data structures, greedy	1100	x22221
1702B	Polycarp Writes a String from Memory greedy	800	x27573
1702A	Round Down the Price constructive algorithms	800	x34745
1701F	Points combinatorics, data structures, implementation, math, matrices	2500	x924
1701E	Text Editor brute force, dp, greedy, strings	2500	x1123
1701D	Permutation Restoration binary search, data structures, greedy, math, sortings, two pointers	1900	x5677
1701C	Schedule Management binary search, greedy, implementation, two pointers	1400	x16986
1701B	Permutation greedy	800	x20191
1701A	Grass Field implementation	800	x26248
1700F	Puzzle constructive algorithms, dp, greedy	2600	x934
1700E	Serega the Pirate brute force, constructive algorithms	2600	x851
1700D	River Locks binary search, dp, greedy, math	1900	x6086
1700C	Helping the Nature constructive algorithms, data structures, greedy	1700	x10906
1700B	Palindromic Numbers constructive algorithms, implementation, math	1100	x18705
1700A	Optimal Path constructive algorithms, greedy, math	800	x22858
1699E	Three Days Grace data structures, dp, greedy, math, number theory, two pointers	2600	x1142
1699D	Almost Triple Deletions data structures, dp, greedy	2300	x3142
1699C	The Third Problem combinatorics, constructive algorithms, math	1700	x9755
1699B	Almost Ternary Matrix bitmasks, constructive algorithms, matrices	900	x19704
1699A	The Third Three Number Problem constructive algorithms, math	800	x23991
1698G	Long Binary String bitmasks, math, matrices, meet-in-the-middle, number theory	2900	x315
1698F	Equal Reversal constructive algorithms, graphs, implementation, math	2800	x623
1698E	PermutationForces II brute force, combinatorics, greedy, sortings, trees, two pointers	2300	x1639
1698D	Fixed Point Guessing binary search, constructive algorithms, interactive	1600	x9287
1698C	3SUM Closure brute force, data structures	1300	x18488
1698B	Rising Sand constructive algorithms, greedy, implementation	800	x20904
1698A	XOR Mixup bitmasks, brute force	800	x29003
1697F	Too Many Constraints 2-sat, constructive algorithms, graphs, implementation	2800	x560
1697E	Coloring brute force, combinatorics, constructive algorithms, dp, geometry, graphs, greedy, implementation, math	2400	x1197
1697D	Guess The String binary search, constructive algorithms, interactive	1900	x4433
1697C	awoo's Favorite Problem binary search, constructive algorithms, data structures, greedy, implementation, strings, two pointers	1400	x14347
1697B	Promo greedy, sortings	900	x26541
1697A	Parkway Walk greedy, implementation	800	x25721
1696H	Maximum Product? brute force, combinatorics, dp, greedy, implementation, math, two pointers	3500	x161
1696G	Fishingprince Plays With Array Again brute force, data structures, geometry, math	3300	x276
1696F	Tree Recovery brute force, constructive algorithms, dfs and similar, dsu, graphs, trees	2600	x882
1696E	Placing Jinas combinatorics, math	2000	x4038
1696D	Permutation Graph binary search, constructive algorithms, data structures, divide and conquer, greedy, shortest paths	1900	x5451
1696C	Fishingprince Plays With Array constructive algorithms, greedy, implementation, math	1400	x11618
1696B	NIT Destroys the Universe greedy	900	x21277
1696A	NIT orz! bitmasks, greedy	800	x18763
1695E	Ambiguous Dominoes constructive algorithms, dfs and similar, graphs	2700	x448
1695D2	Tree Queries (Hard Version) constructive algorithms, dfs and similar, dp, greedy, trees	2300	x1997
1695D1	Tree Queries (Easy Version) brute force, constructive algorithms, dfs and similar, dp, greedy, trees	2200	x2175
1695C	Zero Path brute force, data structures, dp, graphs, greedy, shortest paths	1700	x10920
1695B	Circle Game games, greedy	1000	x18450
1695A	Subrectangle Guess games	800	x16333
1694B	Paranoid String constructive algorithms, greedy	1200	x19113
1694A	Creep greedy, implementation	800	x22649
1693F	I Might Be Wrong binary search, greedy, two pointers	3400	x405
1693E	Outermost Maximums data structures, greedy	3400	x422
1693D	Decinc Dividing brute force, data structures, divide and conquer, dp, greedy	2800	x839
1693C	Keshi in Search of AmShZ graphs, greedy, shortest paths	2300	x2579
1693B	Fake Plastic Trees dfs and similar, dp, greedy, trees	1700	x8458
1693A	Directional Increase greedy	1300	x16131
1692H	Gambling data structures, dp, greedy, math	1700	x7455
1692G	2^Sort data structures, dp, sortings, two pointers	1400	x17683
1692F	3SUM brute force, math	1300	x22751
1692E	Binary Deque binary search, implementation, two pointers	1200	x21907
1692D	The Clock brute force, implementation	1100	x19404
1692C	Where's the Bishop? implementation	800	x34093
1692B	All Distinct greedy, sortings	800	x34115
1692A	Marathon implementation	800	x64857
1691F	K-Set Tree combinatorics, dfs and similar, dp, math, trees	2500	x972
1691E	Number of Groups data structures, dfs and similar, dsu, graphs, greedy, sortings	2300	x1829
1691D	Max GEQ Sum binary search, constructive algorithms, data structures, divide and conquer, implementation, two pointers	1800	x5789
1691C	Sum of Substrings brute force, constructive algorithms, greedy, math, strings	1400	x15637
1691B	Shoe Shuffling constructive algorithms, greedy, implementation, two pointers	1000	x23028
1691A	Beat The Odds brute force, greedy, math	800	x30513
1690G	Count the Trains binary search, data structures, greedy, sortings	2000	x3385
1690F	Shifting String graphs, math, number theory, strings	1700	x7156
1690E	Price Maximization binary search, greedy, math, two pointers	1500	x15173
1690D	Black and White Stripe implementation, two pointers	1000	x29520
1690C	Restoring the Duration of Tasks data structures, greedy, implementation	800	x26099
1690B	Array Decrements greedy, implementation	800	x25299
1690A	Print a Pedestal (Codeforces logo?) constructive algorithms, greedy	800	x33456
1689E	ANDfinity bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs	2500	x1210
1689D	Lena and Matrix data structures, dp, geometry, shortest paths	1900	x4209
1689C	Infected Tree dfs and similar, dp, trees	1600	x11216