Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
35:27:21
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

math

Add tag

Problems

#	Name
1493E	Enormous XOR bitmasks, constructive algorithms, greedy, math, strings, two pointers	2600	x858
1400G	Mercenaries bitmasks, brute force, combinatorics, dp, dsu, math, two pointers	2600	x886
914G	Sum the Fibonacci bitmasks, divide and conquer, dp, fft, math	2600	x891
1536F	Omkar and Akmar chinese remainder theorem, combinatorics, constructive algorithms, fft, games, geometry, math, meet-in-the-middle, string suffix structures	2600	x909
1111D	Destroy the Colony combinatorics, dp, math	2600	x915
1835C	Twin Clusters bitmasks, brute force, constructive algorithms, math, probabilities	2600	x924
285E	Positions in Permutations combinatorics, dp, math	2600	x926
1656F	Parametric MST binary search, constructive algorithms, graphs, greedy, math, sortings	2600	x981
1863F	Divide, XOR, and Conquer bitmasks, dp, math	2600	x989
724G	Xor-matic Number of the Graph bitmasks, graphs, math, number theory, trees	2600	x990
917D	Stranger Trees dp, math, matrices, trees	2600	x996
1815D	XOR Counting bitmasks, combinatorics, dp, math	2600	x1022
1699E	Three Days Grace data structures, dp, greedy, math, number theory, two pointers	2600	x1071
1270F	Awesome Substrings math, strings	2600	x1086
1437F	Emotional Fishermen combinatorics, dp, math, two pointers	2600	x1159
1554E	You dfs and similar, dp, math, number theory	2600	x1174
1495D	BFS Trees combinatorics, dfs and similar, graphs, math, shortest paths, trees	2600	x1187
258D	Little Elephant and Broken Sorting dp, math, probabilities	2600	x1204
1523E	Crypto Lights combinatorics, dp, math, probabilities	2600	x1521
1406E	Deleting Numbers interactive, math, number theory	2600	x1536
1344C	Quantifier Question dfs and similar, dp, graphs, math	2600	x1637
1278F	Cards combinatorics, dp, math, number theory, probabilities	2600	x1707
1375F	Integer Game constructive algorithms, games, interactive, math	2600	x1923
662C	Binary Table bitmasks, brute force, divide and conquer, dp, fft, math	2600	x1935
622F	The Sum of the k-th Powers math	2600	x3435
1211G	King's Path *special problem, math, trees	2500	x66
401E	Olympic Games math	2500	x166
1906K	Deck-Building Game divide and conquer, math	2500	x259
220D	Little Elephant and Triangle geometry, math	2500	x271
57D	Journey dp, math	2500	x327
117D	Not Quick Transformation divide and conquer, math	2500	x329
93D	Flags dp, math, matrices	2500	x331
883D	Packmen Strike Back binary search, dp, math	2500	x348
852A	Digits brute force, implementation, math	2500	x364
60D	Savior brute force, dsu, math	2500	x393
747F	Igor and Interesting Numbers brute force, combinatorics, dp, math	2500	x408
380D	Sereja and Cinema combinatorics, math	2500	x408
95D	Horse Races dp, math	2500	x412
832C	Strange Radiation binary search, implementation, math	2500	x426
1725E	Electrical Efficiency combinatorics, data structures, dp, math, number theory, trees	2500	x430
68D	Half-decay tree data structures, divide and conquer, dp, math, probabilities	2500	x445
1056F	Write The Contest binary search, dp, math	2500	x461
1798F	Gifts from Grandfather Ahmed dp, math, number theory	2500	x463
1468I	Plane Tiling geometry, implementation, math	2500	x468
1834F	Typewriter brute force, math	2500	x482
989D	A Shade of Moonlight binary search, geometry, math, sortings, two pointers	2500	x502
1709F	Multiset of Strings bitmasks, brute force, dp, fft, flows, graphs, math, meet-in-the-middle, trees	2500	x523
1186E	Vus the Cossack and a Field divide and conquer, implementation, math	2500	x554
712E	Memory and Casinos data structures, math, probabilities	2500	x598
1787F	Inverse Transformation constructive algorithms, implementation, math	2500	x624
1731F	Function Sum brute force, combinatorics, dp, fft, math	2500	x652
1673E	Power or XOR? bitmasks, combinatorics, math, number theory	2500	x657
1666E	Even Split binary search, constructive algorithms, greedy, math	2500	x669
1195F	Geometers Anonymous Club data structures, geometry, math, sortings	2500	x691
266E	More Queries to Array... data structures, math	2500	x715
1775F	Laboratory on Pluto constructive algorithms, dp, greedy, math	2500	x729
908E	New Year and Entity Enumeration bitmasks, combinatorics, dp, math	2500	x732
995D	Game math	2500	x743
1789E	Serval and Music Game brute force, dp, implementation, math, number theory	2500	x754
645F	Cowslip Collections combinatorics, math, number theory	2500	x756
1734F	Zeros and Ones bitmasks, divide and conquer, dp, math	2500	x764
1891E	Brukhovich and Exams brute force, greedy, implementation, math, sortings	2500	x767
1017F	The Neutral Zone brute force, math	2500	x794
1516E	Baby Ehab Plays with Permutations combinatorics, dp, math	2500	x808
1778E	The Tree Has Fallen! bitmasks, dfs and similar, math, trees	2500	x809
1909F2	Small Permutation Problem (Hard Version) combinatorics, dp, math	2500	x811
1814D	Balancing Weapons binary search, brute force, data structures, math, two pointers	2500	x814
1767E	Algebra Flash bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees	2500	x823
1187F	Expected Square Beauty dp, math, probabilities	2500	x833
1806D	DSU Master combinatorics, dp, dsu, math	2500	x835
1498F	Christmas Game bitmasks, data structures, dfs and similar, dp, games, math, trees	2500	x837
1847F	The Boss's Identity binary search, bitmasks, data structures, dfs and similar, greedy, math, sortings	2500	x845
555D	Case of a Top Secret binary search, implementation, math	2500	x856
1574E	Coloring combinatorics, constructive algorithms, implementation, math	2500	x857
1096E	The Top Scorer combinatorics, dp, math, probabilities	2500	x857
1701F	Points combinatorics, data structures, implementation, math, matrices	2500	x879
1737E	Ela Goes Hiking combinatorics, dp, math, probabilities	2500	x883
1840G2	In Search of Truth (Hard Version) constructive algorithms, interactive, math, meet-in-the-middle, probabilities	2500	x886
1835B	Lottery binary search, brute force, greedy, math, two pointers	2500	x888
1691F	K-Set Tree combinatorics, dfs and similar, dp, math, trees	2500	x900
1661E	Narrow Components brute force, data structures, dp, dsu, math, trees	2500	x908
1037F	Maximum Reduction combinatorics, data structures, math	2500	x928
1956E1	Nene vs. Monsters (Easy Version) brute force, implementation, math	2500	x945
407C	Curious Array brute force, combinatorics, implementation, math	2500	x949
613C	Necklace constructive algorithms, math	2500	x971
1716F	Bags with Balls combinatorics, dp, math, number theory	2500	x988
1658E	Gojou and Matrix Game data structures, dp, games, hashing, implementation, math, number theory, sortings	2500	x1000
792E	Colored Balls greedy, math, number theory	2500	x1032
1948F	Rare Coins combinatorics, math, probabilities	2500	x1042
1307E	Cow and Treats binary search, combinatorics, dp, greedy, implementation, math	2500	x1073
1284E	New Year and Castle Construction combinatorics, geometry, math, sortings	2500	x1093
710D	Two Arithmetic Progressions math, number theory	2500	x1150
1556F	Sports Betting bitmasks, combinatorics, dp, graphs, math, probabilities	2500	x1157
1712E2	LCM Sum (hard version) brute force, data structures, math, number theory, two pointers	2500	x1176
1823E	Removing Graph brute force, dp, games, graphs, math	2500	x1185
1677D	Tokitsukaze and Permutations dp, math	2500	x1186
1917E	Construct Matrix constructive algorithms, math	2500	x1251
1845E	Boxes and Balls dp, implementation, math	2500	x1253
1427E	Xum bitmasks, constructive algorithms, math, matrices, number theory	2500	x1256
1710C	XOR Triangle bitmasks, brute force, constructive algorithms, dp, greedy, math	2500	x1265