Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round 945 (Div. 2)
2 days
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

number theory

Add tag

Problems

#	Name
1780B	GCD Partition brute force, greedy, math, number theory	1100	x16597
1778F	Maximizing Root dfs and similar, dp, graphs, math, number theory, trees	2600	x599
1777C	Quiz Master binary search, math, number theory, sortings, two pointers	1700	x7844
1775D	Friendly Spiders dfs and similar, graphs, math, number theory, shortest paths	1800	x5782
1771C	Hossam and Trainees greedy, math, number theory	1600	x9037
1770F	Koxia and Sequence bitmasks, combinatorics, dp, math, number theory	3100	x618
1770C	Koxia and Number Theory brute force, chinese remainder theorem, math, number theory	1700	x8282
1768E	Partial Sorting combinatorics, math, number theory	2300	x1786
1768A	Greatest Convex greedy, math, number theory	800	x28029
1766D	Lucky Chains math, number theory	1600	x8397
1765M	Minimum LCM math, number theory	1000	x12723
1764B	Doremy's Perfect Math Class math, number theory	900	x15275
1763E	Node Pairs dp, graphs, math, number theory	2200	x1701
1763D	Valid Bitonic Permutations combinatorics, dp, implementation, math, number theory	2200	x1962
1762D	GCD Queries constructive algorithms, interactive, number theory	2100	x3293
1762B	Make Array Good constructive algorithms, implementation, number theory, sortings	1100	x16201
1762A	Divide and Conquer greedy, math, number theory	800	x18573
1759F	All Possible Digits binary search, data structures, greedy, math, number theory	1800	x3711
1759D	Make It Round brute force, number theory	1400	x12279
1758C	Almost All Multiples greedy, number theory	1400	x12927
1753B	Factorial Divisibility math, number theory	1600	x12067
1750D	Count GCD combinatorics, math, number theory	1800	x5573
1749D	Counting Arrays combinatorics, dp, math, number theory	1900	x5269
1748D	ConstructOR bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory	2100	x2667
1744E2	Divisible Numbers (hard version) brute force, math, number theory	1900	x5284
1744E1	Divisible Numbers (easy version) brute force, math, number theory	1500	x10252
1742D	Coprime brute force, greedy, number theory	1100	x21748
1740I	Arranging Crystal Balls data structures, divide and conquer, divide and conquer, dp, geometry, graphs, number theory	3500	x104
1740A	Factorise N+M constructive algorithms, number theory	800	x19621
1737F	Ela and Prime GCD constructive algorithms, math, number theory	3300	x117
1736B	Playing with GCD math, number theory	1200	x17284
1734E	Rectangular Congruence constructive algorithms, number theory	2100	x2766
1732E	Location data structures, dp, math, number theory	2800	x414
1732D2	Balance (Hard version) brute force, data structures, number theory	2400	x1365
1732D1	Balance (Easy version) brute force, data structures, implementation, number theory	1500	x8282
1732A	Bestie brute force, combinatorics, constructive algorithms, implementation, math, number theory	1000	x14431
1731E	Graph Cost dp, greedy, math, number theory	2000	x2665
1731C	Even Subarrays bitmasks, brute force, hashing, math, number theory	1700	x8966
1730E	Maximums and Minimums combinatorics, data structures, divide and conquer, number theory	2700	x615
1728E	Red-Black Pepper brute force, data structures, greedy, math, number theory	2300	x1651
1725E	Electrical Efficiency combinatorics, data structures, dp, math, number theory, trees	2500	x432
1720A	Burenka Plays with Fractions math, number theory	900	x21768
1718F	Burenka, an Array and Queries data structures, math, number theory	3300	x145
1718C	Tonya and Burenka-179 data structures, greedy, math, number theory	2400	x1521
1718B	Fibonacci Strings greedy, implementation, math, number theory	2000	x2887
1717E	Madoka and The Best University math, number theory	2200	x2480
1717A	Madoka and Strange Thoughts math, number theory	800	x19160
1716F	Bags with Balls combinatorics, dp, math, number theory	2500	x1000
1714E	Add Modulo 10 brute force, math, number theory	1400	x15311
1713D	Tournament Countdown constructive algorithms, greedy, interactive, number theory, probabilities	1800	x5467
1712E2	LCM Sum (hard version) brute force, data structures, math, number theory, two pointers	2500	x1183
1712E1	LCM Sum (easy version) binary search, brute force, combinatorics, math, number theory, two pointers	2300	x2042
1712B	Woeful Permutation constructive algorithms, greedy, number theory	800	x21261
1707F	Bugaboo bitmasks, constructive algorithms, dp, number theory	3500	x144
1706D2	Chopping Carrots (Hard Version) brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers	2400	x1653
1706D1	Chopping Carrots (Easy Version) binary search, brute force, constructive algorithms, greedy, number theory	1700	x6678
1702F	Equate Multisets constructive algorithms, data structures, greedy, math, number theory	1700	x7955
1699E	Three Days Grace data structures, dp, greedy, math, number theory, two pointers	2600	x1087
1698G	Long Binary String bitmasks, math, matrices, meet-in-the-middle, number theory	2900	x301
1690F	Shifting String graphs, math, number theory, strings	1700	x6820
1687E	Become Big For Me combinatorics, constructive algorithms, greedy, math, number theory	3500	x215
1684G	Euclid Guess constructive algorithms, flows, graph matchings, math, number theory	2800	x579
1679A	AvtoBus brute force, greedy, math, number theory	900	x21948
1673E	Power or XOR? bitmasks, combinatorics, math, number theory	2500	x661
1673D	Lost Arithmetic Progression combinatorics, math, number theory	1900	x3197
1673C	Palindrome Basis brute force, dp, math, number theory	1500	x11745
1665D	GCD Guess bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory	2000	x3703
1658E	Gojou and Matrix Game data structures, dp, games, hashing, implementation, math, number theory, sortings	2500	x1022
1658B	Marin and Anti-coprime Permutation combinatorics, math, number theory	800	x18372
1656H	Equal LCM Subsets data structures, math, number theory	3200	x415
1656D	K-good constructive algorithms, math, number theory	1900	x6623
1656C	Make Equal With Mod constructive algorithms, math, number theory, sortings	1200	x18515
1654D	Potion Brewing Class dfs and similar, math, number theory, trees	2100	x2781
1647D	Madoka and the Best School in Russia constructive algorithms, dp, math, number theory	1900	x5119
1646E	Power Board brute force, dp, math, number theory	2200	x2301
1644F	Basis combinatorics, fft, math, number theory	2900	x313
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x6005
1632D	New Year Concert binary search, data structures, greedy, math, number theory, two pointers	2000	x4469
1630F	Making It Bipartite flows, graph matchings, graphs, number theory	3400	x508
1630E	Expected Components combinatorics, math, number theory, probabilities	2900	x423
1630D	Flipping Range constructive algorithms, dp, greedy, number theory	2400	x1509
1629B	GCD Arrays greedy, math, number theory	800	x22982
1627D	Not Adding brute force, dp, math, number theory	1900	x7846
1627C	Not Assigning constructive algorithms, dfs and similar, number theory, trees	1400	x14059
1626F	A Random Code Problem combinatorics, dp, math, number theory, probabilities	2800	x707
1622F	Quadratic Set constructive algorithms, hashing, math, number theory	2900	x595
1617E	Christmas Chocolates dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees	2700	x834
1617B	GCD Problem brute force, constructive algorithms, math, number theory	900	x22438
1614D2	Divan and Kostomuksha (hard version) dp, number theory	2300	x2180
1614D1	Divan and Kostomuksha (easy version) dp, number theory	2100	x3654
1612D	X-Magic Pair math, number theory	1600	x8842
1610D	Not Quite Lee combinatorics, dp, math, number theory	2000	x2581
1609C	Complex Market Analysis binary search, dp, implementation, number theory, schedules, two pointers	1400	x9493
1609A	Divide and Multiply greedy, implementation, math, number theory	900	x16683
1608D	Dominoes combinatorics, fft, graphs, math, number theory	2400	x1348
1606C	Banknotes greedy, number theory	1400	x13760
1605E	Array Equalizer binary search, greedy, implementation, math, number theory, sortings, two pointers	2400	x997
1605A	A.M. Deviation math, number theory	800	x20340
1603D	Artistic Partition divide and conquer, dp, number theory	3000	x610
1603C	Extreme Extension dp, greedy, math, number theory	2300	x1977