Problemset - Codeforces

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Educational Codeforces Round 166 (Rated for Div. 2)
2 days
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Difficulty: —

number theory

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Problems

#	Name
1780F	Three Chairs bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings	2300	x1389
1780E	Josuke and Complete Graph binary search, brute force, data structures, math, number theory	2400	x1315
1780B	GCD Partition brute force, greedy, math, number theory	1100	x16726
1778F	Maximizing Root dfs and similar, dp, graphs, math, number theory, trees	2600	x600
1777C	Quiz Master binary search, math, number theory, sortings, two pointers	1700	x7893
1775D	Friendly Spiders dfs and similar, graphs, math, number theory, shortest paths	1800	x5824
1771C	Hossam and Trainees greedy, math, number theory	1600	x9105
1770F	Koxia and Sequence bitmasks, combinatorics, dp, math, number theory	3100	x621
1770C	Koxia and Number Theory brute force, chinese remainder theorem, math, number theory	1700	x8307
1768E	Partial Sorting combinatorics, math, number theory	2300	x1793
1768A	Greatest Convex greedy, math, number theory	800	x28108
1766D	Lucky Chains math, number theory	1600	x8475
1765M	Minimum LCM math, number theory	1000	x12952
1764B	Doremy's Perfect Math Class math, number theory	900	x15325
1763E	Node Pairs dp, graphs, math, number theory	2200	x1706
1763D	Valid Bitonic Permutations combinatorics, dp, implementation, math, number theory	2200	x1968
1762D	GCD Queries constructive algorithms, interactive, number theory	2100	x3310
1762B	Make Array Good constructive algorithms, implementation, number theory, sortings	1100	x16278
1762A	Divide and Conquer greedy, math, number theory	800	x18619
1759F	All Possible Digits binary search, data structures, greedy, math, number theory	1800	x3733
1759D	Make It Round brute force, number theory	1400	x12400
1758C	Almost All Multiples greedy, number theory	1400	x13003
1753B	Factorial Divisibility math, number theory	1600	x12134
1750D	Count GCD combinatorics, math, number theory	1800	x5611
1749D	Counting Arrays combinatorics, dp, math, number theory	1900	x5314
1748D	ConstructOR bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory	2100	x2674
1744E2	Divisible Numbers (hard version) brute force, math, number theory	1900	x5312
1744E1	Divisible Numbers (easy version) brute force, math, number theory	1500	x10299
1742D	Coprime brute force, greedy, number theory	1100	x21938
1740I	Arranging Crystal Balls data structures, divide and conquer, divide and conquer, dp, geometry, graphs, number theory	3500	x105
1740A	Factorise N+M constructive algorithms, number theory	800	x19679
1737F	Ela and Prime GCD constructive algorithms, math, number theory	3300	x118
1736B	Playing with GCD math, number theory	1200	x17335
1734E	Rectangular Congruence constructive algorithms, number theory	2100	x2805
1732E	Location data structures, dp, math, number theory	2800	x414
1732D2	Balance (Hard version) brute force, data structures, number theory	2400	x1370
1732D1	Balance (Easy version) brute force, data structures, implementation, number theory	1500	x8320
1732A	Bestie brute force, combinatorics, constructive algorithms, implementation, math, number theory	1000	x14480
1731E	Graph Cost dp, greedy, math, number theory	2000	x2682
1731C	Even Subarrays bitmasks, brute force, hashing, math, number theory	1700	x9035
1730E	Maximums and Minimums combinatorics, data structures, divide and conquer, number theory	2700	x616
1728E	Red-Black Pepper brute force, data structures, greedy, math, number theory	2300	x1660
1725E	Electrical Efficiency combinatorics, data structures, dp, math, number theory, trees	2500	x436
1720A	Burenka Plays with Fractions math, number theory	900	x21832
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	x1526
1718B	Fibonacci Strings greedy, implementation, math, number theory	2000	x2895
1717E	Madoka and The Best University math, number theory	2200	x2502
1717A	Madoka and Strange Thoughts math, number theory	800	x19187
1716F	Bags with Balls combinatorics, dp, math, number theory	2500	x1004
1714E	Add Modulo 10 brute force, math, number theory	1400	x15440
1713D	Tournament Countdown constructive algorithms, greedy, interactive, number theory, probabilities	1800	x5490
1712E2	LCM Sum (hard version) brute force, data structures, math, number theory, two pointers	2500	x1184
1712E1	LCM Sum (easy version) binary search, brute force, combinatorics, math, number theory, two pointers	2300	x2051
1712B	Woeful Permutation constructive algorithms, greedy, number theory	800	x21289
1707F	Bugaboo bitmasks, constructive algorithms, dp, number theory	3500	x145
1706D2	Chopping Carrots (Hard Version) brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers	2400	x1657
1706D1	Chopping Carrots (Easy Version) binary search, brute force, constructive algorithms, greedy, number theory	1700	x6706
1702F	Equate Multisets constructive algorithms, data structures, greedy, math, number theory	1700	x7997
1699E	Three Days Grace data structures, dp, greedy, math, number theory, two pointers	2600	x1094
1698G	Long Binary String bitmasks, math, matrices, meet-in-the-middle, number theory	2900	x301
1690F	Shifting String graphs, math, number theory, strings	1700	x6858
1687E	Become Big For Me combinatorics, constructive algorithms, greedy, math, number theory	3500	x217
1684G	Euclid Guess constructive algorithms, flows, graph matchings, math, number theory	2800	x580
1679A	AvtoBus brute force, greedy, math, number theory	900	x22137
1673E	Power or XOR? bitmasks, combinatorics, math, number theory	2500	x663
1673D	Lost Arithmetic Progression combinatorics, math, number theory	1900	x3207
1673C	Palindrome Basis brute force, dp, math, number theory	1500	x11949
1665D	GCD Guess bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory	2000	x3727
1658E	Gojou and Matrix Game data structures, dp, games, hashing, implementation, math, number theory, sortings	2500	x1024
1658B	Marin and Anti-coprime Permutation combinatorics, math, number theory	800	x18393
1656H	Equal LCM Subsets data structures, math, number theory	3200	x418
1656D	K-good constructive algorithms, math, number theory	1900	x6662
1656C	Make Equal With Mod constructive algorithms, math, number theory, sortings	1200	x18598
1654D	Potion Brewing Class dfs and similar, math, number theory, trees	2100	x2790
1647D	Madoka and the Best School in Russia constructive algorithms, dp, math, number theory	1900	x5136
1646E	Power Board brute force, dp, math, number theory	2200	x2307
1644F	Basis combinatorics, fft, math, number theory	2900	x315
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x6032
1632D	New Year Concert binary search, data structures, greedy, math, number theory, two pointers	2000	x4494
1630F	Making It Bipartite flows, graph matchings, graphs, number theory	3400	x518
1630E	Expected Components combinatorics, math, number theory, probabilities	2900	x424
1630D	Flipping Range constructive algorithms, dp, greedy, number theory	2400	x1514
1629B	GCD Arrays greedy, math, number theory	800	x23024
1627D	Not Adding brute force, dp, math, number theory	1900	x7877
1627C	Not Assigning constructive algorithms, dfs and similar, number theory, trees	1400	x14095
1626F	A Random Code Problem combinatorics, dp, math, number theory, probabilities	2800	x711
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	x836
1617B	GCD Problem brute force, constructive algorithms, math, number theory	900	x22526
1614D2	Divan and Kostomuksha (hard version) dp, number theory	2300	x2191
1614D1	Divan and Kostomuksha (easy version) dp, number theory	2100	x3665
1612D	X-Magic Pair math, number theory	1600	x8862
1610D	Not Quite Lee combinatorics, dp, math, number theory	2000	x2593
1609C	Complex Market Analysis binary search, dp, implementation, number theory, schedules, two pointers	1400	x9527
1609A	Divide and Multiply greedy, implementation, math, number theory	900	x16721
1608D	Dominoes combinatorics, fft, graphs, math, number theory	2400	x1354
1606C	Banknotes greedy, number theory	1400	x13801
1605E	Array Equalizer binary search, greedy, implementation, math, number theory, sortings, two pointers	2400	x1000
1605A	A.M. Deviation math, number theory	800	x20369