Problemset - Codeforces

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Codeforces Round (Div. 2)
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number theory

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Problems

#	Name
1798C	Candy Store greedy, math, number theory	1700	x7942
1797E	Li Hua and Array brute force, data structures, dsu, math, number theory, two pointers	2300	x1218
1796F	Strange Triples brute force, math, number theory	2900	x170
1794D	Counting Factorizations combinatorics, divide and conquer, dp, math, number theory	1900	x3438
1792E	Divisors and Table brute force, dfs and similar, dp, number theory	2400	x1330
1789E	Serval and Music Game brute force, dp, implementation, math, number theory	2500	x778
1789A	Serval and Mocha's Array brute force, math, number theory	800	x17668
1787B	Number Factorization greedy, math, number theory	1100	x12906
1783E	Game of the Year brute force, data structures, math, number theory	2300	x2052
1781D	Many Perfect Squares brute force, math, number theory	1800	x5355
1780G	Delicious Dessert binary search, dsu, hashing, math, number theory, string suffix structures	2400	x679
1780F	Three Chairs bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings	2300	x1410
1780E	Josuke and Complete Graph binary search, brute force, data structures, math, number theory	2400	x1331
1780B	GCD Partition brute force, greedy, math, number theory	1100	x17146
1778F	Maximizing Root dfs and similar, dp, graphs, math, number theory, trees	2600	x610
1777C	Quiz Master binary search, math, number theory, sortings, two pointers	1700	x8072
1775D	Friendly Spiders dfs and similar, graphs, math, number theory, shortest paths	1800	x5961
1771C	Hossam and Trainees greedy, math, number theory	1600	x9306
1770F	Koxia and Sequence bitmasks, combinatorics, dp, math, number theory	3100	x631
1770C	Koxia and Number Theory brute force, chinese remainder theorem, math, number theory	1700	x8389
1768E	Partial Sorting combinatorics, math, number theory	2300	x1807
1768A	Greatest Convex greedy, math, number theory	800	x28322
1766D	Lucky Chains math, number theory	1600	x8626
1765M	Minimum LCM math, number theory	1000	x13661
1764B	Doremy's Perfect Math Class math, number theory	900	x15601
1763E	Node Pairs dp, graphs, math, number theory	2200	x1734
1763D	Valid Bitonic Permutations combinatorics, dp, implementation, math, number theory	2200	x1986
1762D	GCD Queries constructive algorithms, interactive, number theory	2100	x3356
1762B	Make Array Good constructive algorithms, implementation, number theory, sortings	1100	x16572
1762A	Divide and Conquer greedy, math, number theory	800	x18771
1759F	All Possible Digits binary search, data structures, greedy, math, number theory	1800	x3790
1759D	Make It Round brute force, number theory	1400	x12759
1758C	Almost All Multiples greedy, number theory	1400	x13241
1753B	Factorial Divisibility math, number theory	1600	x12360
1750D	Count GCD combinatorics, math, number theory	1800	x5697
1749D	Counting Arrays combinatorics, dp, math, number theory	1900	x5404
1748D	ConstructOR bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory	2100	x2707
1744E2	Divisible Numbers (hard version) brute force, math, number theory	1900	x5416
1744E1	Divisible Numbers (easy version) brute force, math, number theory	1500	x10504
1742D	Coprime brute force, greedy, number theory	1100	x22484
1740I	Arranging Crystal Balls data structures, divide and conquer, divide and conquer, dp, geometry, graphs, number theory	3500	x108
1740A	Factorise N+M constructive algorithms, number theory	800	x19830
1737F	Ela and Prime GCD constructive algorithms, math, number theory	3300	x122
1736B	Playing with GCD math, number theory	1200	x17534
1734E	Rectangular Congruence constructive algorithms, number theory	2100	x2826
1732E	Location data structures, dp, math, number theory	2800	x419
1732D2	Balance (Hard version) brute force, data structures, number theory	2400	x1379
1732D1	Balance (Easy version) brute force, data structures, implementation, number theory	1500	x8451
1732A	Bestie brute force, combinatorics, constructive algorithms, implementation, math, number theory	1000	x14632
1731E	Graph Cost dp, greedy, math, number theory	2000	x2719
1731C	Even Subarrays bitmasks, brute force, hashing, math, number theory	1700	x9190
1730E	Maximums and Minimums combinatorics, data structures, divide and conquer, number theory	2700	x618
1728E	Red-Black Pepper brute force, data structures, greedy, math, number theory	2300	x1673
1725E	Electrical Efficiency combinatorics, data structures, dp, math, number theory, trees	2500	x448
1720A	Burenka Plays with Fractions math, number theory	900	x21998
1718F	Burenka, an Array and Queries data structures, math, number theory	3300	x147
1718C	Tonya and Burenka-179 data structures, greedy, math, number theory	2400	x1542
1718B	Fibonacci Strings greedy, implementation, math, number theory	2000	x2919
1717E	Madoka and The Best University math, number theory	2200	x2544
1717A	Madoka and Strange Thoughts math, number theory	800	x19261
1716F	Bags with Balls combinatorics, dp, math, number theory	2500	x1010
1714E	Add Modulo 10 brute force, math, number theory	1400	x15786
1713D	Tournament Countdown constructive algorithms, greedy, interactive, number theory, probabilities	1800	x5542
1712E2	LCM Sum (hard version) brute force, data structures, math, number theory, two pointers	2500	x1207
1712E1	LCM Sum (easy version) binary search, brute force, combinatorics, math, number theory, two pointers	2300	x2077
1712B	Woeful Permutation constructive algorithms, greedy, number theory	800	x21378
1707F	Bugaboo bitmasks, constructive algorithms, dp, number theory	3500	x146
1706D2	Chopping Carrots (Hard Version) brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers	2400	x1664
1706D1	Chopping Carrots (Easy Version) binary search, brute force, constructive algorithms, greedy, number theory	1700	x6760
1702F	Equate Multisets constructive algorithms, data structures, greedy, math, number theory	1700	x8112
1699E	Three Days Grace data structures, dp, greedy, math, number theory, two pointers	2600	x1108
1698G	Long Binary String bitmasks, math, matrices, meet-in-the-middle, number theory	2900	x308
1690F	Shifting String graphs, math, number theory, strings	1700	x6936
1687E	Become Big For Me combinatorics, constructive algorithms, greedy, math, number theory	3500	x222
1684G	Euclid Guess constructive algorithms, flows, graph matchings, math, number theory	2800	x584
1679A	AvtoBus brute force, greedy, math, number theory	900	x22719
1673E	Power or XOR? bitmasks, combinatorics, math, number theory	2500	x683
1673D	Lost Arithmetic Progression combinatorics, math, number theory	1900	x3233
1673C	Palindrome Basis brute force, dp, math, number theory	1500	x12203
1665D	GCD Guess bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory	2000	x3770
1658E	Gojou and Matrix Game data structures, dp, games, hashing, implementation, math, number theory, sortings	2500	x1030
1658B	Marin and Anti-coprime Permutation combinatorics, math, number theory	800	x18463
1656H	Equal LCM Subsets data structures, math, number theory	3200	x426
1656D	K-good constructive algorithms, math, number theory	1900	x6718
1656C	Make Equal With Mod constructive algorithms, math, number theory, sortings	1200	x18770
1654D	Potion Brewing Class dfs and similar, math, number theory, trees	2100	x2804
1647D	Madoka and the Best School in Russia constructive algorithms, dp, math, number theory	1900	x5186
1646E	Power Board brute force, dp, math, number theory	2200	x2327
1644F	Basis combinatorics, fft, math, number theory	2900	x317
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x6105
1632D	New Year Concert binary search, data structures, greedy, math, number theory, two pointers	2000	x4524
1630F	Making It Bipartite flows, graph matchings, graphs, number theory	3400	x532
1630E	Expected Components combinatorics, math, number theory, probabilities	2900	x431
1630D	Flipping Range constructive algorithms, dp, greedy, number theory	2400	x1538
1629B	GCD Arrays greedy, math, number theory	800	x23140
1627D	Not Adding brute force, dp, math, number theory	1900	x7985
1627C	Not Assigning constructive algorithms, dfs and similar, number theory, trees	1400	x14201
1626F	A Random Code Problem combinatorics, dp, math, number theory, probabilities	2800	x718
1622F	Quadratic Set constructive algorithms, hashing, math, number theory	2900	x606
1617E	Christmas Chocolates dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees	2700	x844