Problemset - Codeforces

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Codeforces Round (Div. 3)
7 days

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Difficulty: —

number theory

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Problems

#	Name
1789E	Serval and Music Game brute force, dp, implementation, math, number theory	2500	x777
1789A	Serval and Mocha's Array brute force, math, number theory	800	x17483
1787B	Number Factorization greedy, math, number theory	1100	x12856
1783E	Game of the Year brute force, data structures, math, number theory	2300	x2044
1781D	Many Perfect Squares brute force, math, number theory	1800	x5325
1780G	Delicious Dessert binary search, dsu, hashing, math, number theory, string suffix structures	2400	x678
1780F	Three Chairs bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings	2300	x1402
1780E	Josuke and Complete Graph binary search, brute force, data structures, math, number theory	2400	x1325
1780B	GCD Partition brute force, greedy, math, number theory	1100	x16962
1778F	Maximizing Root dfs and similar, dp, graphs, math, number theory, trees	2600	x607
1777C	Quiz Master binary search, math, number theory, sortings, two pointers	1700	x7978
1775D	Friendly Spiders dfs and similar, graphs, math, number theory, shortest paths	1800	x5891
1771C	Hossam and Trainees greedy, math, number theory	1600	x9225
1770F	Koxia and Sequence bitmasks, combinatorics, dp, math, number theory	3100	x626
1770C	Koxia and Number Theory brute force, chinese remainder theorem, math, number theory	1700	x8350
1768E	Partial Sorting combinatorics, math, number theory	2300	x1797
1768A	Greatest Convex greedy, math, number theory	800	x28185
1766D	Lucky Chains math, number theory	1600	x8564
1765M	Minimum LCM math, number theory	1000	x13342
1764B	Doremy's Perfect Math Class math, number theory	900	x15550
1763E	Node Pairs dp, graphs, math, number theory	2200	x1721
1763D	Valid Bitonic Permutations combinatorics, dp, implementation, math, number theory	2200	x1982
1762D	GCD Queries constructive algorithms, interactive, number theory	2100	x3337
1762B	Make Array Good constructive algorithms, implementation, number theory, sortings	1100	x16461
1762A	Divide and Conquer greedy, math, number theory	800	x18703
1759F	All Possible Digits binary search, data structures, greedy, math, number theory	1800	x3767
1759D	Make It Round brute force, number theory	1400	x12609
1758C	Almost All Multiples greedy, number theory	1400	x13160
1753B	Factorial Divisibility math, number theory	1600	x12268
1750D	Count GCD combinatorics, math, number theory	1800	x5646
1749D	Counting Arrays combinatorics, dp, math, number theory	1900	x5368
1748D	ConstructOR bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory	2100	x2691
1744E2	Divisible Numbers (hard version) brute force, math, number theory	1900	x5359
1744E1	Divisible Numbers (easy version) brute force, math, number theory	1500	x10391
1742D	Coprime brute force, greedy, number theory	1100	x22241
1740I	Arranging Crystal Balls data structures, divide and conquer, divide and conquer, dp, geometry, graphs, number theory	3500	x106
1740A	Factorise N+M constructive algorithms, number theory	800	x19775
1737F	Ela and Prime GCD constructive algorithms, math, number theory	3300	x121
1736B	Playing with GCD math, number theory	1200	x17442
1734E	Rectangular Congruence constructive algorithms, number theory	2100	x2813
1732E	Location data structures, dp, math, number theory	2800	x419
1732D2	Balance (Hard version) brute force, data structures, number theory	2400	x1375
1732D1	Balance (Easy version) brute force, data structures, implementation, number theory	1500	x8388
1732A	Bestie brute force, combinatorics, constructive algorithms, implementation, math, number theory	1000	x14547
1731E	Graph Cost dp, greedy, math, number theory	2000	x2703
1731C	Even Subarrays bitmasks, brute force, hashing, math, number theory	1700	x9118
1730E	Maximums and Minimums combinatorics, data structures, divide and conquer, number theory	2700	x617
1728E	Red-Black Pepper brute force, data structures, greedy, math, number theory	2300	x1668
1725E	Electrical Efficiency combinatorics, data structures, dp, math, number theory, trees	2500	x441
1720A	Burenka Plays with Fractions math, number theory	900	x21915
1718F	Burenka, an Array and Queries data structures, math, number theory	3300	x146
1718C	Tonya and Burenka-179 data structures, greedy, math, number theory	2400	x1534
1718B	Fibonacci Strings greedy, implementation, math, number theory	2000	x2903
1717E	Madoka and The Best University math, number theory	2200	x2526
1717A	Madoka and Strange Thoughts math, number theory	800	x19231
1716F	Bags with Balls combinatorics, dp, math, number theory	2500	x1007
1714E	Add Modulo 10 brute force, math, number theory	1400	x15625
1713D	Tournament Countdown constructive algorithms, greedy, interactive, number theory, probabilities	1800	x5516
1712E2	LCM Sum (hard version) brute force, data structures, math, number theory, two pointers	2500	x1192
1712E1	LCM Sum (easy version) binary search, brute force, combinatorics, math, number theory, two pointers	2300	x2061
1712B	Woeful Permutation constructive algorithms, greedy, number theory	800	x21332
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	x1662
1706D1	Chopping Carrots (Easy Version) binary search, brute force, constructive algorithms, greedy, number theory	1700	x6738
1702F	Equate Multisets constructive algorithms, data structures, greedy, math, number theory	1700	x8052
1699E	Three Days Grace data structures, dp, greedy, math, number theory, two pointers	2600	x1106
1698G	Long Binary String bitmasks, math, matrices, meet-in-the-middle, number theory	2900	x307
1690F	Shifting String graphs, math, number theory, strings	1700	x6898
1687E	Become Big For Me combinatorics, constructive algorithms, greedy, math, number theory	3500	x221
1684G	Euclid Guess constructive algorithms, flows, graph matchings, math, number theory	2800	x583
1679A	AvtoBus brute force, greedy, math, number theory	900	x22491
1673E	Power or XOR? bitmasks, combinatorics, math, number theory	2500	x670
1673D	Lost Arithmetic Progression combinatorics, math, number theory	1900	x3220
1673C	Palindrome Basis brute force, dp, math, number theory	1500	x12093
1665D	GCD Guess bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory	2000	x3752
1658E	Gojou and Matrix Game data structures, dp, games, hashing, implementation, math, number theory, sortings	2500	x1028
1658B	Marin and Anti-coprime Permutation combinatorics, math, number theory	800	x18432
1656H	Equal LCM Subsets data structures, math, number theory	3200	x421
1656D	K-good constructive algorithms, math, number theory	1900	x6689
1656C	Make Equal With Mod constructive algorithms, math, number theory, sortings	1200	x18692
1654D	Potion Brewing Class dfs and similar, math, number theory, trees	2100	x2799
1647D	Madoka and the Best School in Russia constructive algorithms, dp, math, number theory	1900	x5164
1646E	Power Board brute force, dp, math, number theory	2200	x2318
1644F	Basis combinatorics, fft, math, number theory	2900	x316
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x6075
1632D	New Year Concert binary search, data structures, greedy, math, number theory, two pointers	2000	x4508
1630F	Making It Bipartite flows, graph matchings, graphs, number theory	3400	x530
1630E	Expected Components combinatorics, math, number theory, probabilities	2900	x430
1630D	Flipping Range constructive algorithms, dp, greedy, number theory	2400	x1530
1629B	GCD Arrays greedy, math, number theory	800	x23080
1627D	Not Adding brute force, dp, math, number theory	1900	x7929
1627C	Not Assigning constructive algorithms, dfs and similar, number theory, trees	1400	x14159
1626F	A Random Code Problem combinatorics, dp, math, number theory, probabilities	2800	x716
1622F	Quadratic Set constructive algorithms, hashing, math, number theory	2900	x604
1617E	Christmas Chocolates dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees	2700	x843
1617B	GCD Problem brute force, constructive algorithms, math, number theory	900	x22656
1614D2	Divan and Kostomuksha (hard version) dp, number theory	2300	x2207
1614D1	Divan and Kostomuksha (easy version) dp, number theory	2100	x3690
1612D	X-Magic Pair math, number theory	1600	x8910
1610D	Not Quite Lee combinatorics, dp, math, number theory	2000	x2623