Problemset - Codeforces

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Educational Codeforces Round 165 (Rated for Div. 2)
37:34:46
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number theory

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Problems

#	Name
1143B	Nirvana brute force, math, number theory	1200	x9949
1877C	Joyboard math, number theory	1200	x9998
758B	Blown Garland brute force, implementation, number theory	1100	x10033
1744E1	Divisible Numbers (easy version) brute force, math, number theory	1500	x10171
1858B	The Walkway brute force, dp, greedy, math, number theory	1500	x10577
946B	Weird Subtraction Process math, number theory	1100	x10656
630J	Divisibility math, number theory	1100	x10657
1875C	Jellyfish and Green Apple bitmasks, greedy, math, number theory	1400	x10736
371B	Fox Dividing Cheese math, number theory	1300	x10893
1133D	Zero Quantity Maximization hashing, math, number theory	1500	x10901
787A	The Monster brute force, math, number theory	1200	x11026
1068B	LCM math, number theory	1200	x11073
546D	Soldier and Number Game constructive algorithms, dp, math, number theory	1700	x11192
1166B	All the Vowels Please constructive algorithms, math, number theory	1100	x11198
912B	New Year's Eve bitmasks, constructive algorithms, number theory	1300	x11306
1220B	Multiplication Table math, number theory	1300	x11331
1950E	Nearly Shortest Repeating Substring brute force, implementation, number theory, strings	1500	x11362
1804C	Pull Your Luck brute force, greedy, math, number theory	1500	x11473
1811E	Living Sequence binary search, dp, math, number theory	1500	x11500
1325D	Ehab the Xorcist bitmasks, constructive algorithms, greedy, number theory	1700	x11510
1844D	Row Major constructive algorithms, greedy, math, number theory, strings	1400	x11580
1823C	Strongly Composite greedy, math, number theory	1300	x11635
1673C	Palindrome Basis brute force, dp, math, number theory	1500	x11647
1920C	Partitioning the Array brute force, math, number theory	1600	x11711
1174C	Ehab and a Special Coloring Problem constructive algorithms, number theory	1300	x11787
743C	Vladik and fractions brute force, constructive algorithms, math, number theory	1500	x11811
1537D	Deleting Divisors games, math, number theory	1700	x11824
75C	Modified GCD binary search, number theory	1600	x11958
1753B	Factorial Divisibility math, number theory	1600	x11999
1759D	Make It Round brute force, number theory	1400	x12012
460B	Little Dima and Equation brute force, implementation, math, number theory	1500	x12077
1899D	Yarik and Musical Notes hashing, math, number theory	1300	x12113
1902C	Insert and Equalize brute force, constructive algorithms, greedy, math, number theory	1300	x12147
1242A	Tile Painting constructive algorithms, math, number theory	1500	x12262
707C	Pythagorean Triples math, number theory	1500	x12268
633A	Ebony and Ivory brute force, math, number theory	1100	x12285
1133B	Preparation for International Women's Day math, number theory	1200	x12323
271B	Prime Matrix binary search, brute force, math, number theory	1300	x12339
1379B	Dubious Cyrpto binary search, brute force, math, number theory	1500	x12463
1076B	Divisor Subtraction implementation, math, number theory	1200	x12521
1765M	Minimum LCM math, number theory	1000	x12531
1444A	Division brute force, math, number theory	1500	x12533
1864C	Divisor Chain bitmasks, constructive algorithms, math, number theory	1300	x12544
735D	Taxes math, number theory	1600	x12621
1787B	Number Factorization greedy, math, number theory	1100	x12663
1826C	Dreaming of Freedom greedy, math, number theory	1300	x12744
1758C	Almost All Multiples greedy, number theory	1400	x12865
1538D	Another Problem About Dividing Numbers constructive algorithms, math, number theory	1700	x13014
1603B	Moderate Modular Mode constructive algorithms, math, number theory	1600	x13050
1601A	Array Elimination bitmasks, greedy, math, number theory	1300	x13148
576A	Vasya and Petya's Game math, number theory	1500	x13148
1581A	CQXYM Count Permutations combinatorics, math, number theory	800	x13238
1263C	Everyone is a Winner! binary search, math, meet-in-the-middle, number theory	1400	x13300
1838C	No Prime Differences constructive algorithms, math, number theory	1400	x13392
236B	Easy Number Challenge implementation, number theory	1300	x13430
1542C	Strange Function math, number theory	1600	x13485
1536C	Diluc and Kaeya data structures, dp, hashing, number theory	1500	x13518
1583A	Windblume Ode math, number theory	800	x13526
1305C	Kuroni and Impossible Calculation brute force, combinatorics, math, number theory	1600	x13542
1342C	Yet Another Counting Problem math, number theory	1600	x13585
1909B	Make Almost Equal With Mod bitmasks, constructive algorithms, math, number theory	1200	x13698
1606C	Banknotes greedy, number theory	1400	x13714
1245A	Good ol' Numbers Coloring math, number theory	1000	x13878
797A	k-Factorization implementation, math, number theory	1100	x13920
1627C	Not Assigning constructive algorithms, dfs and similar, number theory, trees	1400	x14013
1514C	Product 1 Modulo N greedy, number theory	1600	x14227
1881D	Divide and Equalize math, number theory	1300	x14233
1397B	Power Sequence brute force, math, number theory, sortings	1500	x14342
1732A	Bestie brute force, combinatorics, constructive algorithms, implementation, math, number theory	1000	x14388
1954C	Long Multiplication greedy, math, number theory	1200	x14538
84A	Toy Army math, number theory	900	x14539
1277B	Make Them Odd greedy, number theory	1200	x14605
1149A	Prefix Sum Primes constructive algorithms, greedy, math, number theory	1200	x14652
1107B	Digital root math, number theory	1000	x14800
1396A	Multiples of Length constructive algorithms, greedy, number theory	1600	x14944
17A	Noldbach problem brute force, math, number theory	1000	x15001
1165D	Almost All Divisors math, number theory	1600	x15105
1344A	Hilbert's Hotel math, number theory, sortings	1600	x15171
1714E	Add Modulo 10 brute force, math, number theory	1400	x15190
1764B	Doremy's Perfect Math Class math, number theory	900	x15228
1931D	Divisible Pairs combinatorics, math, number theory	1300	x15632
1826B	Lunatic Never Content math, number theory	1100	x15640
1312C	Adding Powers bitmasks, greedy, implementation, math, number theory, ternary search	1400	x15774
1349A	Orac and LCM data structures, math, number theory	1600	x15859
1458A	Row GCD math, number theory	1600	x15918
1519C	Berland Regional brute force, data structures, greedy, number theory, sortings	1400	x15922
456B	Fedya and Maths math, number theory	1200	x15965
1603A	Di-visible Confusion constructive algorithms, math, number theory	1300	x16086
1762B	Make Array Good constructive algorithms, implementation, number theory, sortings	1100	x16158
1462D	Add to Neighbour and Remove greedy, math, number theory	1400	x16196
573A	Bear and Poker implementation, math, number theory	1300	x16271
1051B	Relatively Prime Pairs greedy, math, number theory	1000	x16468
1780B	GCD Partition brute force, greedy, math, number theory	1100	x16491
1609A	Divide and Multiply greedy, implementation, math, number theory	900	x16647
1407B	Big Vova brute force, greedy, math, number theory	1300	x16665
235A	LCM Challenge number theory	1600	x16772
1789A	Serval and Mocha's Array brute force, math, number theory	800	x16860
1816A	Ian Visits Mary constructive algorithms, geometry, number theory	800	x16915
1487D	Pythagorean Triples binary search, brute force, math, number theory	1500	x16956
1850F	We Were Both Children brute force, implementation, math, number theory	1300	x16986