Problemset - Codeforces

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Codeforces Round #678 (Div. 2)
3 days

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Difficulty: —

number theory

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Problems

#	Name
472A	Design Tutorial: Learn from Math math, number theory	800	x29047
749A	Bachgold Problem greedy, implementation, math, number theory	800	x23995
1370A	Maximum GCD greedy, implementation, math, number theory	800	x23452
1325A	EhAb AnD gCd constructive algorithms, greedy, number theory	800	x21120
1389A	LCM Problem constructive algorithms, greedy, math, number theory	800	x20938
630A	Again Twenty Five! number theory	800	x20598
1388A	Captain Flint and Crew Recruitment brute force, greedy, math, number theory	800	x19194
822A	I'm bored with life implementation, math, number theory	800	x18510
1312A	Two Regular Polygons geometry, greedy, math, number theory	800	x17979
755A	PolandBall and Hypothesis brute force, graphs, math, number theory	800	x11628
664A	Complicated GCD math, number theory	800	x10281
313A	Ilya and Bank Account implementation, number theory	900	x25335
1324A	Yet Another Tetris Problem implementation, number theory	900	x18167
1238A	Prime Subtraction math, number theory	900	x15186
199A	Hexadecimal's theorem brute force, constructive algorithms, implementation, number theory	900	x11395
26A	Almost Prime number theory	900	x11310
84A	Toy Army math, number theory	900	x9187
267A	Subtractions math, number theory	900	x3596
122A	Lucky Division brute force, number theory	1000	x53560
577A	Multiplication Table implementation, number theory	1000	x21628
742A	Arpa’s hard exam and Mehrdad’s naive cheat implementation, math, number theory	1000	x18431
1326A	Bad Ugly Numbers constructive algorithms, number theory	1000	x18202
766B	Mahmoud and a Triangle constructive algorithms, geometry, greedy, math, number theory, sortings	1000	x15925
1245A	Good ol' Numbers Coloring math, number theory	1000	x10917
1051B	Relatively Prime Pairs greedy, math, number theory	1000	x10015
1107B	Digital root math, number theory	1000	x9604
17A	Noldbach problem brute force, math, number theory	1000	x6989
299A	Ksusha and Array brute force, number theory, sortings	1000	x4414
177B1	Rectangular Game number theory	1000	x2664
1370B	GCD Compression constructive algorithms, math, number theory	1100	x16376
919B	Perfect Number binary search, brute force, dp, implementation, number theory	1100	x15825
1108B	Divisors of Two Integers brute force, greedy, math, number theory	1100	x14233
483A	Counterexample brute force, implementation, math, number theory	1100	x12322
682A	Alyona and Numbers constructive algorithms, math, number theory	1100	x11685
1166B	All the Vowels Please constructive algorithms, math, number theory	1100	x8723
946B	Weird Subtraction Process math, number theory	1100	x8136
758B	Blown Garland brute force, implementation, number theory	1100	x7980
633A	Ebony and Ivory brute force, math, number theory	1100	x7734
898B	Proper Nutrition brute force, implementation, number theory	1100	x6921
630J	Divisibility math, number theory	1100	x6851
735B	Urbanization greedy, number theory, sortings	1100	x6665
797A	k-Factorization implementation, math, number theory	1100	x6474
1033B	Square Difference math, number theory	1100	x5814
858A	k-rounding brute force, math, number theory	1100	x5789
68A	Irrational problem implementation, number theory	1100	x3303
1364A	XXXXX brute force, data structures, number theory, two pointers	1200	x15333
1409C	Yet Another Array Restoration brute force, math, number theory	1200	x14413
456B	Fedya and Maths math, number theory	1200	x10630
1149A	Prefix Sum Primes constructive algorithms, greedy, math, number theory	1200	x9708
776B	Sherlock and his girlfriend constructive algorithms, number theory	1200	x9462
1076B	Divisor Subtraction implementation, math, number theory	1200	x8488
1277B	Make Them Odd greedy, number theory	1200	x8385
1133B	Preparation for International Women's Day math, number theory	1200	x8178
787A	The Monster brute force, math, number theory	1200	x8080
1143B	Nirvana brute force, math, number theory	1200	x7014
1068B	LCM math, number theory	1200	x6905
660A	Co-prime Array greedy, implementation, math, number theory	1200	x5255
361B	Levko and Permutation constructive algorithms, math, number theory	1200	x4981
817A	Treasure Hunt implementation, math, number theory	1200	x4444
59B	Fortune Telling implementation, number theory	1200	x3993
1184A1	Heidi Learns Hashing (Easy) brute force, math, number theory	1200	x3913
172B	Pseudorandom Sequence Period *special problem, implementation, number theory	1200	x2058
177B2	Rectangular Game number theory	1200	x1991
230B	T-primes binary search, implementation, math, number theory	1300	x29597
1360D	Buying Shovels math, number theory	1300	x16568
1294C	Product of Three Numbers greedy, math, number theory	1300	x15750
1372B	Omkar and Last Class of Math greedy, math, number theory	1300	x15624
1401C	Mere Array constructive algorithms, math, number theory, sortings	1300	x14067
519C	A and B and Team Training greedy, implementation, math, number theory	1300	x14006
573A	Bear and Poker implementation, math, number theory	1300	x11570
1407B	Big Vova brute force, greedy, math, number theory	1300	x10904
1174C	Ehab and a Special Coloring Problem constructive algorithms, number theory	1300	x8608
1220B	Multiplication Table math, number theory	1300	x8464
271B	Prime Matrix binary search, brute force, math, number theory	1300	x7340
912B	New Year's Eve bitmasks, constructive algorithms, number theory	1300	x6961
870C	Maximum splitting dp, greedy, math, number theory	1300	x6952
1155C	Alarm Clocks Everywhere math, number theory	1300	x6746
236B	Easy Number Challenge implementation, number theory	1300	x6689
1209B	Koala and Lights implementation, math, number theory	1300	x6404
371B	Fox Dividing Cheese math, number theory	1300	x6351
876B	Divisiblity of Differences implementation, math, number theory	1300	x6296
840A	Leha and Function combinatorics, greedy, math, number theory, sortings	1300	x6242
515B	Drazil and His Happy Friends brute force, dsu, meet-in-the-middle, number theory	1300	x6050
1113B	Sasha and Magnetic Machines greedy, number theory	1300	x6036
900B	Position in Fraction math, number theory	1300	x5965
158D	Ice Sculptures *special problem, brute force, number theory	1300	x5542
633B	A Trivial Problem brute force, constructive algorithms, math, number theory	1300	x5001
123A	Prime Permutation implementation, number theory, strings	1300	x2363
1370C	Number Game games, math, number theory	1400	x13831
1350B	Orac and Models dp, math, number theory	1400	x12075
1285C	Fadi and LCM brute force, math, number theory	1400	x12051
1332B	Composite Coloring brute force, constructive algorithms, greedy, math, number theory	1400	x11892
414B	Mashmokh and ACM combinatorics, dp, number theory	1400	x11775
1312C	Adding Powers bitmasks, greedy, implementation, math, number theory, ternary search	1400	x10525
762A	k-th divisor math, number theory	1400	x9519
1263C	Everyone is a Winner! binary search, math, meet-in-the-middle, number theory	1400	x8671
1200C	Round Corridor math, number theory	1400	x7433
1091C	New Year and the Sphere Transmission math, number theory	1400	x7209
1266C	Diverse Matrix constructive algorithms, greedy, math, number theory	1400	x6882
757B	Bash's Big Day greedy, math, number theory	1400	x6582

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