Problemset - Codeforces

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Educational Codeforces Round 109 (Rated for Div. 2)
22:35:09
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number theory

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Problems

#	Name
472A	Design Tutorial: Learn from Math math, number theory	800	x33168
749A	Bachgold Problem greedy, implementation, math, number theory	800	x27468
1370A	Maximum GCD greedy, implementation, math, number theory	800	x27225
630A	Again Twenty Five! number theory	800	x24341
1325A	EhAb AnD gCd constructive algorithms, greedy, number theory	800	x23991
1389A	LCM Problem constructive algorithms, greedy, math, number theory	800	x23865
1388A	Captain Flint and Crew Recruitment brute force, greedy, math, number theory	800	x20931
822A	I'm bored with life implementation, math, number theory	800	x20370
1520B	Ordinary Numbers brute force, math, number theory	800	x20064
1455A	Strange Functions math, number theory	800	x19837
1312A	Two Regular Polygons geometry, greedy, math, number theory	800	x19798
1514A	Perfectly Imperfect Array math, number theory	800	x16735
755A	PolandBall and Hypothesis brute force, graphs, math, number theory	800	x12807
664A	Complicated GCD math, number theory	800	x11261
313A	Ilya and Bank Account implementation, number theory	900	x29499
1475A	Odd Divisor math, number theory	900	x26069
1324A	Yet Another Tetris Problem implementation, number theory	900	x19647
1471A	Strange Partition greedy, math, number theory	900	x17109
1238A	Prime Subtraction math, number theory	900	x16697
199A	Hexadecimal's theorem brute force, constructive algorithms, implementation, number theory	900	x13494
26A	Almost Prime number theory	900	x13397
84A	Toy Army math, number theory	900	x10208
267A	Subtractions math, number theory	900	x4195
122A	Lucky Division brute force, number theory	1000	x62800
577A	Multiplication Table implementation, number theory	1000	x24076
742A	Arpa’s hard exam and Mehrdad’s naive cheat implementation, math, number theory	1000	x21211
1326A	Bad Ugly Numbers constructive algorithms, number theory	1000	x20098
1473B	String LCM brute force, math, number theory, strings	1000	x18385
766B	Mahmoud and a Triangle constructive algorithms, geometry, greedy, math, number theory, sortings	1000	x17877
1474B	Different Divisors binary search, constructive algorithms, greedy, math, number theory	1000	x16398
1521A	Nastia and Nearly Good Numbers constructive algorithms, math, number theory	1000	x16146
1485A	Add and Divide brute force, greedy, math, number theory	1000	x13655
1515B	Phoenix and Puzzle brute force, geometry, math, number theory	1000	x13447
1411B	Fair Numbers brute force, number theory	1000	x12101
1245A	Good ol' Numbers Coloring math, number theory	1000	x11677
1051B	Relatively Prime Pairs greedy, math, number theory	1000	x11126
1107B	Digital root math, number theory	1000	x10406
17A	Noldbach problem brute force, math, number theory	1000	x8108
299A	Ksusha and Array brute force, number theory, sortings	1000	x5002
177B1	Rectangular Game number theory	1000	x2906
1370B	GCD Compression constructive algorithms, math, number theory	1100	x17957
919B	Perfect Number binary search, brute force, dp, implementation, number theory	1100	x17634
1108B	Divisors of Two Integers brute force, greedy, math, number theory	1100	x15597
483A	Counterexample brute force, implementation, math, number theory	1100	x13951
1511B	GCD Length constructive algorithms, math, number theory	1100	x13672
682A	Alyona and Numbers constructive algorithms, math, number theory	1100	x12951
1166B	All the Vowels Please constructive algorithms, math, number theory	1100	x9389
946B	Weird Subtraction Process math, number theory	1100	x8730
633A	Ebony and Ivory brute force, math, number theory	1100	x8421
758B	Blown Garland brute force, implementation, number theory	1100	x8380
630J	Divisibility math, number theory	1100	x7421
898B	Proper Nutrition brute force, implementation, number theory	1100	x7390
797A	k-Factorization implementation, math, number theory	1100	x7290
735B	Urbanization greedy, number theory, sortings	1100	x7013
1033B	Square Difference math, number theory	1100	x6356
858A	k-rounding brute force, math, number theory	1100	x6159
68A	Irrational problem implementation, number theory	1100	x3471
1364A	XXXXX brute force, data structures, number theory, two pointers	1200	x17398
1409C	Yet Another Array Restoration brute force, math, number theory	1200	x16580
1487B	Cat Cycle math, number theory	1200	x12127
456B	Fedya and Maths math, number theory	1200	x11404
776B	Sherlock and his girlfriend constructive algorithms, number theory	1200	x10918
1149A	Prefix Sum Primes constructive algorithms, greedy, math, number theory	1200	x10720
1277B	Make Them Odd greedy, number theory	1200	x9562
1076B	Divisor Subtraction implementation, math, number theory	1200	x9227
1133B	Preparation for International Women's Day math, number theory	1200	x8817
787A	The Monster brute force, math, number theory	1200	x8526
1068B	LCM math, number theory	1200	x7720
1143B	Nirvana brute force, math, number theory	1200	x7482
660A	Co-prime Array greedy, implementation, math, number theory	1200	x5765
361B	Levko and Permutation constructive algorithms, math, number theory	1200	x5699
817A	Treasure Hunt implementation, math, number theory	1200	x4784
59B	Fortune Telling implementation, number theory	1200	x4436
1184A1	Heidi Learns Hashing (Easy) brute force, math, number theory	1200	x4255
172B	Pseudorandom Sequence Period *special problem, implementation, number theory	1200	x2147
177B2	Rectangular Game number theory	1200	x2120
230B	T-primes binary search, implementation, math, number theory	1300	x35102
1360D	Buying Shovels math, number theory	1300	x18699
1294C	Product of Three Numbers greedy, math, number theory	1300	x18044
1372B	Omkar and Last Class of Math greedy, math, number theory	1300	x17469
1401C	Mere Array constructive algorithms, math, number theory, sortings	1300	x16000
519C	A and B and Team Training greedy, implementation, math, number theory	1300	x15008
1454D	Number into Sequence constructive algorithms, math, number theory	1300	x12563
573A	Bear and Poker implementation, math, number theory	1300	x12397
1407B	Big Vova brute force, greedy, math, number theory	1300	x12365
1521B	Nastia and a Good Array constructive algorithms, math, number theory	1300	x10677
1174C	Ehab and a Special Coloring Problem constructive algorithms, number theory	1300	x9258
1220B	Multiplication Table math, number theory	1300	x9141
271B	Prime Matrix binary search, brute force, math, number theory	1300	x8323
236B	Easy Number Challenge implementation, number theory	1300	x7836
912B	New Year's Eve bitmasks, constructive algorithms, number theory	1300	x7580
870C	Maximum splitting dp, greedy, math, number theory	1300	x7460
371B	Fox Dividing Cheese math, number theory	1300	x7264
1155C	Alarm Clocks Everywhere math, number theory	1300	x7230
876B	Divisiblity of Differences implementation, math, number theory	1300	x6875
1209B	Koala and Lights implementation, math, number theory	1300	x6733
840A	Leha and Function combinatorics, greedy, math, number theory, sortings	1300	x6416
1113B	Sasha and Magnetic Machines greedy, number theory	1300	x6390
515B	Drazil and His Happy Friends brute force, dsu, meet-in-the-middle, number theory	1300	x6314
900B	Position in Fraction math, number theory	1300	x6310

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