Problemset - Codeforces

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Educational Codeforces Round 165 (Rated for Div. 2)
34:51:49
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number theory

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Problems

#	Name
630A	Again Twenty Five! number theory	800	x61666
472A	Design Tutorial: Learn from Math math, number theory	800	x56848
1370A	Maximum GCD greedy, implementation, math, number theory	800	x48573
749A	Bachgold Problem greedy, implementation, math, number theory	800	x46316
1520B	Ordinary Numbers brute force, math, number theory	800	x42699
1389A	LCM Problem constructive algorithms, greedy, math, number theory	800	x38236
1325A	EhAb AnD gCd constructive algorithms, greedy, number theory	800	x38021
1899A	Game with Integers games, math, number theory	800	x37344
822A	I'm bored with life implementation, math, number theory	800	x31614
1549A	Gregor and Cryptography math, number theory	800	x31271
1553A	Digits Sum math, number theory	800	x30067
1933B	Turtle Math: Fast Three Task implementation, math, number theory	800	x29579
1859A	United We Stand constructive algorithms, math, number theory	800	x29087
1768A	Greatest Convex greedy, math, number theory	800	x27923
1455A	Strange Functions math, number theory	800	x25983
1312A	Two Regular Polygons geometry, greedy, math, number theory	800	x25289
1525A	Potion-making math, number theory	800	x25043
1388A	Captain Flint and Crew Recruitment brute force, greedy, math, number theory	800	x24527
1916A	2023 constructive algorithms, implementation, math, number theory	800	x24444
1845A	Forbidden Integer constructive algorithms, implementation, math, number theory	800	x24426
1514A	Perfectly Imperfect Array math, number theory	800	x23768
1629B	GCD Arrays greedy, math, number theory	800	x22945
1712B	Woeful Permutation constructive algorithms, greedy, number theory	800	x21212
1605A	A.M. Deviation math, number theory	800	x20317
1740A	Factorise N+M constructive algorithms, number theory	800	x19574
1717A	Madoka and Strange Thoughts math, number theory	800	x19103
1762A	Divide and Conquer greedy, math, number theory	800	x18504
1658B	Marin and Anti-coprime Permutation combinatorics, math, number theory	800	x18346
755A	PolandBall and Hypothesis brute force, graphs, math, number theory	800	x17501
664A	Complicated GCD math, number theory	800	x17374
1810B	Candies constructive algorithms, math, number theory	800	x17117
1816A	Ian Visits Mary constructive algorithms, geometry, number theory	800	x16915
1789A	Serval and Mocha's Array brute force, math, number theory	800	x16860
1583A	Windblume Ode math, number theory	800	x13526
1581A	CQXYM Count Permutations combinatorics, math, number theory	800	x13238
1475A	Odd Divisor math, number theory	900	x54877
313A	Ilya and Bank Account implementation, number theory	900	x53434
1535B	Array Reodering brute force, greedy, math, number theory, sortings	900	x29526
26A	Almost Prime number theory	900	x28433
1543A	Exciting Bets greedy, math, number theory	900	x26289
1324A	Yet Another Tetris Problem implementation, number theory	900	x25254
199A	Hexadecimal's theorem brute force, constructive algorithms, implementation, number theory	900	x25010
1471A	Strange Partition greedy, math, number theory	900	x24421
1855B	Longest Divisors Interval brute force, combinatorics, greedy, math, number theory	900	x23597
1238A	Prime Subtraction math, number theory	900	x23233
1617B	GCD Problem brute force, constructive algorithms, math, number theory	900	x22351
1679A	AvtoBus brute force, greedy, math, number theory	900	x21750
1720A	Burenka Plays with Fractions math, number theory	900	x21699
1828B	Permutation Swap math, number theory	900	x20527
1945B	Fireworks math, number theory	900	x19144
1609A	Divide and Multiply greedy, implementation, math, number theory	900	x16647
1764B	Doremy's Perfect Math Class math, number theory	900	x15228
84A	Toy Army math, number theory	900	x14539
267A	Subtractions math, number theory	900	x7120
122A	Lucky Division brute force, number theory	1000	x115635
742A	Arpa’s hard exam and Mehrdad’s naive cheat implementation, math, number theory	1000	x39731
577A	Multiplication Table implementation, number theory	1000	x37960
1521A	Nastia and Nearly Good Numbers constructive algorithms, math, number theory	1000	x35236
766B	Mahmoud and a Triangle constructive algorithms, geometry, greedy, math, number theory, sortings	1000	x31014
1473B	String LCM brute force, math, number theory, strings	1000	x29606
1326A	Bad Ugly Numbers constructive algorithms, number theory	1000	x29340
1474B	Different Divisors binary search, constructive algorithms, greedy, math, number theory	1000	x26241
1515B	Phoenix and Puzzle brute force, geometry, math, number theory	1000	x24088
1916B	Two Divisors constructive algorithms, math, number theory	1000	x23481
1858C	Yet Another Permutation Problem constructive algorithms, greedy, math, number theory	1000	x21873
1485A	Add and Divide brute force, greedy, math, number theory	1000	x20753
1562B	Scenes From a Memory brute force, constructive algorithms, implementation, math, number theory	1000	x19154
1411B	Fair Numbers brute force, number theory	1000	x17720
1051B	Relatively Prime Pairs greedy, math, number theory	1000	x16468
17A	Noldbach problem brute force, math, number theory	1000	x15001
1107B	Digital root math, number theory	1000	x14800
1732A	Bestie brute force, combinatorics, constructive algorithms, implementation, math, number theory	1000	x14388
1245A	Good ol' Numbers Coloring math, number theory	1000	x13878
1765M	Minimum LCM math, number theory	1000	x12531
299A	Ksusha and Array brute force, number theory, sortings	1000	x7718
177B1	Rectangular Game number theory	1000	x3988
919B	Perfect Number binary search, brute force, dp, implementation, number theory	1100	x26793
1370B	GCD Compression constructive algorithms, math, number theory	1100	x23061
1108B	Divisors of Two Integers brute force, greedy, math, number theory	1100	x22346
483A	Counterexample brute force, implementation, math, number theory	1100	x22136
1511B	GCD Length constructive algorithms, math, number theory	1100	x21924
1872C	Non-coprime Split math, number theory	1100	x21851
1742D	Coprime brute force, greedy, number theory	1100	x21475
682A	Alyona and Numbers constructive algorithms, math, number theory	1100	x20419
1933C	Turtle Fingers: Count the Values of k brute force, implementation, math, number theory	1100	x20224
1593D1	All are Same math, number theory	1100	x19538
1950D	Product of Binary Decimals brute force, dp, implementation, number theory	1100	x19527
1932B	Chaya Calendar number theory	1100	x18164
1899B	250 Thousand Tons of TNT brute force, implementation, number theory	1100	x17943
1780B	GCD Partition brute force, greedy, math, number theory	1100	x16492
1762B	Make Array Good constructive algorithms, implementation, number theory, sortings	1100	x16158
1826B	Lunatic Never Content math, number theory	1100	x15640
797A	k-Factorization implementation, math, number theory	1100	x13920
1787B	Number Factorization greedy, math, number theory	1100	x12663
633A	Ebony and Ivory brute force, math, number theory	1100	x12285
1166B	All the Vowels Please constructive algorithms, math, number theory	1100	x11198
630J	Divisibility math, number theory	1100	x10657
946B	Weird Subtraction Process math, number theory	1100	x10656
758B	Blown Garland brute force, implementation, number theory	1100	x10033
898B	Proper Nutrition brute force, implementation, number theory	1100	x9252

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