Problemset - Codeforces

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Educational Codeforces Round 165 (Rated for Div. 2)
24:56:44
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number theory

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Problems

#	Name
122A	Lucky Division brute force, number theory	1000	x115645
230B	T-primes binary search, implementation, math, number theory	1300	x69640
630A	Again Twenty Five! number theory	800	x61680
472A	Design Tutorial: Learn from Math math, number theory	800	x56852
1475A	Odd Divisor math, number theory	900	x54892
313A	Ilya and Bank Account implementation, number theory	900	x53439
1370A	Maximum GCD greedy, implementation, math, number theory	800	x48579
749A	Bachgold Problem greedy, implementation, math, number theory	800	x46325
1520B	Ordinary Numbers brute force, math, number theory	800	x42701
742A	Arpa’s hard exam and Mehrdad’s naive cheat implementation, math, number theory	1000	x39739
1389A	LCM Problem constructive algorithms, greedy, math, number theory	800	x38239
1325A	EhAb AnD gCd constructive algorithms, greedy, number theory	800	x38033
577A	Multiplication Table implementation, number theory	1000	x37965
1899A	Game with Integers games, math, number theory	800	x37362
1521A	Nastia and Nearly Good Numbers constructive algorithms, math, number theory	1000	x35240
1294C	Product of Three Numbers greedy, math, number theory	1300	x32183
822A	I'm bored with life implementation, math, number theory	800	x31616
1549A	Gregor and Cryptography math, number theory	800	x31273
766B	Mahmoud and a Triangle constructive algorithms, geometry, greedy, math, number theory, sortings	1000	x31017
1360D	Buying Shovels math, number theory	1300	x30682
1553A	Digits Sum math, number theory	800	x30068
1473B	String LCM brute force, math, number theory, strings	1000	x29609
1933B	Turtle Math: Fast Three Task implementation, math, number theory	800	x29593
1535B	Array Reodering brute force, greedy, math, number theory, sortings	900	x29530
1326A	Bad Ugly Numbers constructive algorithms, number theory	1000	x29343
1859A	United We Stand constructive algorithms, math, number theory	800	x29096
1526B	I Hate 1111 dp, math, number theory	1400	x28572
26A	Almost Prime number theory	900	x28434
1768A	Greatest Convex greedy, math, number theory	800	x27924
919B	Perfect Number binary search, brute force, dp, implementation, number theory	1100	x26795
1364A	XXXXX brute force, data structures, number theory, two pointers	1200	x26741
1541B	Pleasant Pairs brute force, implementation, math, number theory	1200	x26389
1543A	Exciting Bets greedy, math, number theory	900	x26294
1474B	Different Divisors binary search, constructive algorithms, greedy, math, number theory	1000	x26241
1372B	Omkar and Last Class of Math greedy, math, number theory	1300	x26076
1455A	Strange Functions math, number theory	800	x25983
1312A	Two Regular Polygons geometry, greedy, math, number theory	800	x25297
1324A	Yet Another Tetris Problem implementation, number theory	900	x25256
1525A	Potion-making math, number theory	800	x25043
199A	Hexadecimal's theorem brute force, constructive algorithms, implementation, number theory	900	x25013
1388A	Captain Flint and Crew Recruitment brute force, greedy, math, number theory	800	x24527
1916A	2023 constructive algorithms, implementation, math, number theory	800	x24448
1845A	Forbidden Integer constructive algorithms, implementation, math, number theory	800	x24432
1471A	Strange Partition greedy, math, number theory	900	x24422
1515B	Phoenix and Puzzle brute force, geometry, math, number theory	1000	x24088
1514A	Perfectly Imperfect Array math, number theory	800	x23768
1855B	Longest Divisors Interval brute force, combinatorics, greedy, math, number theory	900	x23602
1370C	Number Game games, math, number theory	1400	x23492
1916B	Two Divisors constructive algorithms, math, number theory	1000	x23486
1401C	Mere Array constructive algorithms, math, number theory, sortings	1300	x23396
1238A	Prime Subtraction math, number theory	900	x23234
1370B	GCD Compression constructive algorithms, math, number theory	1100	x23061
1629B	GCD Arrays greedy, math, number theory	800	x22945
1409C	Yet Another Array Restoration brute force, math, number theory	1200	x22715
1617B	GCD Problem brute force, constructive algorithms, math, number theory	900	x22354
1108B	Divisors of Two Integers brute force, greedy, math, number theory	1100	x22350
483A	Counterexample brute force, implementation, math, number theory	1100	x22140
1542B	Plus and Multiply constructive algorithms, math, number theory	1500	x22000
1511B	GCD Length constructive algorithms, math, number theory	1100	x21927
1285C	Fadi and LCM brute force, math, number theory	1400	x21902
1858C	Yet Another Permutation Problem constructive algorithms, greedy, math, number theory	1000	x21875
1872C	Non-coprime Split math, number theory	1100	x21853
1679A	AvtoBus brute force, greedy, math, number theory	900	x21752
1720A	Burenka Plays with Fractions math, number theory	900	x21700
1742D	Coprime brute force, greedy, number theory	1100	x21481
1712B	Woeful Permutation constructive algorithms, greedy, number theory	800	x21213
414B	Mashmokh and ACM combinatorics, dp, number theory	1400	x20758
1485A	Add and Divide brute force, greedy, math, number theory	1000	x20753
1521B	Nastia and a Good Array constructive algorithms, math, number theory	1300	x20718
1350B	Orac and Models dp, math, number theory	1400	x20532
1828B	Permutation Swap math, number theory	900	x20528
682A	Alyona and Numbers constructive algorithms, math, number theory	1100	x20420
1605A	A.M. Deviation math, number theory	800	x20317
1933C	Turtle Fingers: Count the Values of k brute force, implementation, math, number theory	1100	x20236
1454D	Number into Sequence constructive algorithms, math, number theory	1300	x19696
1487B	Cat Cycle math, number theory	1200	x19585
1740A	Factorise N+M constructive algorithms, number theory	800	x19574
1950D	Product of Binary Decimals brute force, dp, implementation, number theory	1100	x19546
1593D1	All are Same math, number theory	1100	x19538
519C	A and B and Team Training greedy, implementation, math, number theory	1300	x19316
776B	Sherlock and his girlfriend constructive algorithms, number theory	1200	x19244
1945B	Fireworks math, number theory	900	x19161
1562B	Scenes From a Memory brute force, constructive algorithms, implementation, math, number theory	1000	x19154
1717A	Madoka and Strange Thoughts math, number theory	800	x19103
1762A	Divide and Conquer greedy, math, number theory	800	x18504
1656C	Make Equal With Mod constructive algorithms, math, number theory, sortings	1200	x18449
1658B	Marin and Anti-coprime Permutation combinatorics, math, number theory	800	x18346
1538F	Interesting Function binary search, dp, math, number theory	1500	x18291
1932B	Chaya Calendar number theory	1100	x18169
1925B	A Balanced Problemset? brute force, greedy, math, number theory	1200	x18087
1899B	250 Thousand Tons of TNT brute force, implementation, number theory	1100	x17946
762A	k-th divisor math, number theory	1400	x17886
1411B	Fair Numbers brute force, number theory	1000	x17723
1933D	Turtle Tenacity: Continual Mods constructive algorithms, greedy, math, number theory, sortings	1200	x17514
755A	PolandBall and Hypothesis brute force, graphs, math, number theory	800	x17501
664A	Complicated GCD math, number theory	800	x17376
1736B	Playing with GCD math, number theory	1200	x17217
1810B	Candies constructive algorithms, math, number theory	800	x17118
1332B	Composite Coloring brute force, constructive algorithms, greedy, math, number theory	1400	x17015
1850F	We Were Both Children brute force, implementation, math, number theory	1300	x16988

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