Problemset - Codeforces

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Codeforces Round (Div. 4)
44:37:25
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number theory

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Problems

#	Name
1606C	Banknotes greedy, number theory	1400	x13838
1605E	Array Equalizer binary search, greedy, implementation, math, number theory, sortings, two pointers	2400	x1001
1605A	A.M. Deviation math, number theory	800	x20383
1603D	Artistic Partition divide and conquer, dp, number theory	3000	x618
1603C	Extreme Extension dp, greedy, math, number theory	2300	x1989
1603B	Moderate Modular Mode constructive algorithms, math, number theory	1600	x13146
1603A	Di-visible Confusion constructive algorithms, math, number theory	1300	x16273
1601A	Array Elimination bitmasks, greedy, math, number theory	1300	x13506
1593D2	Half of Same brute force, math, number theory	1900	x4849
1593D1	All are Same math, number theory	1100	x19690
1592D	Hemose in ICPC ? binary search, dfs and similar, implementation, interactive, math, number theory, trees	2300	x2171
1583A	Windblume Ode math, number theory	800	x13571
1582G	Kuzya and Homework data structures, number theory	2600	x566
1581A	CQXYM Count Permutations combinatorics, math, number theory	800	x13306
1579F	Array Stabilization (AND version) brute force, graphs, math, number theory, shortest paths	1700	x4613
1575G	GCD Festival math, number theory	2200	x650
1575C	Cyclic Sum data structures, fft, number theory	3000	x156
1566H	Xor-quiz constructive algorithms, dp, interactive, math, number theory	3200	x126
1562F	Tubular Bells interactive, math, number theory, probabilities	2900	x374
1562B	Scenes From a Memory brute force, constructive algorithms, implementation, math, number theory	1000	x19236
1561D1	Up the Strip (simplified version) brute force, data structures, dp, math, number theory	1700	x5469
1559E	Mocha and Stars combinatorics, dp, fft, math, number theory	2200	x2229
1558B	Up the Strip brute force, dp, math, number theory, two pointers	1900	x4663
1554E	You dfs and similar, dp, math, number theory	2600	x1188
1553G	Common Divisor Graph brute force, constructive algorithms, dsu, graphs, hashing, math, number theory	2700	x982
1553A	Digits Sum math, number theory	800	x30335
1552H	Guess the Perimeter binary search, interactive, number theory	3300	x318
1549A	Gregor and Cryptography math, number theory	800	x31627
1548D2	Gregor and the Odd Cows (Hard) brute force, geometry, math, number theory	3300	x239
1548D1	Gregor and the Odd Cows (Easy) bitmasks, geometry, math, number theory	2300	x1435
1548B	Integers Have Friends binary search, data structures, divide and conquer, math, number theory, two pointers	1800	x9411
1547F	Array Stabilization (GCD version) binary search, brute force, data structures, divide and conquer, number theory, two pointers	1900	x5588
1543A	Exciting Bets greedy, math, number theory	900	x26763
1542C	Strange Function math, number theory	1600	x13654
1542B	Plus and Multiply constructive algorithms, math, number theory	1500	x22264
1541B	Pleasant Pairs brute force, implementation, math, number theory	1200	x26881
1538F	Interesting Function binary search, dp, math, number theory	1500	x18544
1538D	Another Problem About Dividing Numbers constructive algorithms, math, number theory	1700	x13182
1537D	Deleting Divisors games, math, number theory	1700	x11938
1536C	Diluc and Kaeya data structures, dp, hashing, number theory	1500	x13688
1535B	Array Reodering brute force, greedy, math, number theory, sortings	900	x29797
1526B	I Hate 1111 dp, math, number theory	1400	x29149
1525A	Potion-making math, number theory	800	x25121
1521B	Nastia and a Good Array constructive algorithms, math, number theory	1300	x20907
1521A	Nastia and Nearly Good Numbers constructive algorithms, math, number theory	1000	x35728
1520B	Ordinary Numbers brute force, math, number theory	800	x43229
1519C	Berland Regional brute force, data structures, greedy, number theory, sortings	1400	x16170
1516D	Cut binary search, data structures, dp, graphs, number theory, two pointers	2100	x4123
1515G	Phoenix and Odometers dfs and similar, graphs, math, number theory	2700	x953
1515B	Phoenix and Puzzle brute force, geometry, math, number theory	1000	x24308
1514C	Product 1 Modulo N greedy, number theory	1600	x14456
1514A	Perfectly Imperfect Array math, number theory	800	x23861
1513D	GCD and MST constructive algorithms, dsu, graphs, greedy, number theory, sortings	2000	x5099
1512G	Short Task brute force, dp, math, number theory	1700	x7884
1511B	GCD Length constructive algorithms, math, number theory	1100	x22101
1510D	Digits dp, math, number theory	2100	x1806
1505D	Xenolith? Hippodrome? *special problem, number theory	1800	x743
1505B	DMCA *special problem, implementation, number theory	1600	x6025
1500B	Two chandeliers binary search, brute force, chinese remainder theorem, math, number theory	2200	x1998
1499D	The Number of Pairs dp, math, number theory	2100	x5534
1497E2	Square-free division (hard version) data structures, dp, greedy, math, number theory, two pointers	2500	x1573
1497E1	Square-Free Division (easy version) data structures, dp, greedy, math, number theory, two pointers	1700	x8077
1497D	Genius bitmasks, dp, graphs, number theory	2500	x1492
1493F	Enchanted Matrix bitmasks, interactive, number theory	2600	x379
1493D	GCD of an Array brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers	2100	x4776
1491E	Fib-tree brute force, dfs and similar, divide and conquer, number theory, trees	2400	x2062
1488G	Painting Numbers *special problem, data structures, greedy, number theory	2500	x120
1487D	Pythagorean Triples binary search, brute force, math, number theory	1500	x17207
1487B	Cat Cycle math, number theory	1200	x19937
1485D	Multiples and Power Differences constructive algorithms, graphs, math, number theory	2200	x4959
1485C	Floor and Mod binary search, brute force, math, number theory	1700	x9630
1485A	Add and Divide brute force, greedy, math, number theory	1000	x21121
1479E	School Clubs dp, fft, math, number theory, probabilities	3500	x194
1477A	Nezzar and Board constructive algorithms, math, number theory	1800	x5706
1475G	Strange Beauty dp, math, number theory, sortings	1900	x6489
1475A	Odd Divisor math, number theory	900	x56331
1474B	Different Divisors binary search, constructive algorithms, greedy, math, number theory	1000	x26846
1473B	String LCM brute force, math, number theory, strings	1000	x30223
1471A	Strange Partition greedy, math, number theory	900	x24856
1470B	Strange Definition bitmasks, graphs, hashing, math, number theory	1900	x6191
1469D	Ceil Divisions brute force, constructive algorithms, math, number theory	1700	x9199
1468L	Prime Divisors Selection binary search, greedy, math, number theory	2700	x316
1468F	Full Turn geometry, hashing, number theory	1700	x3620
1462D	Add to Neighbour and Remove greedy, math, number theory	1400	x16338
1458A	Row GCD math, number theory	1600	x16408
1455A	Strange Functions math, number theory	800	x26102
1454D	Number into Sequence constructive algorithms, math, number theory	1300	x19853
1444A	Division brute force, math, number theory	1500	x12661
1436F	Sum Over Subsets combinatorics, math, number theory	2800	x503
1427E	Xum bitmasks, constructive algorithms, math, matrices, number theory	2500	x1273
1423K	Lonely Numbers binary search, math, number theory, two pointers	1600	x4699
1422F	Boring Queries data structures, math, number theory	2700	x975
1419E	Decryption constructive algorithms, implementation, math, number theory	2100	x3152
1418F	Equal Product data structures, math, number theory, two pointers	3000	x358
1411B	Fair Numbers brute force, number theory	1000	x18053
1409C	Yet Another Array Restoration brute force, math, number theory	1200	x22839
1407B	Big Vova brute force, greedy, math, number theory	1300	x16722
1406E	Deleting Numbers interactive, math, number theory	2600	x1575
1404D	Game of Pairs constructive algorithms, dfs and similar, interactive, math, number theory	2800	x991
1401D	Maximum Distributed Tree dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees	1800	x8903