Problemset - Codeforces

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Codeforces Round 945 (Div. 2)
2 days
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number theory

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Problems

#	Name
1603B	Moderate Modular Mode constructive algorithms, math, number theory	1600	x13076
1603A	Di-visible Confusion constructive algorithms, math, number theory	1300	x16150
1601A	Array Elimination bitmasks, greedy, math, number theory	1300	x13275
1593D2	Half of Same brute force, math, number theory	1900	x4797
1593D1	All are Same math, number theory	1100	x19588
1592D	Hemose in ICPC ? binary search, dfs and similar, implementation, interactive, math, number theory, trees	2300	x2162
1583A	Windblume Ode math, number theory	800	x13533
1582G	Kuzya and Homework data structures, number theory	2600	x561
1581A	CQXYM Count Permutations combinatorics, math, number theory	800	x13260
1579F	Array Stabilization (AND version) brute force, graphs, math, number theory, shortest paths	1700	x4568
1575G	GCD Festival math, number theory	2200	x641
1575C	Cyclic Sum data structures, fft, number theory	3000	x155
1566H	Xor-quiz constructive algorithms, dp, interactive, math, number theory	3200	x122
1562F	Tubular Bells interactive, math, number theory, probabilities	2900	x373
1562B	Scenes From a Memory brute force, constructive algorithms, implementation, math, number theory	1000	x19184
1561D1	Up the Strip (simplified version) brute force, data structures, dp, math, number theory	1700	x5394
1559E	Mocha and Stars combinatorics, dp, fft, math, number theory	2200	x2216
1558B	Up the Strip brute force, dp, math, number theory, two pointers	1900	x4616
1554E	You dfs and similar, dp, math, number theory	2600	x1180
1553G	Common Divisor Graph brute force, constructive algorithms, dsu, graphs, hashing, math, number theory	2700	x975
1553A	Digits Sum math, number theory	800	x30174
1552H	Guess the Perimeter binary search, interactive, number theory	3300	x316
1549A	Gregor and Cryptography math, number theory	800	x31371
1548D2	Gregor and the Odd Cows (Hard) brute force, geometry, math, number theory	3300	x238
1548D1	Gregor and the Odd Cows (Easy) bitmasks, geometry, math, number theory	2300	x1428
1548B	Integers Have Friends binary search, data structures, divide and conquer, math, number theory, two pointers	1800	x9313
1547F	Array Stabilization (GCD version) binary search, brute force, data structures, divide and conquer, number theory, two pointers	1900	x5513
1543A	Exciting Bets greedy, math, number theory	900	x26449
1542C	Strange Function math, number theory	1600	x13539
1542B	Plus and Multiply constructive algorithms, math, number theory	1500	x22101
1541B	Pleasant Pairs brute force, implementation, math, number theory	1200	x26547
1538F	Interesting Function binary search, dp, math, number theory	1500	x18374
1538D	Another Problem About Dividing Numbers constructive algorithms, math, number theory	1700	x13074
1537D	Deleting Divisors games, math, number theory	1700	x11874
1536C	Diluc and Kaeya data structures, dp, hashing, number theory	1500	x13574
1535B	Array Reodering brute force, greedy, math, number theory, sortings	900	x29634
1526B	I Hate 1111 dp, math, number theory	1400	x28759
1525A	Potion-making math, number theory	800	x25075
1521B	Nastia and a Good Array constructive algorithms, math, number theory	1300	x20782
1521A	Nastia and Nearly Good Numbers constructive algorithms, math, number theory	1000	x35370
1520B	Ordinary Numbers brute force, math, number theory	800	x42919
1519C	Berland Regional brute force, data structures, greedy, number theory, sortings	1400	x15998
1516D	Cut binary search, data structures, dp, graphs, number theory, two pointers	2100	x4097
1515G	Phoenix and Odometers dfs and similar, graphs, math, number theory	2700	x937
1515B	Phoenix and Puzzle brute force, geometry, math, number theory	1000	x24179
1514C	Product 1 Modulo N greedy, number theory	1600	x14330
1514A	Perfectly Imperfect Array math, number theory	800	x23805
1513D	GCD and MST constructive algorithms, dsu, graphs, greedy, number theory, sortings	2000	x5053
1512G	Short Task brute force, dp, math, number theory	1700	x7813
1511B	GCD Length constructive algorithms, math, number theory	1100	x21985
1510D	Digits dp, math, number theory	2100	x1801
1505D	Xenolith? Hippodrome? *special problem, number theory	1800	x739
1505B	DMCA *special problem, implementation, number theory	1600	x6005
1500B	Two chandeliers binary search, brute force, chinese remainder theorem, math, number theory	2200	x1986
1499D	The Number of Pairs dp, math, number theory	2100	x5472
1497E2	Square-free division (hard version) data structures, dp, greedy, math, number theory, two pointers	2500	x1566
1497E1	Square-Free Division (easy version) data structures, dp, greedy, math, number theory, two pointers	1700	x8041
1497D	Genius bitmasks, dp, graphs, number theory	2500	x1483
1493F	Enchanted Matrix bitmasks, interactive, number theory	2600	x375
1493D	GCD of an Array brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers	2100	x4746
1491E	Fib-tree brute force, dfs and similar, divide and conquer, number theory, trees	2400	x2043
1488G	Painting Numbers *special problem, data structures, greedy, number theory	2500	x117
1487D	Pythagorean Triples binary search, brute force, math, number theory	1500	x17069
1487B	Cat Cycle math, number theory	1200	x19690
1485D	Multiples and Power Differences constructive algorithms, graphs, math, number theory	2200	x4942
1485C	Floor and Mod binary search, brute force, math, number theory	1700	x9532
1485A	Add and Divide brute force, greedy, math, number theory	1000	x20849
1479E	School Clubs dp, fft, math, number theory, probabilities	3500	x188
1477A	Nezzar and Board constructive algorithms, math, number theory	1800	x5682
1475G	Strange Beauty dp, math, number theory, sortings	1900	x6417
1475A	Odd Divisor math, number theory	900	x55405
1474B	Different Divisors binary search, constructive algorithms, greedy, math, number theory	1000	x26410
1473B	String LCM brute force, math, number theory, strings	1000	x29729
1471A	Strange Partition greedy, math, number theory	900	x24572
1470B	Strange Definition bitmasks, graphs, hashing, math, number theory	1900	x6153
1469D	Ceil Divisions brute force, constructive algorithms, math, number theory	1700	x9162
1468L	Prime Divisors Selection binary search, greedy, math, number theory	2700	x313
1468F	Full Turn geometry, hashing, number theory	1700	x3591
1462D	Add to Neighbour and Remove greedy, math, number theory	1400	x16243
1458A	Row GCD math, number theory	1600	x16007
1455A	Strange Functions math, number theory	800	x26042
1454D	Number into Sequence constructive algorithms, math, number theory	1300	x19761
1444A	Division brute force, math, number theory	1500	x12572
1436F	Sum Over Subsets combinatorics, math, number theory	2800	x500
1427E	Xum bitmasks, constructive algorithms, math, matrices, number theory	2500	x1266
1423K	Lonely Numbers binary search, math, number theory, two pointers	1600	x4678
1422F	Boring Queries data structures, math, number theory	2700	x971
1419E	Decryption constructive algorithms, implementation, math, number theory	2100	x3141
1418F	Equal Product data structures, math, number theory, two pointers	3000	x356
1411B	Fair Numbers brute force, number theory	1000	x17843
1409C	Yet Another Array Restoration brute force, math, number theory	1200	x22754
1407B	Big Vova brute force, greedy, math, number theory	1300	x16688
1406E	Deleting Numbers interactive, math, number theory	2600	x1552
1404D	Game of Pairs constructive algorithms, dfs and similar, interactive, math, number theory	2800	x983
1401D	Maximum Distributed Tree dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees	1800	x8866
1401C	Mere Array constructive algorithms, math, number theory, sortings	1300	x23456
1398G	Running Competition bitmasks, fft, math, number theory	2600	x773
1397B	Power Sequence brute force, math, number theory, sortings	1500	x14361
1396A	Multiples of Length constructive algorithms, greedy, number theory	1600	x14971
1389E	Calendar Ambiguity math, number theory	2200	x3113