Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round (Div. 2)
5 days
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

number theory

Add tag

Problems

#	Name
1617B	GCD Problem brute force, constructive algorithms, math, number theory	900	x22763
1614D2	Divan and Kostomuksha (hard version) dp, number theory	2300	x2219
1614D1	Divan and Kostomuksha (easy version) dp, number theory	2100	x3706
1612D	X-Magic Pair math, number theory	1600	x8942
1610D	Not Quite Lee combinatorics, dp, math, number theory	2000	x2632
1609C	Complex Market Analysis binary search, dp, implementation, number theory, schedules, two pointers	1400	x9588
1609A	Divide and Multiply greedy, implementation, math, number theory	900	x16855
1608D	Dominoes combinatorics, fft, graphs, math, number theory	2400	x1358
1606C	Banknotes greedy, number theory	1400	x13899
1605E	Array Equalizer binary search, greedy, implementation, math, number theory, sortings, two pointers	2400	x1011
1605A	A.M. Deviation math, number theory	800	x20421
1603D	Artistic Partition divide and conquer, dp, number theory	3000	x626
1603C	Extreme Extension dp, greedy, math, number theory	2300	x1996
1603B	Moderate Modular Mode constructive algorithms, math, number theory	1600	x13231
1603A	Di-visible Confusion constructive algorithms, math, number theory	1300	x16343
1601A	Array Elimination bitmasks, greedy, math, number theory	1300	x13709
1593D2	Half of Same brute force, math, number theory	1900	x4869
1593D1	All are Same math, number theory	1100	x19786
1592D	Hemose in ICPC ? binary search, dfs and similar, implementation, interactive, math, number theory, trees	2300	x2186
1583A	Windblume Ode math, number theory	800	x13643
1582G	Kuzya and Homework data structures, number theory	2600	x569
1581A	CQXYM Count Permutations combinatorics, math, number theory	800	x13323
1579F	Array Stabilization (AND version) brute force, graphs, math, number theory, shortest paths	1700	x4649
1575G	GCD Festival math, number theory	2200	x656
1575C	Cyclic Sum data structures, fft, number theory	3000	x159
1566H	Xor-quiz constructive algorithms, dp, interactive, math, number theory	3200	x127
1562F	Tubular Bells interactive, math, number theory, probabilities	2900	x386
1562B	Scenes From a Memory brute force, constructive algorithms, implementation, math, number theory	1000	x19298
1561D1	Up the Strip (simplified version) brute force, data structures, dp, math, number theory	1700	x5500
1559E	Mocha and Stars combinatorics, dp, fft, math, number theory	2200	x2244
1558B	Up the Strip brute force, dp, math, number theory, two pointers	1900	x4687
1554E	You dfs and similar, dp, math, number theory	2600	x1192
1553G	Common Divisor Graph brute force, constructive algorithms, dsu, graphs, hashing, math, number theory	2700	x986
1553A	Digits Sum math, number theory	800	x30489
1552H	Guess the Perimeter binary search, interactive, number theory	3300	x329
1549A	Gregor and Cryptography math, number theory	800	x31826
1548D2	Gregor and the Odd Cows (Hard) brute force, geometry, math, number theory	3300	x240
1548D1	Gregor and the Odd Cows (Easy) bitmasks, geometry, math, number theory	2300	x1438
1548B	Integers Have Friends binary search, data structures, divide and conquer, math, number theory, two pointers	1800	x9484
1547F	Array Stabilization (GCD version) binary search, brute force, data structures, divide and conquer, number theory, two pointers	1900	x5645
1543A	Exciting Bets greedy, math, number theory	900	x27043
1542C	Strange Function math, number theory	1600	x13764
1542B	Plus and Multiply constructive algorithms, math, number theory	1500	x22415
1541B	Pleasant Pairs brute force, implementation, math, number theory	1200	x27176
1538F	Interesting Function binary search, dp, math, number theory	1500	x18707
1538D	Another Problem About Dividing Numbers constructive algorithms, math, number theory	1700	x13282
1537D	Deleting Divisors games, math, number theory	1700	x12005
1536C	Diluc and Kaeya data structures, dp, hashing, number theory	1500	x13781
1535B	Array Reodering brute force, greedy, math, number theory, sortings	900	x29941
1526B	I Hate 1111 dp, math, number theory	1400	x29450
1525A	Potion-making math, number theory	800	x25177
1521B	Nastia and a Good Array constructive algorithms, math, number theory	1300	x21003
1521A	Nastia and Nearly Good Numbers constructive algorithms, math, number theory	1000	x36014
1520B	Ordinary Numbers brute force, math, number theory	800	x43483
1519C	Berland Regional brute force, data structures, greedy, number theory, sortings	1400	x16331
1516D	Cut binary search, data structures, dp, graphs, number theory, two pointers	2100	x4156
1515G	Phoenix and Odometers dfs and similar, graphs, math, number theory	2700	x964
1515B	Phoenix and Puzzle brute force, geometry, math, number theory	1000	x24457
1514C	Product 1 Modulo N greedy, number theory	1600	x14599
1514A	Perfectly Imperfect Array math, number theory	800	x23907
1513D	GCD and MST constructive algorithms, dsu, graphs, greedy, number theory, sortings	2000	x5148
1512G	Short Task brute force, dp, math, number theory	1700	x7948
1511B	GCD Length constructive algorithms, math, number theory	1100	x22222
1510D	Digits dp, math, number theory	2100	x1812
1505D	Xenolith? Hippodrome? *special problem, number theory	1800	x749
1505B	DMCA *special problem, implementation, number theory	1600	x6041
1500B	Two chandeliers binary search, brute force, chinese remainder theorem, math, number theory	2200	x2012
1499D	The Number of Pairs dp, math, number theory	2100	x5588
1497E2	Square-free division (hard version) data structures, dp, greedy, math, number theory, two pointers	2500	x1581
1497E1	Square-Free Division (easy version) data structures, dp, greedy, math, number theory, two pointers	1700	x8114
1497D	Genius bitmasks, dp, graphs, number theory	2500	x1500
1493F	Enchanted Matrix bitmasks, interactive, number theory	2600	x382
1493D	GCD of an Array brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers	2100	x4807
1491E	Fib-tree brute force, dfs and similar, divide and conquer, number theory, trees	2400	x2069
1488G	Painting Numbers *special problem, data structures, greedy, number theory	2500	x121
1487D	Pythagorean Triples binary search, brute force, math, number theory	1500	x17336
1487B	Cat Cycle math, number theory	1200	x20146
1485D	Multiples and Power Differences constructive algorithms, graphs, math, number theory	2200	x4984
1485C	Floor and Mod binary search, brute force, math, number theory	1700	x9679
1485A	Add and Divide brute force, greedy, math, number theory	1000	x21425
1479E	School Clubs dp, fft, math, number theory, probabilities	3500	x199
1477A	Nezzar and Board constructive algorithms, math, number theory	1800	x5735
1475G	Strange Beauty dp, math, number theory, sortings	1900	x6552
1475A	Odd Divisor math, number theory	900	x57243
1474B	Different Divisors binary search, constructive algorithms, greedy, math, number theory	1000	x27278
1473B	String LCM brute force, math, number theory, strings	1000	x30469
1471A	Strange Partition greedy, math, number theory	900	x25128
1470B	Strange Definition bitmasks, graphs, hashing, math, number theory	1900	x6230
1469D	Ceil Divisions brute force, constructive algorithms, math, number theory	1700	x9224
1468L	Prime Divisors Selection binary search, greedy, math, number theory	2700	x317
1468F	Full Turn geometry, hashing, number theory	1700	x3627
1462D	Add to Neighbour and Remove greedy, math, number theory	1400	x16412
1458A	Row GCD math, number theory	1600	x16726
1455A	Strange Functions math, number theory	800	x26155
1454D	Number into Sequence constructive algorithms, math, number theory	1300	x19928
1444A	Division brute force, math, number theory	1500	x12708
1436F	Sum Over Subsets combinatorics, math, number theory	2800	x510
1427E	Xum bitmasks, constructive algorithms, math, matrices, number theory	2500	x1279
1423K	Lonely Numbers binary search, math, number theory, two pointers	1600	x4721
1422F	Boring Queries data structures, math, number theory	2700	x981