Problemset - Codeforces

→ Pay attention

Before contest
CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
09:27:30
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

math

Add tag

Problems

#	Name
1661C	Water the Trees binary search, greedy, math	1700	x9439
1661A	Array Balancing greedy, math	800	x18424
1660F2	Promising String (hard version) data structures, implementation, math, strings	2100	x2751
1660F1	Promising String (easy version) brute force, implementation, math, strings	1700	x7331
1660D	Maximum Product Strikes Back brute force, implementation, math, two pointers	1600	x8755
1660B	Vlad and Candies math	800	x28197
1660A	Vasya and Coins greedy, math	800	x36262
1659D	Reverse Sort Sum constructive algorithms, data structures, greedy, implementation, math, two pointers	1900	x4041
1659C	Line Empire binary search, brute force, dp, greedy, implementation, math	1500	x10693
1659A	Red Versus Blue constructive algorithms, greedy, implementation, math	1000	x19225
1658F	Juju and Binary String brute force, constructive algorithms, greedy, math	2700	x774
1658E	Gojou and Matrix Game data structures, dp, games, hashing, implementation, math, number theory, sortings	2500	x1060
1658D2	388535 (Hard Version) bitmasks, brute force, data structures, math	2300	x2590
1658D1	388535 (Easy Version) bitmasks, math	1600	x9164
1658C	Shinju and the Lost Permutation constructive algorithms, math	1700	x9391
1658B	Marin and Anti-coprime Permutation combinatorics, math, number theory	800	x18664
1658A	Marin and Photoshoot constructive algorithms, implementation, math	800	x20375
1657E	Star MST combinatorics, dp, graph matchings, math	2200	x2139
1657D	For Gamers. By Gamers. binary search, brute force, greedy, math, sortings	2000	x4931
1657A	Integer Moves brute force, math	800	x24042
1656H	Equal LCM Subsets data structures, math, number theory	3200	x595
1656G	Cycle Palindrome constructive algorithms, graphs, math	3200	x386
1656F	Parametric MST binary search, constructive algorithms, graphs, greedy, math, sortings	2600	x1072
1656E	Equal Tree Sums constructive algorithms, dfs and similar, math, trees	2200	x3494
1656D	K-good constructive algorithms, math, number theory	1900	x6925
1656C	Make Equal With Mod constructive algorithms, math, number theory, sortings	1200	x19333
1656B	Subtract Operation data structures, greedy, math, two pointers	1100	x19270
1656A	Good Pairs math, sortings	800	x19722
1654H	Three Minimums combinatorics, constructive algorithms, divide and conquer, dp, fft, math	3500	x80
1654E	Arithmetic Operations brute force, data structures, graphs, math	2300	x2106
1654D	Potion Brewing Class dfs and similar, math, number theory, trees	2100	x2866
1651E	Sum of Matchings brute force, combinatorics, constructive algorithms, dfs and similar, graph matchings, greedy, math	2600	x524
1650E	Rescheduling the Exam binary search, data structures, greedy, implementation, math, sortings	1900	x4174
1650D	Twist the Permutation brute force, constructive algorithms, implementation, math	1300	x13107
1650B	DIV + MOD math	900	x27844
1648B	Integral Array brute force, constructive algorithms, data structures, math	1800	x6488
1648A	Weird Sum combinatorics, data structures, geometry, math, matrices, sortings	1400	x13149
1647D	Madoka and the Best School in Russia constructive algorithms, dp, math, number theory	1900	x5325
1647A	Madoka and Math Dad implementation, math	800	x22837
1646E	Power Board brute force, dp, math, number theory	2200	x2482
1646C	Factorials and Powers of Two bitmasks, brute force, constructive algorithms, dp, math	1500	x14343
1646A	Square Counting math	800	x24362
1644F	Basis combinatorics, fft, math, number theory	2900	x329
1644E	Expand the Path brute force, combinatorics, data structures, implementation, math	1900	x3125
1644D	Cross Coloring data structures, implementation, math	1700	x7308
1641E	Special Positions combinatorics, divide and conquer, fft, math	3300	x210
1641D	Two Arrays bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers	2700	x1189
1638C	Inversion Graph data structures, dsu, graphs, math	1300	x14768
1638B	Odd Swap Sort data structures, math, sortings	1100	x20977
1638A	Reverse constructive algorithms, greedy, math	800	x21518
1637H	Minimize Inversions Number data structures, greedy, math, sortings	3500	x326
1637G	Birthday constructive algorithms, greedy, math	3000	x519
1637D	Yet Another Minimization Problem dp, greedy, math	1800	x7820
1637B	MEX and Array brute force, dp, greedy, math	1100	x14873
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x6306
1634F	Fibonacci Additions brute force, data structures, hashing, implementation, math	2700	x1616
1634D	Finding Zero constructive algorithms, interactive, math	2000	x4412
1634B	Fortune Telling bitmasks, math	1400	x16841
1633E	Spanning Tree Queries binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees	2400	x1554
1633C	Kill the Monster brute force, math	1100	x20142
1632D	New Year Concert binary search, data structures, greedy, math, number theory, two pointers	2000	x4738
1632C	Strange Test binary search, bitmasks, brute force, dp, math	1600	x12824
1630E	Expected Components combinatorics, math, number theory, probabilities	2900	x443
1629B	GCD Arrays greedy, math, number theory	800	x23567
1628D2	Game on Sum (Hard Version) combinatorics, dp, games, math	2400	x2169
1628D1	Game on Sum (Easy Version) combinatorics, dp, games, math	2100	x3229
1628C	Grid Xor constructive algorithms, greedy, implementation, interactive, math	2300	x3213
1628A	Meximum Array binary search, constructive algorithms, greedy, implementation, math, two pointers	1400	x15743
1627D	Not Adding brute force, dp, math, number theory	1900	x8382
1626F	A Random Code Problem combinatorics, dp, math, number theory, probabilities	2800	x738
1626D	Martial Arts Tournament binary search, brute force, greedy, math	2100	x3938
1626C	Monsters And Spells binary search, data structures, dp, greedy, implementation, math, two pointers	1700	x10987
1625D	Binary Spiders bitmasks, data structures, implementation, math, sortings, trees	2300	x2071
1625A	Ancient Civilization bitmasks, greedy, math	800	x17297
1624C	Division by Two and Permutation constructive algorithms, flows, graph matchings, greedy, math	1100	x25000
1624B	Make AP implementation, math	900	x37479
1624A	Plus One on the Subset math	800	x52636
1623D	Robot Cleaner Revisit implementation, math, probabilities	2300	x1387
1623A	Robot Cleaner brute force, implementation, math	800	x20090
1622F	Quadratic Set constructive algorithms, hashing, math, number theory	2900	x676
1622D	Shuffle combinatorics, math, two pointers	2000	x4136
1622B	Berland Music data structures, greedy, math, sortings	1000	x21168
1622A	Construct a Rectangle geometry, math	800	x30249
1621G	Weighted Increasing Subsequences data structures, dp, math	3200	x657
1621D	The Winter Hike constructive algorithms, greedy, math	2100	x4094
1621C	Hidden Permutations dfs and similar, interactive, math	1700	x6945
1620C	BA-String brute force, dp, greedy, implementation, math	1800	x6617
1620B	Triangles on a Rectangle geometry, greedy, math	1000	x21581
1619F	Let's Play the Hat? brute force, constructive algorithms, greedy, math	2000	x2118
1619E	MEX and Increments constructive algorithms, data structures, dp, greedy, implementation, math, sortings	1700	x9281
1619B	Squares and Cubes implementation, math	800	x31039
1618F	Reverse bitmasks, constructive algorithms, dfs and similar, implementation, math, strings	2000	x4290
1618E	Singers' Tour constructive algorithms, math	1700	x7257
1618D	Array and Operations dp, greedy, math	1300	x19091
1618C	Paint the Array math	1100	x23443
1618A	Polycarp and Sums of Subsequences math, sortings	800	x32502
1617E	Christmas Chocolates dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees	2700	x883
1617D2	Too Many Impostors (hard version) constructive algorithms, implementation, interactive, math	2400	x1805
1617C	Paprika and Permutation binary search, greedy, math, sortings	1300	x15071
1617B	GCD Problem brute force, constructive algorithms, math, number theory	900	x23595