Problemset - Codeforces

Please read the new rule regarding the restriction on the use of AI tools. ×

→ Pay attention

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

*has extra registration

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
1633F	Perfect Matching data structures, divide and conquer, interactive, trees	2800	x318
1633E	Spanning Tree Queries binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees	2400	x1526
1633D	Make Them Equal dp, greedy	1600	x14031
1633C	Kill the Monster brute force, math	1100	x20050
1633B	Minority greedy	800	x27774
1633A	Div. 7 brute force	800	x33008
1632E2	Distance Tree (hard version) binary search, dfs and similar, shortest paths, trees	2700	x980
1632E1	Distance Tree (easy version) binary search, data structures, dfs and similar, graphs, shortest paths, trees	2400	x1161
1632D	New Year Concert binary search, data structures, greedy, math, number theory, two pointers	2000	x4665
1632C	Strange Test binary search, bitmasks, brute force, dp, math	1600	x12721
1632B	Roof Construction bitmasks, constructive algorithms	1000	x22266
1632A	ABC implementation	800	x29455
1631B	Fun with Even Subarrays dp, greedy	1100	x20336
1631A	Min Max Swap greedy	800	x29067
1630F	Making It Bipartite flows, graph matchings, graphs, number theory	3400	x571
1630E	Expected Components combinatorics, math, number theory, probabilities	2900	x437
1630D	Flipping Range constructive algorithms, dp, greedy, number theory	2400	x1636
1630C	Paint the Middle dp, greedy, sortings, two pointers	2200	x2939
1630B	Range and Partition binary search, constructive algorithms, data structures, greedy, two pointers	1800	x5741
1630A	And Matching bitmasks, constructive algorithms	1500	x14529
1629B	GCD Arrays greedy, math, number theory	800	x23401
1629A	Download More RAM brute force, greedy, sortings	800	x29001
1628F	Spaceship Crisis Management binary search, data structures, geometry, sortings	3500	x88
1628E	Groceries in Meteor Town binary search, data structures, dsu, trees	3100	x883
1628D2	Game on Sum (Hard Version) combinatorics, dp, games, math	2400	x2062
1628D1	Game on Sum (Easy Version) combinatorics, dp, games, math	2100	x3145
1628C	Grid Xor constructive algorithms, greedy, implementation, interactive, math	2300	x3182
1628B	Peculiar Movie Preferences greedy, strings	1700	x11599
1628A	Meximum Array binary search, constructive algorithms, greedy, implementation, math, two pointers	1400	x15607
1627F	Not Splitting geometry, graphs, greedy, implementation, shortest paths	2700	x587
1627E	Not Escaping data structures, dp, implementation, shortest paths, two pointers	2200	x2374
1627D	Not Adding brute force, dp, math, number theory	1900	x8274
1627C	Not Assigning constructive algorithms, dfs and similar, number theory, trees	1400	x14521
1627B	Not Sitting games, greedy, sortings	1300	x16626
1627A	Not Shading constructive algorithms, implementation	800	x24013
1626F	A Random Code Problem combinatorics, dp, math, number theory, probabilities	2800	x732
1626E	Black and White Tree dfs and similar, greedy, trees	2400	x1574
1626D	Martial Arts Tournament binary search, brute force, greedy, math	2100	x3918
1626C	Monsters And Spells binary search, data structures, dp, greedy, implementation, math, two pointers	1700	x10905
1626B	Minor Reduction greedy, strings	1100	x22803
1626A	Equidistant Letters constructive algorithms, sortings	800	x28757
1625E2	Cats on the Upgrade (hard version) binary search, data structures, dfs and similar, graphs, trees	2800	x594
1625E1	Cats on the Upgrade (easy version) brute force, data structures, dfs and similar, divide and conquer, dp, graphs, trees	2500	x1041
1625D	Binary Spiders bitmasks, data structures, implementation, math, sortings, trees	2300	x2052
1625C	Road Optimization dp	1700	x10625
1625B	Elementary Particles brute force, greedy, sortings	1100	x16082
1625A	Ancient Civilization bitmasks, greedy, math	800	x17213
1624G	MinOr Tree bitmasks, dfs and similar, dsu, graphs, greedy	1900	x5914
1624F	Interacdive Problem binary search, constructive algorithms, interactive	2000	x3302
1624E	Masha-forgetful brute force, constructive algorithms, dp, hashing, implementation, strings	2000	x4095
1624D	Palindromes Coloring binary search, greedy, sortings, strings	1400	x16984
1624C	Division by Two and Permutation constructive algorithms, flows, graph matchings, greedy, math	1100	x24819
1624B	Make AP implementation, math	900	x36669
1624A	Plus One on the Subset math	800	x51770
1623E	Middle Duplication data structures, dfs and similar, greedy, strings, trees	2500	x1097
1623D	Robot Cleaner Revisit implementation, math, probabilities	2300	x1376
1623C	Balanced Stone Heaps binary search, greedy	1600	x12122
1623B	Game on Ranges brute force, dfs and similar, implementation, sortings	1100	x14084
1623A	Robot Cleaner brute force, implementation, math	800	x20029
1622F	Quadratic Set constructive algorithms, hashing, math, number theory	2900	x655
1622E	Math Test bitmasks, brute force, greedy	2200	x1896
1622D	Shuffle combinatorics, math, two pointers	2000	x4050
1622C	Set or Decrease binary search, brute force, greedy, sortings	1600	x13063
1622B	Berland Music data structures, greedy, math, sortings	1000	x20924
1622A	Construct a Rectangle geometry, math	800	x30037
1621I	Two Sequences data structures, hashing, string suffix structures	3500	x117
1621H	Trains and Airplanes dfs and similar, graphs, shortest paths, trees	3500	x179
1621G	Weighted Increasing Subsequences data structures, dp, math	3200	x650
1621F	Strange Instructions data structures, greedy, implementation	2700	x552
1621E	New School binary search, data structures, dp, greedy, implementation, sortings	2300	x1757
1621D	The Winter Hike constructive algorithms, greedy, math	2100	x4062
1621C	Hidden Permutations dfs and similar, interactive, math	1700	x6898
1621B	Integers Shop data structures, greedy, implementation	1500	x13403
1621A	Stable Arrangement of Rooks constructive algorithms	800	x23784
1620G	Subsequences Galore bitmasks, combinatorics, dp	2400	x896
1620F	Bipartite Array dp, greedy	2800	x608
1620E	Replace the Numbers constructive algorithms, data structures, dsu, implementation	1900	x8254
1620D	Exact Change brute force, constructive algorithms, greedy	2000	x4192
1620C	BA-String brute force, dp, greedy, implementation, math	1800	x6565
1620B	Triangles on a Rectangle geometry, greedy, math	1000	x21125
1620A	Equal or Not Equal constructive algorithms, dsu, implementation	800	x21570
1619H	Permutation and Queries brute force, data structures, divide and conquer, two pointers	2400	x1141
1619G	Unusual Minesweeper binary search, dfs and similar, dsu, greedy, sortings	2000	x2400
1619F	Let's Play the Hat? brute force, constructive algorithms, greedy, math	2000	x2095
1619E	MEX and Increments constructive algorithms, data structures, dp, greedy, implementation, math, sortings	1700	x9163
1619D	New Year's Problem binary search, greedy, sortings	1800	x7536
1619C	Wrong Addition implementation	1200	x20945
1619B	Squares and Cubes implementation, math	800	x30738
1619A	Square String? implementation, strings	800	x51415
1618G	Trader Problem data structures, dsu, greedy, sortings	2200	x1568
1618F	Reverse bitmasks, constructive algorithms, dfs and similar, implementation, math, strings	2000	x4204
1618E	Singers' Tour constructive algorithms, math	1700	x7169
1618D	Array and Operations dp, greedy, math	1300	x18907
1618C	Paint the Array math	1100	x22999
1618B	Missing Bigram implementation	800	x22612
1618A	Polycarp and Sums of Subsequences math, sortings	800	x32264
1617E	Christmas Chocolates dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees	2700	x869
1617D2	Too Many Impostors (hard version) constructive algorithms, implementation, interactive, math	2400	x1787
1617D1	Too Many Impostors (easy version) constructive algorithms, implementation, interactive	1800	x4678
1617C	Paprika and Permutation binary search, greedy, math, sortings	1300	x14976