Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round (Div. 3)
44:55:26
Register now »

→ Filter Problems

Difficulty: —

math

Add tag

Problems

#	Name
75D	Big Maximum Sum data structures, dp, greedy, implementation, math, trees	2000	x1718
746E	Numbers Exchange greedy, implementation, math	1900	x1709
1617D2	Too Many Impostors (hard version) constructive algorithms, implementation, interactive, math	2400	x1704
1468H	K and Medians constructive algorithms, greedy, math	2200	x1702
1748E	Yet Another Array Counting Problem binary search, data structures, divide and conquer, dp, flows, math, trees	2300	x1696
1158C	Permutation recovery constructive algorithms, data structures, dfs and similar, graphs, greedy, math, sortings	2100	x1696
590B	Chip 'n Dale Rescue Rangers binary search, geometry, math	2100	x1696
1763E	Node Pairs dp, graphs, math, number theory	2200	x1688
1042E	Vasya and Magic Matrix dp, math, probabilities	2300	x1684
979D	Kuro and GCD and XOR and SUM binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees	2200	x1682
920G	List Of Integers binary search, bitmasks, brute force, combinatorics, math, number theory	2200	x1671
916B	Jamie and Binary Sequence (changed after round) bitmasks, greedy, math	2000	x1671
1914G1	Light Bulbs (Easy Version) brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees	2100	x1660
1859E	Maximum Monogonosity brute force, dp, math	2500	x1660
1148E	Earth Wind and Fire constructive algorithms, greedy, math, sortings, two pointers	2300	x1655
76E	Points implementation, math	1700	x1655
1706D2	Chopping Carrots (Hard Version) brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers	2400	x1650
1728E	Red-Black Pepper brute force, data structures, greedy, math, number theory	2300	x1649
362C	Insertion Sort data structures, dp, implementation, math	1900	x1648
1917D	Yet Another Inversions Problem combinatorics, data structures, dp, implementation, math, number theory	2300	x1647
1217E	Sum Queries? data structures, greedy, implementation, math	2300	x1640
1344C	Quantifier Question dfs and similar, dp, graphs, math	2600	x1639
49C	Disposition constructive algorithms, math	1700	x1639
1954E	Chain Reaction binary search, data structures, dsu, greedy, implementation, math, number theory	2200	x1632
997C	Sky Full of Stars combinatorics, math	2500	x1630
575H	Bots combinatorics, dp, math, number theory	1800	x1629
1610E	AmShZ and G.O.A.T. binary search, brute force, greedy, implementation, math	2300	x1626
1909F1	Small Permutation Problem (Easy Version) brute force, combinatorics, dp, math	2200	x1624
81C	Average Score greedy, math, sortings	1700	x1624
819B	Mister B and PR Shifts data structures, implementation, math	1900	x1620
662D	International Olympiad constructive algorithms, greedy, implementation, math	2000	x1616
83B	Doctor binary search, math, sortings	1800	x1615
1811G2	Vlad and the Nice Paths (hard version) binary search, combinatorics, data structures, dp, math, two pointers	2200	x1611
712D	Memory and Scores combinatorics, dp, math	2200	x1611
1929F	Sasha and the Wedding Binary Search Tree brute force, combinatorics, data structures, dfs and similar, math, trees	2300	x1609
1861E	Non-Intersecting Subpermutations combinatorics, dp, implementation, math	2300	x1608
1101G	(Zero XOR Subset)-less math, matrices	2300	x1603
185B	Mushroom Scientists math, ternary search	1800	x1594
229C	Triangles combinatorics, graphs, math	1900	x1591
492E	Vanya and Field math	2000	x1585
992D	Nastya and a Game brute force, implementation, math	2100	x1583
1204E	Natasha, Sasha and the Prefix Sums combinatorics, dp, math, number theory	2300	x1579
612E	Square Root of Permutation combinatorics, constructive algorithms, dfs and similar, graphs, math	2200	x1578
1096F	Inversion Expectation dp, math, probabilities	2300	x1563
1497E2	Square-free division (hard version) data structures, dp, greedy, math, number theory, two pointers	2500	x1561
1411E	Poman Numbers bitmasks, greedy, math, strings	2300	x1554
1175F	The Number of Subpermutations brute force, data structures, divide and conquer, hashing, math	2500	x1554
1599C	Bubble Strike combinatorics, math, probabilities, ternary search	2000	x1550
1406E	Deleting Numbers interactive, math, number theory	2600	x1544
257D	Sum greedy, math	1900	x1543
1592E	Bored Bakry bitmasks, greedy, math, two pointers	2400	x1542
1725C	Circular Mirror binary search, combinatorics, geometry, math, two pointers	2000	x1535
1842E	Tenzing and Triangle data structures, dp, geometry, greedy, math	2300	x1526
1634F	Fibonacci Additions brute force, data structures, hashing, implementation, math	2700	x1524
1928E	Modular Sequence brute force, constructive algorithms, dp, graphs, greedy, math, number theory	2300	x1523
1523E	Crypto Lights combinatorics, dp, math, probabilities	2600	x1523
1080D	Olya and magical square constructive algorithms, implementation, math	2000	x1519
5D	Follow Traffic Rules implementation, math	2100	x1519
1167F	Scalar Queries combinatorics, data structures, math, sortings	2300	x1517
1830C	Hyperregular Bracket Strings combinatorics, greedy, hashing, math, number theory, sortings	2400	x1514
1718C	Tonya and Burenka-179 data structures, greedy, math, number theory	2400	x1513
1667C	Half Queen Cover constructive algorithms, math	2400	x1513
223C	Partial Sums combinatorics, math, number theory	1900	x1510
837E	Vasya's Function binary search, implementation, math	2100	x1506
847I	Noise Level dfs and similar, implementation, math	1900	x1502
1874C	Jellyfish and EVA dp, graphs, greedy, math, probabilities	2300	x1498
538E	Demiurges Play Again dfs and similar, dp, math, trees	2200	x1497
538F	A Heap of Heaps brute force, data structures, math, sortings	2200	x1495
845G	Shortest Path Problem? dfs and similar, graphs, math	2300	x1490
1929E	Sasha and the Happy Tree Cutting bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees	2300	x1484
1927G	Paint Charges data structures, dp, greedy, math	2300	x1480
912E	Prime Gift binary search, dfs and similar, math, meet-in-the-middle, number theory, two pointers	2400	x1480
1773A	Amazing Trick constructive algorithms, graph matchings, math, probabilities	1900	x1479
439E	Devu and Birthday Celebration combinatorics, dp, math	2100	x1474
1032E	The Unbearable Lightness of Weights dp, math	2100	x1472
1505F	Math *special problem, math	2200	x1471
958E1	Guard Duty (easy) brute force, geometry, greedy, math	1600	x1469
325B	Stadium and Games binary search, math	1800	x1469
1843F2	Omsk Metro (hard version) data structures, dfs and similar, divide and conquer, dp, math, trees	2300	x1466
1276C	Beautiful Rectangle brute force, combinatorics, constructive algorithms, data structures, greedy, math	2300	x1465
1098B	Nice table brute force, constructive algorithms, greedy, math	2100	x1465
396A	On Number of Decompositions into Multipliers combinatorics, math, number theory		x1460
1227F2	Wrong Answer on test 233 (Hard Version) combinatorics, math	2400	x1458
1633E	Spanning Tree Queries binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees	2400	x1455
1852C	Ina of the Mountain data structures, dp, greedy, math	2400	x1450
1738E	Balance Addicts combinatorics, dp, math, two pointers	2300	x1450
1594E2	Rubik's Cube Coloring (hard version) brute force, dp, implementation, math, trees	2300	x1446
1848F	Vika and Wiki binary search, bitmasks, combinatorics, divide and conquer, dp, math	2400	x1445
1117E	Decypher the String bitmasks, chinese remainder theorem, constructive algorithms, interactive, math	2200	x1443
1041F	Ray in the tube data structures, divide and conquer, dp, math	2500	x1440
1548D1	Gregor and the Odd Cows (Easy) bitmasks, geometry, math, number theory	2300	x1427
1455E	Four Points brute force, constructive algorithms, flows, geometry, greedy, implementation, math, ternary search	2400	x1426
1216E2	Numerical Sequence (hard version) binary search, math	2200	x1422
346C	Number Transformation II greedy, math	2200	x1417
1513E	Cost Equilibrium combinatorics, constructive algorithms, math, sortings	2300	x1410
1499E	Chaotic Merge combinatorics, dp, math, strings	2400	x1405
126A	Hot Bath binary search, brute force, math	1900	x1402
203D	Hit Ball geometry, implementation, math	1700	x1399
1615E	Purple Crayon data structures, dfs and similar, games, graphs, greedy, math, sortings, trees	2400	x1397
584E	Anton and Ira constructive algorithms, greedy, math	2300	x1396