A.
Reverse Hash Binary strings are strings that can only have 0 or 1 as the characters. The hash value of a string i... |

B.
Easy But Easy Game Alice and Bob are playing a game on a string s of length n consisting of characters ‘0’ and ‘1’. The... |

C.
The Matrix In the metaphysical world of the Matrix, different people make their chessboards with their own spec... |

D.
Land of Riches Mankind has recently discovered the secret wealth in Mars. Many powerful countries are trying to get... |

E.
Counting Matrices Given a natural number N and a prime p, let’s define a special set Zp={0,1,2,…,p−1}. Now count the ... |

F.
Wireless Signal The city of Byteland is rectangular in shape and can be represented as a 2D coordinate system with n... |

Practice contests allow you to re-run contests and experience them as close as possible to the original run.

2Sat, Adhoc, ApolloneasTheorem, Backtracking, BFS, Bignum, BinarySearch, BipartiteMatching, Bitmask, BruteForce, ChineseRemainderTheorem, Combinatorics, ConvexHull, CutVertex, DataStructure, DFS, DigitDP, DisjointSets, DivideAndConquer, DP, Eertree, EulerTour, ExpectedValue, FenwickTree, FFT, Flow, Game, GCD, Geometry, Graph, Greedy, Hashing, HeavyLightDecomposition, Implementation, InclusionExclusion, Interactive, KnuthMorrisPratt, LowestCommonAncestor, Math, Matrix, MatrixExponentiation, MergeSortTree, ModularExponentiation, MOSAlgorithm, MST, NTT, NumberTheory, Parsing, PersistentLiChaoTree, PersistentSegmentTree, PollardRho, PriorityQueue, Probability, Queue, RabinMiller, RangeOrderStatistics, Scheduling, SegmentTree, ShortestPath, Simulation, Sorting, SparseTable, SpragueGrundyTheorem, SqrtDecomposition, Stack, String, StronglyConnectedComponents, SuffixStructure, TernarySearch, Tree, Trie, TwoPointer, WaveletTree

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