A.
Move It! Few of my friends are working on a game called “Move It!”. It's a tile-based game played on an $n\ti... |

B.
Create Some Walls! Mahdi has finally found some time to build his dream house. He had been looking for some cool design... |

C.
Equalizing Pillars There are $N$ pillars made of bricks. The height of each pillar is the number of bricks in that pill... |

D.
Congruence Problem Find the number of integer solutions of $ x^2 + 4x + 3 ≡ 0 $ $ (\text{mod } $ $m) $ where $ 0 \leq x... |

E.
Fabby and Her Wedding Dress You all remember Fabby, the princess of Byteland. People of Byteland are waiting for the biggest cel... |

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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