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- Again XOR problem1786CodeChef
- Age Calculator1724CodeChef
- Alarm Clocks Everywhere1300Codeforcesmathnumber theory
- Alice and Hairdresser1300Codeforcesdsuimplementation
- Alice and the Cake1400Codeforcesdata structuresgreedyimplementationsortings
- Alice's Adventures in Permuting1400Codeforcesbinary searchimplementationmath
- Alice, Bob and Candies1300Codeforcesimplementation
- Alice, Bob, Two Teams1400Codeforcesbrute forceconstructive algorithms
- All-in-one Gun1300Codeforcesbinary searchgreedymath
- Almost All Multiples1400Codeforcesgreedynumber theory
- Almost Sorted Permutation1686CodeChef
- Alphabet City1300Codeforcesbinary searchmathstrings
- Alternate It!1789CodeChef
- Alternating Path1400Codeforcesconstructive algorithmsdfs and similargraph matchingsgraphs
- Alya and Permutation1400Codeforcesbitmasksconstructive algorithmsmath
- Alyona and a Narrow Fridge1300Codeforcesbinary searchflowsgreedysortings
- Alyona and copybooks1300Codeforcesbrute forceimplementation
- Am I a Fibonacci Number1663CodeChef
- Amphibian Escape1778CodeChef
- Amr and Pins1400Codeforcesgeometrymath
- Amr and The Large Array1300Codeforcesimplementation
- An express train to reveries1300Codeforcesconstructive algorithms
- Anatoly and Cockroaches1400Codeforcesgreedy
- And It's Non-Zero1300Codeforcesbitmasksgreedymath
- And Or Union1728CodeChef
- Anfisa the Monkey1400Codeforcesdp
- Anji's Binary Tree1300Codeforcesdfs and similardptrees
- Anna and the Valentine's Day Gift1400Codeforcesgamesgreedymathsortings
- Annoying Game1400Codeforcesdpgamesgreedy
- Anonymous Informant1400Codeforcesbrute forcedfs and similargraphsimplementation
- Another Birthday Present!1757CodeChef
- Anti Palindrome1759CodeChef
- Anti-Palindrome Queries1688CodeChef
- Anti-Sudoku1300Codeforcesconstructive algorithmsimplementation
- Anti-Triangle1627CodeChef
- Anton and currency you all know1300Codeforcesgreedymathstrings
- Append Average1604CodeChef
- Applejack and Storages1400Codeforcesconstructive algorithmsdata structuresgreedyimplementation
- Appleman and Card Game1300Codeforcesgreedy
- Approximating a Constant Range1400Codeforcesdpimplementationtwo pointers
- Arboris Contractio1400Codeforcesdata structuresgraphsgreedytrees
- Archer1300Codeforcesmathprobabilities
- Arena of Greed1400Codeforcesgamesgreedy
- Army Training1742CodeChef
- Arpa and an exam about geometry1400Codeforcesgeometrymath
- Arrange the Numbers in a Circle1300Codeforcesconstructive algorithmsimplementationmath
- Arranging The Sheep1400Codeforcesgreedymath
- Array Elimination1300Codeforcesbitmasksgreedymathnumber theory
- Array Game1400Codeforcesbinary searchbrute forcedata structuressortings
- Array K-Coloring1400Codeforcesgreedysortings
- Array Modification1624CodeChef
- Array Operations1620CodeChef
- Array Recoloring1300Codeforcesconstructive algorithmsgreedy
- Array Rotation1615CodeChef
- Array Sharpening1300Codeforcesgreedyimplementation
- Array Splitting1400Codeforcesgreedysortings
- Array Swaps1619CodeChef
- Array and GCD1400Codeforcesbinary searchgreedymathnumber theory
- Array and Operations1300Codeforcesdpgreedymath
- Array sorting1681CodeChef