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- Ants3200Codeforces2-satdata structurestrees
- Ants (Challenge) 3767CodeChef
- Ants on a Circle2800Codeforcesconstructive algorithmsmath
- Append Array2915CodeChef
- Appending Permutations (Hard Version)2800Codeforcescombinatoricsdp
- Appleman and Complicated Task2800Codeforcesdsumath
- Appleman and a Game3000Codeforcesbinary searchshortest pathsstrings
- Apples and Oranges2947CodeChef
- April Fools' Problem (hard)2900Codeforcesbinary searchdata structuresflows
- AquaMoon and Permutations2800Codeforces2-satbrute forcecombinatoricsconstructive algorithms
- AquaMoon and Potatoes3500Codeforcesbrute forcedata structuresdp
- AquaMoon and Time Stop (easy version)3500Codeforcesdata structuresdp
- AquaMoon and Time Stop (hard version)3500Codeforcesdata structuresdp
- AquaMoon and Wrong Coordinate3000Codeforcesconstructive algorithmsinteractivemath
- Aquatic Dragon3500Codeforces
- Archaeology3100Codeforcesdata structuresdfs and similartrees
- Arctic Acquisition3500Codeforcesdata structuresgreedy
- Area Sums in Convex Polygons2904CodeChef
- Arithmancy (Hard)3100Codeforcesinteractive
- Arithmetic Jumping3242CodeChef
- Arkady and Rectangles3300Codeforcesdata structures
- Armistice Area Apportionment3200Codeforcesbinary searchgeometry
- Armor and Weapons2800Codeforcesbrute forcedpgreedyshortest paths
- Around the World3000Codeforcesbitmaskscombinatoricsdfs and similardp
- Arpa’s abnormal DNA and Mehrdad’s deep interest3400Codeforcesdata structuresstring suffix structures
- Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths2900Codeforcesdata structuresdfs and similartrees
- Arranging Crystal Balls3500Codeforcesdata structuresdivide and conquerdpgeometry
- Array Covering3100Codeforcesdata structures
- Array Game3000Codeforcesdata structuresgames
- Array and Operations3110CodeChef
- Array operations2959CodeChef
- Art in Digital Age3550CodeChef
- Artistic Partition3000Codeforcesdivide and conquerdpnumber theory
- Assigning Fares3500Codeforcesdptrees
- Assignment of Tasks3220CodeChef
- Assiut Chess2800Codeforcesbrute forceconstructive algorithmsinteractive
- Asterisk Substrings3400Codeforcesstring suffix structures
- Asterism Stream3200Codeforcesdpmathmatrices
- Astronomy3300Codeforcesgeometryprobabilities
- Attraction Score3000Codeforces
- Au Pont Rouge2800Codeforcesbinary searchdpstrings
- Avoid Alternating3145CodeChef
- Avoid Monster3549CodeChef
- Avoid The Landmines3044CodeChef
- BFS before DFS3197CodeChef
- BRT Contract 2800Codeforcesdata structures
- Bad Cryptography3400Codeforcesmathnumber theory
- Bad Tuples3115CodeChef
- Bakery2900Codeforcesdata structuresdsu
- Balance3500Codeforcesbitmaskscombinatoricsimplementationmath
- Balance the Cards3500Codeforcesconstructive algorithmsdata structuresdivide and conquergeometry
- Balanced Distribution3500Codeforcesdata structuresdpgreedy
- Balanced Problem3000Codeforcesdata structuresdp
- Balanced Reversals3300Codeforcesconstructive algorithms
- Balancing Game2919CodeChef
- Ball-Stackable3300Codeforcesconstructive algorithmsdata structuresdptrees
- Balls and Pockets3400Codeforcesdata structures
- Bandit Blues2900Codeforcescombinatoricsdpfftmath
- Bank of Wasseypur3156CodeChef
- Banners3000Codeforcesbrute forcedata structuresdp