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- Anti-knapsack2566CodeChef
- Antichain2200Codeforcesdpgraph matchingsgreedy
- Antimatter2300Codeforcesdp
- Antipodal Points2522CodeChef
- Anton and Ira2300Codeforcesconstructive algorithmsgreedymath
- Anton and Permutation2200Codeforcesbrute forcedata structures
- Anton and School - 22300Codeforcescombinatoricsdpmathnumber theory
- Anton and Tree2100Codeforcesdfs and similardptrees
- Ants in Leaves2200Codeforcesdfs and similargreedysortingstrees
- Anya and Cubes2100Codeforcesbinary searchbitmasksbrute forcedp
- Appending Permutations (Easy Version)2300Codeforcescombinatoricsdp
- Apple Tree2100Codeforcesdfs and similarnumber theorytrees
- Apple Tree Traversing2100Codeforcesbrute forcedfs and similargreedyimplementation
- Appleman and a Sheet of Paper2200Codeforcesdata structuresimplementation
- Arbitrary Shuffling2487CodeChef
- Archer's Shot2300Codeforcesbinary searchgeometrymathtwo pointers
- Archi and Tree2452CodeChef
- Ardent Flames2100Codeforcesbinary searchdata structuresmathsortings
- Area of a Star2100Codeforcesgeometrymath
- Arena2100Codeforcescombinatoricsdpmath
- Arithmancy (Easy)2100Codeforcesbrute forceconstructive algorithmsinteractivestrings
- Arithmetic Operations2300Codeforcesbrute forcedata structuresgraphsmath
- Arithmetic Progression2200Codeforcesbinary searchinteractivenumber theoryprobabilities
- Arithmetic Progressions2587CodeChef
- Army Creation2200Codeforcesbinary searchdata structures
- Arpa and a game with Mojtaba2200Codeforcesbitmasksdpgames
- Arpa and a list of numbers2100Codeforcesimplementationnumber theory
- Array Collapse2100Codeforcesdata structuresdivide and conquerdptrees
- Array Concatanation2410CodeChef
- Array GCD2300Codeforcesdpgreedynumber theory
- Array Partition2100Codeforcesbinary searchdata structuresgreedytwo pointers
- Array Reduction2200Codeforces*specialgreedy
- Array Shrinking2100Codeforcesdpgreedy
- Array Sorting2300Codeforces*special
- Array and Operations2100Codeforcesflowsgraph matchingsnumber theory
- Array and Segments (Hard version)2100Codeforcesdata structuresimplementation
- Array sorting2300Codeforces*specialsortings
- Arrays Sum2530CodeChef
- Arson In Berland Forest2200Codeforcesbinary searchgraphsshortest paths
- Arthur and Brackets2200Codeforcesdpgreedy
- Arthur and Questions2200Codeforcesgreedyimplementationmathternary search
- Assimilation IV2100Codeforcescombinatoricsdpmathprobabilities
- Asterism (Hard Version)2300Codeforcesbinary searchcombinatoricsdpmath
- At least One2400CodeChef
- Auto Complete2300Codeforcesbinary searchdata structureshashingimplementation
- Automatic Door2200Codeforcesimplementation
- Autosynthesis2100Codeforcesconstructive algorithmsdfs and similargraphsgreedy
- Award Ceremony2200Codeforcesgreedyimplementation
- Awards For Contestants2300Codeforcesbrute forcedata structuresdp
- Awkward Pairs2425CodeChef
- Axis Walking2300Codeforcesbitmaskscombinatoricsconstructive algorithmsdp
- BHTML+BCSS2200Codeforces*specialdfs and similarexpression parsing
- Back Front2503CodeChef
- Backup Functions2468CodeChef
- Bacterial Reproduction2537CodeChef
- Baggage Claim2300Codeforcescombinatoricsdfs and similardpdsu
- Baking Cupcakes2468CodeChef
- Balance Addicts2300Codeforcescombinatoricsdpmathtwo pointers
- Balanced 0-1 Tree2526CodeChef
- Balanced String2200Codeforcesdp