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- Puppy and cats2490CodeChef
- Pursuit For Artifacts2300Codeforcesdfs and similardsugraphstrees
- Puzzling Language2200Codeforces*specialconstructive algorithms
- Qpwoeirut and Vertices2300Codeforcesbinary searchdata structuresdfs and similardivide and conquer
- Queries On Tree2443CodeChef
- Quest2100Codeforcesdpgreedy
- Queue2300Codeforcesdata structures
- Queue in the Train2300Codeforcesdata structuresgreedyimplementation
- Quick Exit2475CodeChef
- RPD and Rap Sheet (Hard Version)2200Codeforcesbrute forceconstructive algorithmsinteractivemath
- Race2300Codeforcesbrute forceimplementationtwo pointers
- Race2300Codeforcesbrute forceimplementation
- Rada and the Chamomile Valley2100Codeforcesdfs and similargraphsshortest paths
- Radio stations2200Codeforcesbinary searchdata structures
- Railguns2200Codeforcesbrute forcedfs and similardpgraphs
- Rain2100Codeforcesbinary searchbrute forcedata structuresgeometry
- Rain and Umbrellas2100Codeforcesdp
- Ralph And His Tour in Binary Country2200Codeforcesbrute forcedata structurestrees
- Ralph and Mushrooms2100Codeforcesdpgraphs
- Random Chocolates2450CodeChef
- Random Task2100Codeforcesbinary searchbitmaskscombinatoricsdp
- Range Deleting2100Codeforcesbinary searchcombinatoricsdata structurestwo pointers
- Range Maximum Deconstruction (Easy)2503CodeChef
- Range Minimum Sum2300Codeforcesbinary searchbrute forcedata structuresdivide and conquer
- Rank Queries2555CodeChef
- Ranka2410CodeChef
- Rarity and New Dress2100Codeforcesdfs and similardpimplementationshortest paths
- Rats2300Codeforcesbrute forcedfs and similargraphsimplementation
- Reach Anywhere2554CodeChef
- Rearrange Brackets2100Codeforcesbrute forcedpgreedysortings
- Recovering BST2100Codeforcesbrute forcedpmathnumber theory
- Rectangle Painting 12300Codeforcesdp
- Rectangle Shrinking2300Codeforcesbinary searchbrute forcedata structuresgreedy
- Rectangles2100Codeforcesbrute forcedata structuresdpdsu
- Rectangular Congruence2100Codeforcesconstructive algorithmsnumber theory
- Red Light, Green Light (Hard version)2200Codeforcesbinary searchbrute forcedata structuresdfs and similar
- Red and blue points2408CodeChef
- Red-Black Number2100Codeforcesdfs and similardpimplementationmath
- Red-Black Pepper2300Codeforcesbrute forcedata structuresgreedymath
- Red-Blue Operations (Easy Version)2100Codeforcesbinary searchgreedyimplementationmath
- Red-blue Trees2446CodeChef
- Reducing Delivery Cost2100Codeforcesbrute forcegraphsshortest paths
- Reign 22446CodeChef
- Remainder Problem2100Codeforcesbrute forcedata structuresimplementation
- Removal of a Sequence (Hard Version)2100Codeforcesbinary searchdivide and conquergreedyimplementation
- Remove Adjacent2527CodeChef
- Removing Leaves2300Codeforcesdata structuresgreedyimplementationtrees
- Remys last tour2434CodeChef
- Repairing Of String2200Codeforces*specialconstructive algorithms
- Replace With First Literally2531CodeChef
- Representative Sampling2200Codeforcesdpsortingsstrings
- Restore a Number2300Codeforcesbrute forceconstructive algorithmsstrings
- Restorer Distance2100Codeforcesbinary searchgreedymathsortings
- Restoring Numbers2200Codeforcesconstructive algorithmsmath
- Restoring the Expression2300Codeforcesbrute forcehashingmath
- Returning Home2300Codeforcesgraphsshortest pathssortings
- Reverse Card (Hard Version)2200Codeforcesbrute forcemathnumber theory
- Ring Road 22200Codeforces2-satdfs and similardsugraphs
- Rise of Cyborgs2533CodeChef
- Road Construction2300Codeforcesflowsgraphs