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- Red and Blue containersCodeChef
- Redeem codeCodeChef
- Reduce TimeCodeChef
- Reduce To OneCodeChef
- Reduce the StringCodeChef
- Reduce to Single DigitCodeChef
- ReducerCodeChef
- Reduction GameCodeChef
- Redundant RantCodeChef
- ReferencesCodeChef
- ReflectionsCodeChef
- Reforms, Reforms Never ChangeCodeChef
- Regex to MachineCodeChef
- Region of CalabriaCodeChef
- Registration DayCodeChef
- Rei Ayanami and Triangular ColonyCodeChef
- Reimer - Tiemann and the ChemisTreeCodeChef
- ReinfectedCodeChef
- Rekha lost a betCodeChef
- RelationsCodeChef
- RelationshipCodeChef
- Relay RaceCodeChef
- Relay RaceCodeChef
- Release DatesCodeChef
- Relevant Phrases of AnnihilationCodeChef
- ReligionCodeChef
- RemainderCodeChef
- Remember My NameCodeChef
- Remember The Old DaysCodeChef
- Remix of SongsCodeChef
- RemovalCodeChef
- Removal GameCSESDynamic Programming
- Removal of a PermutationCodeforces*special
- Removal of cardsCodeChef
- Removal of duplicatesCodeChef
- Remove BracketsCodeChef
- Remove Digit From Number to Maximize ResultCodeChef
- Remove DuplicatesCodeChef
- Remove ErrorsCodeChef
- Remove SimilarCodeChef
- Remove StonesCodeChef
- Remove Sub-ArrayCodeChef
- Remove TwoCodeChef
- Remove X factorCodeChef
- Remove and Append in a Linked ListCodeChef
- Remove booksCodeChef
- Remove itCodeChef
- Remove the dirtCodeChef
- Remove the duplicates from a singly linked listCodeChef
- Removing CardsCodeChef
- Removing DigitsCSESDynamic Programming
- Removing Digits IICSESAdditional Problems II
- Rename this city!CodeChef
- Rendu Bitum Rendu PerumCodeChef
- RenovationCodeChef
- Rent BooksCodeChef
- Rental carCodeChef
- Repeat BinaryCodeChef
- Repeated CalculationsCodeChef
- Repeated StringCodeChef