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- Repeated String PatternCodeChef
- Repeating Decimal ProblemCodeChef
- Repeating SubstringCSESString Algorithms
- RepetitionCodeChef
- Repetition in StringCodeChef
- RepetitionsCodeChef
- RepetitionsCSESIntroductory Problems
- RepetitionsCodeChef
- Repetitive MathCodeChef
- Repetitive StringCodeChef
- RephrasingCodeChef
- Replace LetterCodeChef
- Replace NumberCodeChef
- Replace X with -XCodeChef
- Replace all PiCodeChef
- Replace for XCodeChef
- Replace with DifferenceCSESAdditional Problems II
- Reporting CogniCodeChef
- Representative SelectionCodeChef
- Representative of Missing LettersCodeChef
- Republic DayCodeChef
- Republic Day ParadeCodeChef
- Republic Day SweetsCodeChef
- Republic SubarrayCodeChef
- RequestsCodeChef
- Required SubstringCSESString Algorithms
- RescueCodeChef
- Rescue BalinCodeChef
- Rescue Eleven!CodeChef
- Rescue Hermione!CodeChef
- Rescue Jack SparrowCodeChef
- Rescue Mad EyeCodeChef
- Rescue SonCodeChef
- Rescuing Vanessa yet again!CodeChef
- Reservoir AttackCodeChef
- ResistorsCodeChef
- Resolve The FightCodeChef
- Responsible Albus DumbledoreCodeChef
- Responsible Albus Dumbledore - Part 2CodeChef
- Restaurant CustomersCSESSorting and Searching
- Restaurant and dishesCodeChef
- Restaurant platesCodeChef
- Restore ArrayCodeChef
- Restore NalandaCodeChef
- Restore StringCodeChef
- Result AlgorithmCodeChef
- Result CodeCodeChef
- Result of Chef and PajaCodeChef
- Retail ShopCodeChef
- Retaliation - 2nd Surgical StrikeCodeChef
- Return of BowserCodeChef
- Return of KaruneeCodeChef
- Reunion 2016CodeChef
- RevDifCodeChef
- RevKElementsCodeChef
- RevengeCodeChef
- RevengeCodeChef
- Revenge RahulCodeChef
- Revenge of CerseiCodeChef
- Revenge of Jon SnowCodeChef