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- Restoring Painting1400Codeforcesbrute forceconstructive algorithmsmath
- Restricted Sorting1300Codeforcesgreedysortings
- Reverse Card (Easy Version)1400Codeforcesbrute forcemathnumber theory
- Reverse String1300Codeforcesbrute forcedphashingimplementation
- Reverse XOR1300Codeforcesbitmasks
- Reverse and Alternate1746CodeChef
- Ring road1400Codeforcesgraphs
- Road Construction1300Codeforcesconstructive algorithmsgraphs
- Robert Hood and Mrs Hood1400Codeforcesbrute forcedata structuresgreedysortings
- Robot Bicorn Attack1400Codeforcesbrute forceimplementation
- Robot Factory1400Codeforcesbitmasksdfs and similar
- Robot Movings1668CodeChef
- Rock-Paper-Scissors1300Codeforcesimplementationmath
- Romantic Glasses1300Codeforcesdata structuresgreedymath
- Romantic Reversals1646CodeChef
- Rooks1624CodeChef
- Rooks Defenders1400Codeforcesdata structuresimplementation
- Rotation Matching1400Codeforcesconstructive algorithmsdata structuresgreedyimplementation
- Round Corridor1400Codeforcesmathnumber theory
- Routine Problem1400Codeforcesgreedymathnumber theory
- Row Major1400Codeforcesconstructive algorithmsgreedymathnumber theory
- Rubik's Cube Coloring (easy version)1300Codeforcescombinatoricsmath
- Rudolf and Snowflakes (simple version)1300Codeforcesbrute forceimplementationmath
- Rumor1300Codeforcesdfs and similargraphsgreedy
- Rupsa and the Game1692CodeChef
- S to T1640CodeChef
- SUMdamental Decomposition1300Codeforcesbitmasksconstructive algorithmsgreedyimplementation
- Sakurako's Box1400Codeforcescombinatoricsmathnumber theory
- Sakurako's Field Trip1400Codeforcesdpgreedytwo pointers
- Sakurako, Kosuke, and the Permutation1400Codeforcesbrute forcedata structuresdfs and similardsu
- Salyg1n and the MEX Game1300Codeforcesconstructive algorithmsdata structuresgamesgreedy
- Same And1677CodeChef
- Same Parity Swaps in Binary Strings1747CodeChef
- Santa Claus and Robot1400Codeforcesconstructive algorithmsmath
- Saraga1400Codeforcesgreedystrings
- Sasha and Magnetic Machines1300Codeforcesgreedynumber theory
- Sasha and the Apartment Purchase1400Codeforcesmathsortings
- Sasha and the Casino1400Codeforcesbinary searchbrute forceconstructive algorithmsgames
- Satyam and Counting1400Codeforcesgeometrymath
- Save People1750CodeChef
- Save the problem!1400Codeforcesconstructive algorithms
- Saving the City1300Codeforcesdpgreedymathsortings
- Schedule Management1400Codeforcesbinary searchgreedyimplementationtwo pointers
- Scoring Subsequences1300Codeforcesbinary searchgreedymathtwo pointers
- Sea and Islands1400Codeforcesconstructive algorithmsimplementation
- Seat Arrangements1300Codeforcesbrute forceimplementation
- Seating Arrangement (Easy Version)1300Codeforcesbinary searchdpgreedytwo pointers
- Sebi and the highway1621CodeChef
- Secret message1300Codeforcesbitmasksbrute forcedpmath
- Segment Occurrences1300Codeforcesbrute forceimplementation
- Segments1300Codeforcesconstructive algorithmsmath
- Selection of Personnel1300Codeforcescombinatoricsmath
- Self-Destructing Strings1648CodeChef
- Semifinals1300Codeforcesimplementationsortings
- Send the Fool Further! (easy)1400Codeforcesdfs and similargraphstrees
- Seraphim the Owl1300Codeforcesdpgreedy
- Sereja and Bottles1400Codeforcesbrute force
- Sereja and Mirroring1300Codeforcesimplementation
- Serial Time!1400Codeforcesdfs and similardsu
- Server Trouble1791CodeChef