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- Reign1855CodeChef
- Removal of a Sequence (Easy Version)1500Codeforcesbinary searchimplementationmathnumber theory
- Remove Adjacent1600Codeforcesbrute forceconstructive algorithmsgreedystrings
- Remove Exactly Two1600Codeforcesbrute forcedata structuresdfs and similardp
- Remove One Element1500Codeforcesbrute forcedp
- Remove and Add1877CodeChef
- Remove the Bracket1600Codeforcesdpgreedymath
- Remove the Substring (easy version)1600Codeforcesgreedyimplementation
- Removing Columns1500Codeforcesbrute forceconstructive algorithmsimplementation
- Repaintings1600Codeforcesmath
- Repeated String1899CodeChef
- Replace With First1934CodeChef
- Replace With the Previous, Minimize1500Codeforcesdsugreedystrings
- Replacement1600Codeforcesconstructive algorithmsdata structuresimplementation
- Representative Edges1500Codeforcesbrute forcegeometryimplementationmath
- Resort1500Codeforcesgraphs
- Restaurant1600Codeforcesdpgreedysortings
- Restaurant Expansion1975CodeChef
- Restaurant Rating1851CodeChef
- Restore Modulo1500Codeforcesimplementationmath
- Restoring IPv61500Codeforcesimplementationstrings
- Restoring Table1500Codeforcesconstructive algorithmsgreedy
- Restoring the Permutation1500Codeforcesconstructive algorithmsimplementation
- Return of the Gargoyle King1861CodeChef
- Reverse It!1600Codeforces*specialimplementation
- Reverse Madness1600Codeforcesdata structuresgreedy
- Reverse the Rivers1600Codeforcesbinary searchconstructive algorithmsdata structuresgreedy
- Right Triangles1600Codeforcescombinatorics
- Rings1500Codeforcesconstructive algorithmsmath
- Road Map1600Codeforcesdfs and similargraphs
- Robot Breakout1500Codeforcesimplementation
- Robot on the Board 11600Codeforcesimplementation
- Root the Tree1934CodeChef
- Rotation1500Codeforces*specialgeometrymath
- Round Dance1600Codeforcesdfs and similardsugraphsshortest paths
- Round Table Knights1600Codeforcesdpmathnumber theory
- Row GCD1600Codeforcesmathnumber theory
- Rudolf and k Bridges1600Codeforcesbinary searchdata structuresdptwo pointers
- Ruler (easy version)1500Codeforcesbinary searchinteractive
- Running for Gold1500Codeforcescombinatoricsgraphsgreedysortings
- Running with Obstacles1600Codeforces*specialdata structuresdpgreedy
- Rupsa and Equilateral Triangle1881CodeChef
- STL1500Codeforcesdfs and similar
- Sage's Birthday (hard version)1500Codeforcesbinary searchbrute forceconstructive algorithmsgreedy
- Sagheer and Nubian Market1500Codeforcesbinary searchsortings
- Sagheer, the Hausmeister1600Codeforcesbitmasksbrute forcedp
- Sam, The Charming Angel1914CodeChef
- Same Count One1600Codeforcesbrute forceconstructive algorithmsgreedyimplementation
- Santa Claus and Keyboard Check1500Codeforcesimplementationstrings
- Sasha and a Bit of Relax1600Codeforcesdpimplementation
- Save The Princess1897CodeChef
- Save the Nature1600Codeforcesbinary searchgreedy
- Say No to Palindromes1600Codeforcesbrute forceconstructive algorithmsdpstrings
- Search in Parallel1500Codeforcesconstructive algorithmsgreedysortings
- Searching for Graph1500Codeforcesbrute forceconstructive algorithmsgraphs
- Seating Arrangement (Hard Version)1500Codeforcesbinary searchgreedymathtwo pointers
- Seating Arrangements (hard version) 1600Codeforcesdata structuresgreedyimplementationsortings
- Secret1500Codeforcesconstructive algorithmsimplementation
- Secret Combination1500Codeforcesbrute forceconstructive algorithmsimplementation
- Secret Passwords1500Codeforcesdfs and similardsugraphs