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- Restore the Permutation by Sorted Segments2400Codeforcesbrute forceconstructive algorithmsdata structuresgreedy
- Reverse and Alternate (Count)2610CodeChef
- Reverse and Swap2400Codeforcesbinary searchbitmasksdata structures
- Rhombus2500Codeforcesbrute forcedata structuresdp
- Rigged Game2680CodeChef
- Road Projects2600Codeforcesdfs and similardptrees
- Road to 16002400Codeforcesbrute forceconstructive algorithms
- Road to Home2700Codeforcesbinary searchdp
- Roads in Stars2850CodeChef
- Roads in the Kingdom2500Codeforcesdfs and similardpgraphstrees
- Robot Arm2500Codeforcesdata structuresgeometry
- Robot Control2600Codeforcesdpgraphsshortest paths
- Robot and Candies2500Codeforcesdata structuresgraph matchingsgreedy
- Robot in Basement2700Codeforcesbitmasksbrute forceimplementation
- Robots Again2800CodeChef
- Rock-Paper-Scissors Champion2500Codeforces
- Rocket Pack2896CodeChef
- Rogue-like Game2600Codeforces*specialbrute forcegreedytwo pointers
- Roland and Rose2700Codeforcesbrute forcegeometrymathsortings
- Rollbacks (Easy Version)2500Codeforcesbrute forcedata structuresdfs and similartrees
- Rollbacks (Hard Version)2600Codeforcesdata structuresinteractivetrees
- Rook Path2892CodeChef
- Rook Placement2872CodeChef
- Rooks and Rectangles2400Codeforcesdata structuressortings
- Room Corner2755CodeChef
- Rooted Minimum Spanning Tree2642CodeChef
- Roots of a Tree2860CodeChef
- Rotatable Number2600Codeforcesmathnumber theory
- Rotate Columns (hard version)2500Codeforcesbitmasksdpgreedysortings
- Rotate Matrix2400Codeforces*special
- Rotate Point2767CodeChef
- Rotate the Polyline2819CodeChef
- Rotate to Minimum2637CodeChef
- Rotating Substrings2600Codeforcesdpstrings
- Round Marriage2500Codeforcesbinary searchgraph matchingsgreedy
- Routing2400Codeforcesbitmasksbrute forcedfs and similardp
- Row of Models2500Codeforcesgreedysortings
- Rowena Ravenclaw's Diadem2500Codeforcestrees
- Royal Questions2500Codeforcesdsugraphsgreedy
- Rubber Band2869CodeChef
- Runaway to a Shadow2500Codeforcesgeometrysortings
- Running Competition2600Codeforcesbitmasksfftmathnumber theory
- Running in Pairs2400Codeforcesconstructive algorithmsgreedymath
- Rusty String2700Codeforcesfftmathstrings
- Résumé Review2700Codeforcesbinary searchgreedymath
- S Semi-palindromic2750CodeChef
- Saber Slays2778CodeChef
- Safe Partition2708CodeChef
- Sagheer and Kindergarten2700Codeforcesdfs and similargraphsimplementationtrees
- Sanae and Giant Robot2500Codeforcesbinary searchbrute forcedata structuresdsu
- Sandy and Nuts2600Codeforcesbitmasksdptrees
- Sasha Circle2700Codeforcesgeometrymath
- Sasha and Interesting Fact from Graph Theory2400Codeforcesbrute forcecombinatoricsdpmath
- Sasha and a Very Easy Test2700Codeforcesdata structuresnumber theory
- Save the City!2500Codeforcesgeometry
- Save the nature2626CodeChef
- Savior2500Codeforcesbrute forcedsumath
- Scaygerboss2700Codeforcesflows
- Scissors2600Codeforcesbrute forcestrings
- Scoring Tree2867CodeChef