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- Reverse and Concatenate800Codeforcesgreedystrings
- Review Site800Codeforcesgreedy
- Rewards800Codeforcesimplementation
- Rigged!800Codeforcesgreedy
- Right Maximum800Codeforcesgreedy
- Right There299CodeChef
- Right-Left Cipher800Codeforcesimplementationstrings
- Rising Sand800Codeforcesconstructive algorithmsgreedyimplementation
- Rivalry501CodeChef
- Robin Helps800Codeforcesgreedyimplementation
- Robin Hood and the Major Oak800Codeforcesmath
- Robot Cleaner800Codeforcesbrute forceimplementationmath
- Robot Program800Codeforcesmath
- Robots800Codeforcesimplementation
- Roller Coaster285CodeChef
- Roma and Lucky Numbers800Codeforcesimplementation
- Rook800Codeforcesimplementation
- Room Allocation729CodeChef
- Ropewalkers800Codeforcesmath
- Round Down the Price800Codeforcesconstructive algorithms
- Round Trip800Codeforcesgamesgreedyimplementationmath
- Rounding800Codeforcesimplementationmath
- Rudolf and the Ticket800Codeforcesbrute forcemath
- Rudolph and Cut the Rope 800Codeforcesimplementationmath
- Rudolph and Tic-Tac-Toe800Codeforcesbrute forceimplementationstrings
- Run Chase172CodeChef
- Run for Fun375CodeChef
- Running Comparison899CodeChef
- Rush to Exam253CodeChef
- SSeeeeiinngg DDoouubbllee800Codeforcesconstructive algorithmsstrings
- Sabotage984CodeChef
- Sakurako and Kosuke800Codeforcesconstructive algorithmsimplementationmath
- Sakurako's Exam800Codeforcesbrute forceconstructive algorithmsgreedymath
- Sale1180CodeChef
- Sale Season541CodeChef
- Same Difference800Codeforcesbrute forcegreedystrings
- Santa Claus and a Place in a Class800Codeforcesimplementationmath
- Sasha and Array Coloring800Codeforcesgreedysortingstwo pointers
- Sasha and Sticks800Codeforcesgamesmath
- Sasha and the Beautiful Array800Codeforcesconstructive algorithmsgreedymathsortings
- Sasha and the Drawing800Codeforcesconstructive algorithmsgreedymath
- Sasta Shark Tank592CodeChef
- Satisfying Constraints800Codeforcesbrute forcegreedymath
- Save Luke800Codeforcesmath
- Saving Taxes252CodeChef
- Savings Account720CodeChef
- Scale800Codeforcesgreedyimplementation
- Scalene Triangle430CodeChef
- Scarborough Fair800Codeforcesimplementation
- Score High672CodeChef
- Scoring569CodeChef
- Sea Battle800Codeforcesmath
- Search an element in an array600CodeChef
- Seated Together136CodeChef
- Seating in a Bus800Codeforcestwo pointers
- Second Largest730CodeChef
- Second Max of Three Numbers300CodeChef
- Second Order Statistics800Codeforcesbrute force
- Second-Price Auction800Codeforcesimplementation
- Secret Recipe888CodeChef