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- Sea, You & copriMe2600Codeforcesbrute forceconstructive algorithmsgraphsgreedy
- Searching for the Recipe2807CodeChef
- Sebi and the black money2873CodeChef
- Sebi and the cube2616CodeChef
- Secret Lilies and Roses2700Codeforcesinteractive
- Secret Tree2609CodeChef
- Segment Queries2679CodeChef
- Segmentation Folds2400Codeforcesbrute forcedfs and similarnumber theory
- Segments on the Line2500Codeforcesbinary searchdp
- Self-exploration2400Codeforcesmath
- Selling Tickets2640CodeChef
- Send the Fool Further! (hard)2400Codeforcesdfs and similardpmathtrees
- Sequence Creation2627CodeChef
- Sequence Master2742CodeChef
- Sequence of Balls2600Codeforcesdp
- Serega and Fun2700Codeforcesdata structures
- Serega the Pirate2600Codeforcesbrute forceconstructive algorithms
- Sereja and Arcs2842CodeChef
- Sereja and BOX2747CodeChef
- Sereja and Cinema2500Codeforcescombinatoricsmath
- Sereja and Dividing2600Codeforcesdata structures
- Sereja and Dividing2697CodeChef
- Sereja and Increasing subsequence2771CodeChef
- Sereja and Intervals2700Codeforcescombinatoricsdp
- Sereja and Inversions2873CodeChef
- Sereja and Order2749CodeChef
- Sereja and Permutations2805CodeChef
- Sereja and Sets2500Codeforcesdp
- Sereja and Sets2400Codeforcesbitmasksdfs and similar
- Sereja and Stones2673CodeChef
- Sereja and Straight Lines2500Codeforcesbinary searchdata structuresgeometrysortings
- Sereja and Subsegment Increasings2766CodeChef
- Sereja and Tree2400Codeforcesgraphsimplementation
- Series Sum2869CodeChef
- Serval and Bonus Problem2600Codeforcescombinatoricsdpmathprobabilities
- Serval and Brain Power2700Codeforcesbitmasksbrute forcedpgreedy
- Serval and Colorful Array (Easy Version)2600Codeforcesdata structuresgreedy
- Serval and Music Game2500Codeforcesbrute forcedpimplementationmath
- Servers2891CodeChef
- Session in BSU2400Codeforcesbinary searchdfs and similardsugraph matchings
- Set2600Codeforcesbitmasksbrute forcecombinatoricsdfs and similar
- Sets of Complementary Sums2500Codeforcesbrute forcecombinatoricsdpmath
- Seven-Segment Factoring2675CodeChef
- Shaass and Painter Robot2500Codeforcesbrute forceimplementationnumber theory
- Sherlock and His Device2699CodeChef
- Shiori Miyagi and Maximum Array Score2400Codeforcesbinary searchdata structuresdpsortings
- Ship's Shortest Path2400Codeforcesgeometryshortest paths
- Shoe Store2500Codeforcesdpgraph matchingsgreedysortings
- Shooting (Hard)2854CodeChef
- Shooting Gallery2500Codeforcesdata structuresimplementation
- Shop Game (Easy)2825CodeChef
- Short II2640CodeChef
- Shortest path2700Codeforcesbrute forcegeometrymathshortest paths
- Shuffle2400Codeforcesdpgreedytrees
- Shuffling2701CodeChef
- Shuffling Cards with Problem Solver 68!2500Codeforceshashingstring suffix structuresstrings
- Sign on Fence2500Codeforcesbinary searchconstructive algorithmsdata structures
- Simba on the Circle2600Codeforcesdp
- Similar Polynomials2400Codeforcescombinatoricsmath
- Similar Subsequence2689CodeChef