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- Simons and Reconstructing His Roads2400Codeforcesconstructive algorithmsdata structuresdsugraphs
- Simple Cycles Edges2400Codeforcesdfs and similargraphstrees
- Simple Skewness2400Codeforcesbinary searchmathternary search
- Simplified Nonogram2400Codeforcesbitmasksdphashingmeet-in-the-middle
- Simultaneous Robots2717CodeChef
- Sines Sum Queries2702CodeChef
- Sink2600Codeforcesdata structuresdivide and conquerdsugraphs
- Six Seven2600Codeforcesdivide and conquermathnumber theorystrings
- Ski Accidents2500Codeforcesconstructive algorithmsgraphsgreedy
- Sky Full of Stars2500Codeforcescombinatoricsmath
- Sleep Technique 2673CodeChef
- Sleep in Class2400Codeforcesconstructive algorithmsdata structuresmathtwo pointers
- Sleeping2700Codeforcescombinatoricsimplementationmath
- Slingshot2839CodeChef
- Small Permutation Problem (Hard Version)2500Codeforcescombinatoricsdpmath
- Smallest Excluded LCM2673CodeChef
- SmartGarden2500Codeforcesconstructive algorithmsdivide and conquer
- Smile House2500Codeforcesbinary searchgraphsmatrices
- Smooth Sailing (Easy Version)2500Codeforcesbinary searchbrute forcedata structuresdfs and similar
- Snakes on a Grid2826CodeChef
- Snaking Arrangement2600Codeforcescombinatoricsconstructive algorithms
- Solve the Assignment2664CodeChef
- Solve what you want2688CodeChef
- Some Impact2612CodeChef
- Something About Divisors2669CodeChef
- Song of the Sirens2600Codeforcescombinatoricsdivide and conquerhashingmath
- Sonya and Bitwise OR2600Codeforcesbitmasksdata structuresdivide and conquer
- Sonya and Gifts2698CodeChef
- Sonya and Ice Cream2400Codeforcesbinary searchdata structuresdpgreedy
- Sonya and Matrix Beauty2400Codeforcesstrings
- Sonya and Segments2621CodeChef
- Sort String2815CodeChef
- Sort a String2780CodeChef
- Sort the Table2400Codeforces*specialsortings
- Sortable Subarrays (Hard)2739CodeChef
- Sorting2650CodeChef
- Sorting Books2500Codeforcesdata structuresdpgreedy
- Sorting Problem Again2600Codeforcesbinary searchdata structuressortings
- Sorting the Binary String2690CodeChef
- Sorting with Set2621CodeChef
- Sources and Sinks2700Codeforcesbitmasksbrute forcedfs and similar
- Space Isaac2400Codeforceshashingnumber theory
- Space mines2500Codeforcesgeometry
- Spanning Tree Queries2400Codeforcesbinary searchdata structuresdfs and similardsu
- Special Agents2815CodeChef
- Special Economic Zone2689CodeChef
- Special Graph2500Codeforces
- Special String2886CodeChef
- Speedrunning (Easy)2766CodeChef
- Spinach Pizza2500Codeforcesgamesgeometrygreedyinteractive
- Split2700Codeforcesbinary searchdata structuresdivide and conquerdsu
- Split Powers Of 22709CodeChef
- Split and ADD2622CodeChef
- Split the Tree2400Codeforcesbinary searchdata structuresdpgreedy
- Splittable Permutations2500Codeforcescombinatoricsdata structuresdfs and similargreedy
- Splitting the Uniqueness2400Codeforcesconstructive algorithms
- Sports Betting2500Codeforcesbitmaskscombinatoricsdpgraphs
- Spread of Ratism2691CodeChef
- Spruce Dispute2600Codeforcesconstructive algorithmsdfs and similargraphsgreedy
- Square Count2881CodeChef