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- Simple Operations2212CodeChef
- Single-use Stones1900Codeforcesbinary searchflowsgreedytwo pointers
- Skills1900Codeforcesbinary searchbrute forcedpgreedy
- Skyscrapers (hard version)1900Codeforcesdata structuresdpgreedy
- Small GCD2000Codeforcesbitmasksbrute forcedpmath
- Small Operations2000Codeforcesbinary searchbrute forcedfs and similardp
- Smallest Beautiful Number2258CodeChef
- Smart Beaver and Resolving Collisions2000Codeforces
- Smart Beaver and Resolving Collisions1900Codeforces
- Smithing Skill1900Codeforcesbrute forcedata structuresdpgreedy
- Social Circles1900Codeforcesgreedymath
- Sofa Thief2000Codeforcesbrute forceimplementation
- Solitaire1900Codeforcesdfs and similardp
- Something with XOR Queries2000Codeforcesbrute forceinteractiveprobabilities
- Space Voyage1900Codeforcesbinary search
- Spanning Tree with One Fixed Degree1900Codeforcesconstructive algorithmsdfs and similardsugraphs
- Special Grid2000Codeforcesbrute forcedpgreedy
- Special Olympics1900Codeforcesgeometry
- Special Permutations2000Codeforcesmath
- Speedbreaker1900Codeforcesbinary searchdata structuresdpgreedy
- Speedrun2304CodeChef
- Spiral Maximum1900Codeforcesbrute forcedp
- Split And Maximize2304CodeChef
- Split Plus K1900Codeforcesgreedymathnumber theory
- Spongebob and Squares1900Codeforcesbrute forcemath
- Spooky Sequences2304CodeChef
- Spy Syndrome 21900Codeforcesdata structuresdphashingimplementation
- Square Subsets2000Codeforcesbitmaskscombinatoricsdpmath
- Square in numbers2337CodeChef
- Stable Mex2245CodeChef
- Stack Sorting2000Codeforcesconstructive algorithmsdata structuresgreedyimplementation
- Stars Drawing (Hard Edition)1900Codeforcesbinary searchdpgreedy
- Start Shift2250CodeChef
- Stepan's Series2000Codeforces*specialdp
- Stepping Numbers2211CodeChef
- Sticky Notes2258CodeChef
- Strange Beauty1900Codeforcesdpmathnumber theorysortings
- Strange Definition1900Codeforcesbitmasksgraphshashingmath
- Strange Device1900Codeforcesconstructive algorithmsinteractivemathsortings
- String Coloring (hard version)2000Codeforcesdata structuresdp
- String Operations2220CodeChef
- String Reversal1900Codeforcesdata structuresgreedystrings
- Strings and Graphs2300CodeChef
- Strip2000Codeforcesbinary searchdata structuresdptwo pointers
- Stripe 22000Codeforcesbinary searchdpsortings
- Sub-RBS (Hard Version)1900Codeforcesdpgamesimplementationstrings
- Subarray Jumps2369CodeChef
- Subarray LCM2277CodeChef
- Submedians (Easy Version)1900Codeforcesbinary searchdata structuresdpgreedy
- Subordinates1900Codeforcesconstructive algorithmsdata structuresgraphsgreedy
- Subsequence Frequency Counting2357CodeChef
- Subsequences1900Codeforcesdata structuresdp
- Subsequences (easy version)2000Codeforcesdpgraphsimplementationshortest paths
- Subsequences (hard version)1900Codeforcesdpstrings
- Subtraction Game2367CodeChef
- Subway Innovation2000Codeforcesgreedymathtwo pointers
- Sum1900Codeforcesgreedymath
- Sum By OR2308CodeChef
- Sum Divides Product2384CodeChef
- Sum Graph2000Codeforcesbrute forceconstructive algorithmsgraphsimplementation