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- Split Into Two Sets1600Codeforcesdfs and similardsugraphs
- Split a Number1500Codeforcesgreedyimplementationstrings
- Spongebob and Joke1500Codeforcesimplementation
- Sponsor of Your Problems1500Codeforcesdpgreedyimplementationstrings
- Spreadsheet1600Codeforcesimplementationmath
- Spring Cleaning1600Codeforces*specialgreedysortings
- Square and Rectangles1500Codeforcesimplementation
- Squares and not squares1600Codeforcesconstructive algorithmsgreedy
- Squash the Bugs1881CodeChef
- Staircase1600Codeforces*special
- Stairs and Elevators1600Codeforcesbinary search
- Standard Free2play1600Codeforcesdpgreedymath
- Star sky1600Codeforcesdpimplementation
- Stas and the Queue at the Buffet1600Codeforcesgreedymathsortings
- Station Allocation1807CodeChef
- Statistics of Recompressing Videos1600Codeforces*specialdata structuresimplementation
- Statues1500Codeforcesdfs and similar
- Stay or Mirror1600Codeforcesbrute forcedata structuresdpgreedy
- Steady tables1949CodeChef
- Stepan and Vowels1600Codeforces*specialimplementationstrings
- Strange Addition1600Codeforcesbrute forceconstructive algorithmsimplementation
- Strange Function1600Codeforcesmathnumber theory
- Strange Game On Matrix1600Codeforcesgreedytwo pointers
- Strange Matrix1922CodeChef
- Strange Minimization1928CodeChef
- Strange Swaps1909CodeChef
- Strange Test1600Codeforcesbinary searchbitmasksbrute forcedp
- String Deletions1882CodeChef
- String inside out1600Codeforces*special
- Submarine in the Rybinsk Sea (easy edition)1500Codeforcescombinatoricsmathnumber theory
- Subsegment Divisibility 1806CodeChef
- Subsequence Sort1821CodeChef
- Subsequence-Numbers Divisible by 71943CodeChef
- Subset MEX Counting1879CodeChef
- Subset Min Max1983CodeChef
- Subtract 12 Operation1991CodeChef
- Subway1600Codeforcesdfs and similargraphs
- SudokuX1969CodeChef
- Suitable Replacement1500Codeforcesbinary searchgreedyimplementation
- Sum1500Codeforcesmath
- Sum and Product1600Codeforcesbinary searchdata structuresmath
- Sum in the tree1600Codeforcesconstructive algorithmsdfs and similargreedytrees
- Sum of LDS1600Codeforcesbrute forcecombinatoricsdpgreedy
- Sum of Product 21972CodeChef
- Sum on Subarrays1500Codeforcesconstructive algorithmsgreedymath
- Summer Homework1500Codeforcesbrute forcedata structures
- Summing Slopes1899CodeChef
- Sums on Segments1600Codeforcesbinary searchbrute forcedata structuresdp
- Super Hero1824CodeChef
- Super-plane1875CodeChef
- Suspects1600Codeforcesconstructive algorithmsdata structuresimplementation
- Swap Letters1500Codeforcesconstructive algorithmsgreedy
- Swap the numbers1869CodeChef
- Sweets Eating1500Codeforcesdpgreedymathsortings
- Symmetric Difference1600Codeforces*special
- Symmetrical Polygons1500Codeforcesconstructive algorithmsgeometrygreedyimplementation
- Sysadmin Bob1500Codeforcesgreedyimplementationstrings
- System Testing1600Codeforcesimplementation
- TRIPLE PRIMES1893CodeChef
- Table1600Codeforces*specialgreedyimplementationmath