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- Solo mid Oracle2100Codeforcesgreedymathternary search
- Songwriter2200Codeforcesgreedytwo pointers
- Sonya and Informatics2300Codeforcescombinatoricsdpmatricesprobabilities
- Sonya and Matrix2300Codeforcesbrute forceconstructive algorithmsimplementation
- Sonya and Problem Wihtout a Legend2300Codeforcesdpsortings
- Sort Perm2466CodeChef
- Sorted Distances2592CodeChef
- Sorting Array2509CodeChef
- Sorting Pancakes2300Codeforcesdp
- Sorting Vases2574CodeChef
- Space Harbour2100Codeforcesdata structuresimplementationmathsortings
- Space Rescuers2100Codeforcesgeometryternary search
- Spaceship Solitaire2100Codeforcesdata structuresgreedyimplementation
- Special Matrices2100Codeforcescombinatoricsdp
- Special Operation2430CodeChef
- Special Segments of Permutation2200Codeforcesdata structuresdivide and conquerdsutwo pointers
- Speedrun2100Codeforcesbrute forcedfs and similardpgraphs
- Spring cleaning2300Codeforces*specialdata structuresdfs and similargraphs
- Square Equation Roots2300Codeforcesmath
- Square Function2481CodeChef
- Square Root of Permutation2200Codeforcescombinatoricsconstructive algorithmsdfs and similargraphs
- Square Submatrices2501CodeChef
- Square Tiling2300Codeforcesconstructive algorithmsgreedy
- Squares Counting2465CodeChef
- Squarified2470CodeChef
- Stack Of Rectangles2587CodeChef
- Staircases2100Codeforcesbrute forcecombinatoricsdata structuresdfs and similar
- Star MST2200Codeforcescombinatoricsdpgraph matchingsmath
- Stars2300Codeforcesconstructive algorithmsgeometry
- Start Shift (Hard)2537CodeChef
- Start of the session2100Codeforcesconstructive algorithms
- Steps to One2300Codeforcesdpmathnumber theoryprobabilities
- Stingy Arrays2537CodeChef
- Strange Housing2200Codeforcesconstructive algorithmsdfs and similargraph matchingsgraphs
- Strange Nim Game2445CodeChef
- Strange Operation (Easy Version)2200Codeforcesbrute forcedata structuresgreedyimplementation
- Strange town2300Codeforcesconstructive algorithmsmath
- Streets and Avenues in Berhattan2300Codeforcesdp
- Stressful Training2300Codeforcesbinary searchgreedy
- Strictly Positive Matrix2200Codeforcesgraphsmath
- String2300Codeforcesstring suffix structures
- String2100Codeforcesbrute forceconstructive algorithmshashingimplementation
- String Mark2100Codeforcescombinatoricsmathstrings
- String Multiplication2300Codeforcesdpgreedystrings
- Students' Revenge2200Codeforcesdata structuresgreedysortings
- Students-Far From Hostel2441CodeChef
- Subarray ORs2424CodeChef
- Subsequence LCM2527CodeChef
- Subsequences of Length Two2100Codeforcesdpstrings
- Substitutes in Number2100Codeforcesdp
- Substring Probability2592CodeChef
- Subtangle Game (Easy Version)2100Codeforcesdpgamesgreedyimplementation
- Subtree Domination2507CodeChef
- Subtree Minimum Query2300Codeforcesdata structurestrees
- Subway Pursuit2100Codeforcesbinary searchinteractiveprobabilities
- Suffix Subgroup2200Codeforces*specialstrings
- Suggested Friends2200Codeforcesbrute forcegraphs
- Sum Over Subarrays2555CodeChef
- Sum Over Zero2200Codeforcesdata structuresdfs and similardp
- Sum Queries?2300Codeforcesdata structuresgreedyimplementationmath