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- Square Root of LCA Convolution2701CodeChef
- Square Sort2728CodeChef
- Square Table2400Codeforcesconstructive algorithmsmathprobabilities
- Square-Free Division (hard version)2500Codeforcesdata structuresdpgreedymath
- Stack Exterminable Arrays2600Codeforcesdata structuresdivide and conquerdphashing
- Stairs and Lines2700Codeforcesdpmatrices
- Star Map2700Codeforcesconstructive algorithmsdata structuresgeometrygreedy
- Star Trek2600Codeforces*specialcombinatoricsdfs and similardp
- Stardew Valley2500Codeforcesconstructive algorithmsdfs and similargraphstrees
- Startup Funding2400Codeforcesbinary searchconstructive algorithmsdata structuresprobabilities
- Statues2700Codeforcesconstructive algorithmsgreedymath
- Stepping Average2723CodeChef
- Sticks2691CodeChef
- Stop Gaming (Easy Version)2500Codeforcesbrute forceconstructive algorithmsgreedyhashing
- Store2700Codeforcesdata structures
- Strange Addition2600Codeforcesdata structuresdpmatrices
- Strange Array2600Codeforcesdata structuresgreedysortings
- Strange Bitwise Operation2870CodeChef
- Strange Calculation and Cats2400Codeforcesdpmatrices
- Strange Function2500Codeforcesbinary searchdata structuresdpgreedy
- Strange Instructions2700Codeforcesdata structuresgreedyimplementation
- Strange LCS2600Codeforcesbitmasksdpgraphsgreedy
- Strange Radiation2500Codeforcesbinary searchimplementationmath
- Strange Set2700Codeforcesflowsmath
- Strange Shuffle2500Codeforcesbinary searchbrute forceconstructive algorithmsinteractive
- Strange Sorting2600Codeforcesimplementationmath
- Stranger Trees2600Codeforcesdpmathmatricestrees
- String Break2875CodeChef
- String Compression2400Codeforcesdphashingstring suffix structuresstrings
- String Counting2700Codeforcescombinatoricsdpfftmath
- String Cutting2600Codeforcesbinary searchbrute forcegreedyhashing
- String Matching2708CodeChef
- String Set Queries2400Codeforcesbrute forcedata structureshashinginteractive
- String Transformation2500Codeforceshashingstrings
- Stringforces2500Codeforcesbinary searchbitmasksbrute forcedp
- Stringology is Magic2769CodeChef
- Stripe, Token and Two Players2700Codeforcesdata structuresdpgames
- Strongly Connected City 22700Codeforcesdfs and similar
- Students Initiation2400Codeforcesbinary searchflowsgraphs
- Sub-Array With Maximum Sum2786CodeChef
- Subarray Cuts2700Codeforcesdp
- Subarray Cuts2600Codeforcesdp
- Subarray Game2699CodeChef
- Subarray Sorting2400Codeforcesdata structuressortings
- Subarray Split (Easy)2800CodeChef
- Subarray Sum2636CodeChef
- Subarray Weight2645CodeChef
- Submedians (Hard Version)2600Codeforcesbinary searchconstructive algorithmsdata structuresmath
- Subsequence2774CodeChef
- Subsequence LCS2743CodeChef
- Subsequence Problem2700Codeforcescombinatoricsdpfftmath
- Subsequences Galore2400Codeforcesbitmaskscombinatoricsdp
- Subset Numbering2640CodeChef
- Subset Sums2500Codeforcesbrute forcedata structures
- Subset with Zero Sum2700Codeforcesconstructive algorithmsdfs and similargraphsmath
- Substring Query2719CodeChef
- Substrings and Repetitions2691CodeChef
- Substrings on a Tree2883CodeChef
- Subtangle Game (Hard Version)2500Codeforcesdata structuresdpgamesgreedy
- Subtraction Sequence I2640CodeChef