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- Counting Factorizations1900Codeforcescombinatoricsdivide and conquerdpmath
- Counting Fridays2000Codeforces*special
- Counting Graphs2000Codeforcescombinatoricsdivide and conquerdsugraphs
- Counting Necessary Nodes2000Codeforcesbitmasksdivide and conquergreedyimplementation
- Counting Problem2313CodeChef
- Counting Rectangles is Fun1900Codeforcesbrute forcedivide and conquerdp
- Counting Strings2279CodeChef
- Cow and Fields1900Codeforcesbinary searchdata structuresdfs and similargraphs
- Crazy Robot2000Codeforcesdfs and similargraphs
- Crease Painting2208CodeChef
- Credit Card1900Codeforcesdata structuresdpgreedyimplementation
- Crossword2000Codeforcesimplementation
- Crunching Numbers Just for You1900Codeforces*specialimplementation
- Cube2000Codeforcesbitmasksdfs and similardp
- Cunning Gena1900Codeforcesbitmasksdpgreedysortings
- Cupboard and Balloons1900Codeforcesgeometry
- Cut and Stick2000Codeforcesbinary searchdata structuresgreedyimplementation
- Cute Chef Gift2235CodeChef
- Cutting Game1900Codeforcesbinary searchbrute forcedata structuresimplementation
- Cycle2000Codeforcesdfs and similargraphs
- Cyclic MEX2000Codeforcesdata structuresimplementationmathtwo pointers
- Cyclist Race2316CodeChef
- Cylinder2309CodeChef
- D-Dimensional MST2399CodeChef
- D/D/D1900Codeforcesdfs and similargraphsgreedyshortest paths
- DFS Checker (Easy Version)1900Codeforcesbrute forcedata structuresdfs and similargraphs
- DZY Loves Modification2000Codeforcesbrute forcedata structuresgreedy
- Da Vinci Powers1900Codeforces*special
- Daleks' Invasion (easy)1900Codeforcesgraphstrees
- Dalgona Treat2286CodeChef
- Dance Floor Energy2276CodeChef
- Dances (Hard Version)1900Codeforcesbinary searchgreedysortingstwo pointers
- Dancing Lessons1900Codeforcesdata structures
- Danil and a Part-time Job2000Codeforcesbitmasksdata structurestrees
- Dasha and Nightmares1900Codeforcesbitmaskshashingmeet-in-the-middlestrings
- Dasha and Puzzle2000Codeforcesconstructive algorithmsdfs and similargraphsgreedy
- Data Center Maintenance1900Codeforcesdfs and similargraphs
- Date Change2000Codeforces*special
- Death Stars (medium)2000Codeforceshashingstrings
- Decoding Genome1900Codeforcesdpmatrices
- Decreasing Debts2000Codeforcesconstructive algorithmsdata structuresgraphsgreedy
- Definitely Larger2000Codeforcesbinary searchconstructive algorithmsdata structuresgraphs
- Delete Maximum2301CodeChef
- Delete a Subarray2205CodeChef
- Dense Graph2330CodeChef
- Dense Subsequence1900Codeforcesdata structuresgreedystrings
- Dependency management1900Codeforces*specialgraphsimplementation
- Design Tutorial: Inverse the Problem1900Codeforcesdfs and similardsushortest pathstrees
- Destroy the EMP Chip2357CodeChef
- Destruction of a Tree2000Codeforcesconstructive algorithmsdfs and similardpgreedy
- Devu and good strings2351CodeChef
- Dexterina’s Lab1900Codeforcesgamesmatricesprobabilities
- Diana and Liana1900Codeforcesgreedyimplementationtwo pointers
- Difference Array1900Codeforcesbrute forcedata structuresimplementationsortings
- Different Arrays2000Codeforcesbrute forcedpimplementation
- Digital Root2000Codeforcesnumber theory
- Digits Cannot Separate2371CodeChef
- Digits Forest2217CodeChef
- Digits Permutations1900Codeforcesgreedy
- Dijkstra?1900Codeforcesgraphsshortest paths