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- Constrained Chopping2185CodeChef
- Constructing Tests1700Codeforcesbinary searchbrute forceconstructive algorithms
- Contest Balloons1800Codeforcesdata structuresgreedy
- Continued Fractions1700Codeforcesbrute forceimplementationmath
- Convex Shape1700Codeforcesconstructive algorithmsimplementation
- Cooking Schedule2081CodeChef
- Copy String1800Codeforcesgreedyimplementationstringstwo pointers
- Corporation Mail1700Codeforcesdata structuresexpression parsingimplementation
- Correct Bracket Sequence Editor1700Codeforcesdata structuresdsustrings
- Correct Placement1700Codeforcesbinary searchdata structuresdpsortings
- Correcting Mistakes1800Codeforcesconstructive algorithmsdpgreedyhashing
- Cosine Partition Function2097CodeChef
- Cost of Tree1800Codeforcesdpgreedytrees
- Count Arrays2009CodeChef
- Count GCD1800Codeforcescombinatoricsmathnumber theory
- Count Substrings2105CodeChef
- Count The Blocks1800Codeforcescombinatoricsdpmath
- Count Triangles1800Codeforcesbinary searchimplementationmathtwo pointers
- Count Triplets2011CodeChef
- Count the Arrays1700Codeforcescombinatoricsmath
- Counting LCM (Hard)2168CodeChef
- Counting Terms2044CodeChef
- Cover it!1700Codeforcesdfs and similardsugraphsshortest paths
- Covered Points Count1700Codeforcesdata structuresimplementationsortings
- Cow Program1700Codeforcesdfs and similardpgraphs
- Cow and Snacks1700Codeforcesdfs and similardsugraphs
- Cracking the Code2038CodeChef
- Crafty Coloring (Easy)2199CodeChef
- Crazy Diamond1700Codeforcesconstructive algorithmssortings
- Crazy Subsequences2111CodeChef
- Crazy Substrings2126CodeChef
- Crazy Town1700Codeforcesgeometry
- Creative Snap1700Codeforcesbinary searchbrute forcedivide and conquermath
- Cross Coloring1700Codeforcesdata structuresimplementationmath
- Cube Cakes2081CodeChef
- Cubes1800Codeforcesbinary searchdptwo pointers
- Cut and Paste1700Codeforcesimplementationmath
- Cute Subsequences1800Codeforces*specialsortings
- Cutting Figure1700Codeforcesconstructive algorithmsgraphstrees
- Cutting Jigsaw Puzzle1800Codeforceshashingimplementation
- Cutting Plants2172CodeChef
- Cycle In Maze1700Codeforces*specialdfs and similargraphsgreedy
- Cycle in Graph1800Codeforcesdfs and similargraphs
- Cyclic Operations1800Codeforcesbrute forceconstructive algorithmsdfs and similargraphs
- Cyclic Rotation1700Codeforcesconstructive algorithmsgreedyimplementationtwo pointers
- D - Pilgrims Destination2170CodeChef
- Dark Assembly1800Codeforcesbrute forceprobabilities
- Dasha and Very Difficult Problem1700Codeforcesbinary searchbrute forceconstructive algorithmsgreedy
- Date calculation1800Codeforces*special
- Defragmentation1800Codeforcesimplementation
- Deleting Divisors1700Codeforcesgamesmathnumber theory
- Demonstration1700Codeforcesgreedy
- Desktop Rearrangement1800Codeforcesdata structuresgreedyimplementation
- Destroying Bridges Part 22005CodeChef
- Deutsch-Jozsa algorithm1700Codeforces*special
- Devu And Churu 2139CodeChef
- Devu and Partitioning of the Array1700Codeforcesbrute forceconstructive algorithmsimplementationnumber theory
- Devu and his Brother1700Codeforcesbinary searchsortingsternary searchtwo pointers
- Devu and his Class2007CodeChef
- Diane1800Codeforcesconstructive algorithmsgreedystrings