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- Cipher3100Codeforcesimplementation
- Circle Coloring3104CodeChef
- Circle Eating2971CodeChef
- Circle of Numbers3000Codeforcesmath
- Circles Are Far from Each Other3100Codeforcesbinary searchgreedy
- Circles of Waiting3100Codeforcesmath
- Circular Permutation Recovery2927CodeChef
- Circular Xor Reversal3000Codeforcesbitmasksconstructive algorithms
- City Mapping 23126CodeChef
- Clacking Balls3100Codeforcescombinatoricsmathprobabilities
- Clamp Paths on Tree4052CodeChef
- Classical?2900Codeforcesbinary searchcombinatoricsnumber theory
- Cleaning Drive2976CodeChef
- Clearing the Snowdrift3100Codeforcesdata structuresdfs and similardpgreedy
- Clique Boolean Expression3160CodeChef
- Clockwork Bomb3200Codeforcesdata structuresdfs and similardsugreedy
- Closer2800Codeforcesdfs and similardptrees
- Closest Pair 2800Codeforcesdata structuresgreedy
- Closest Points3384CodeChef
- Club of Young Aircraft Builders (hard version)2900Codeforcescombinatoricsdpmath
- Clubstep3500Codeforcesbinary searchbrute forcedata structuresgreedy
- Code Lock3300Codeforcesbitmasksdp
- Codeforces Heuristic Contest 10013500Codeforcesconstructive algorithms
- Codeforces Scoreboard3300Codeforcesbinary searchdata structuresdpgeometry
- Coffee Break3500Codeforcesdata structuresgreedymath
- Coffee Varieties (easy version)2800Codeforcesgraphsinteractive
- Coffee Varieties (hard version)3000Codeforcesconstructive algorithmsgraphsinteractive
- Coins Exhibition2900Codeforcesdata structuresdpmath
- Collinear Points3150CodeChef
- Color Difference3027CodeChef
- Color the Tree3500Codeforces*special
- Colorful Polygon3400Codeforcesconstructive algorithmsdivide and conquergeometry
- Colorful Tree (Hard Version)3122CodeChef
- Colorful Tree Again3000Codeforcesbrute forcedata structurestrees
- Coloring Colorable Graphs3012CodeChef
- Colosseum3133CodeChef
- Coloured Pairings3105CodeChef
- Combinatorics Is Fun3096CodeChef
- Combinatorics Is Fun3210CodeChef
- Combining Slimes3300Codeforcesdpmathmatricesprobabilities
- Communication Channel2941CodeChef
- Communism3500Codeforcesbitmasksdptrees
- Company Acquisitions3200Codeforcesconstructive algorithmsmath
- Company Club Membership3289CodeChef
- Compare Suffixes3500Codeforcesinteractive
- Complete the Permutations3400Codeforcescombinatoricsfftgraphsmath
- Complex Segments (Easy Version)3300Codeforcesbinary searchdata structuresdivide and conquerdsu
- Complex Segments (Hard Version)3400Codeforcesbinary searchdata structuresdivide and conquerdsu
- Computer Game3100Codeforcesdpgreedymathprobabilities
- Computer Virus3368CodeChef
- Concat Lexmax Substrs3323CodeChef
- Conditional Operators3200Codeforcesconstructive algorithms
- Conference3300Codeforcesdata structuresflows
- Conference Problem3000Codeforcesdp
- Connect Points3074CodeChef
- Connect The Chains2964CodeChef
- Connect on a Grid (Challenge)3648CodeChef
- Connected Cubes3100Codeforcesconstructive algorithmsgames
- Conquer Beyond the Wall3327CodeChef
- Construct Degree3247CodeChef