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- Christmas Greetings205CodeChef
- Christmas Trees300CodeChef
- Ciel and A-B Problem1136CodeChef
- Ciel and Receipt936CodeChef
- Cipher Shifer800Codeforcesimplementationstringstwo pointers
- Circle Coloring800Codeforcesconstructive algorithms
- Circle Line800Codeforcesimplementation
- Circle of Apple Trees800Codeforcesgreedysortings
- Circuit800Codeforcesgreedyimplementationmathnumber theory
- Circular Track838CodeChef
- Cirno's Perfect Bitmasks Classroom800Codeforcesbitmasksbrute force
- Clear Day233CodeChef
- Clearance Sale392CodeChef
- Clock Conversion800Codeforcesimplementationmath
- Closest Point800Codeforcesimplementationmath
- Closing The Gap800Codeforcesgreedymath
- Clothing Store947CodeChef
- Cloud Watching167CodeChef
- Cloudberry Jam800Codeforcesmath
- CodeChef Learn Problem Solving287CodeChef
- CodeChef Streak1009CodeChef
- CodeMat183CodeChef
- Codechef Airlines475CodeChef
- Codechef Round232CodeChef
- Codeforces Checking800Codeforcesimplementationstrings
- Coder800Codeforcesimplementation
- Coin Flip1135CodeChef
- Coin Transformation800Codeforcesbrute forcemath
- Coins800Codeforcesgreedyimplementationmath
- Coins800Codeforcesimplementationmath
- Coins And Triangle1075CodeChef
- Coldplay854CodeChef
- Coldplay Tickets292CodeChef
- Collatz Conjecture800Codeforcesconstructive algorithmsmath
- Collecting Coins800Codeforcesmath
- Color Festival588CodeChef
- Colored Balls: Revisited800Codeforcesbrute forcegreedyimplementationsortings
- Colorful Stones (Simplified Edition)800Codeforcesimplementation
- Colour the Flag800Codeforcesbrute forceimplementation
- Colourblindness800Codeforcesimplementation
- Coloured Balloons584CodeChef
- Coloured Orbs273CodeChef
- Combination Lock800Codeforcesimplementation
- Comfortable Seating874CodeChef
- Common Multiple800Codeforcesbrute forcegreedyimplementationmath
- Common Subsequence800Codeforcesbrute force
- Compare T-Shirt Sizes800Codeforcesimplementationstrings
- Competition of 4247CodeChef
- Complementary Strand in a DNA660CodeChef
- Complete the credits809CodeChef
- Complicated GCD800Codeforcesmathnumber theory
- Compote800Codeforcesimplementationmath
- Compress the Video940CodeChef
- Computer Game800Codeforcesbrute forcedfs and similardpimplementation
- Conquer the Fest!!153CodeChef
- Consecutive Sum800Codeforcesgreedysortings
- Consecutive Sum Riddle800Codeforcesmath
- Construct N860CodeChef
- Construct a Rectangle800Codeforcesgeometrymath
- Construct an Array800Codeforcesconstructive algorithms