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- Chicken or Fish?2100Codeforcesgreedy
- Chip 'n Dale Rescue Rangers2100Codeforcesbinary searchgeometrymath
- Chip Play2300Codeforcesbrute forcedata structuresimplementation
- Chips2300Codeforcesconstructive algorithmsimplementation
- Chris and Road2100Codeforcesgeometryimplementation
- Christmas Reindeer (easy version)2300Codeforcesbitmasksbrute forcecombinatoricsdp
- Ciel and Battle Arena2569CodeChef
- Ciel and Quiz Game2460CodeChef
- Ciel and a new island2443CodeChef
- Ciel the Commander2100Codeforcesconstructive algorithmsdfs and similardivide and conquergreedy
- Circular RMQ2200Codeforcesdata structures
- City Union2300Codeforcesconstructive algorithmsdfs and similardsugeometry
- Civilization2100Codeforcesdfs and similardpdsuternary search
- Cleaning2200Codeforcesdata structuresdpgreedymath
- Cleaning Robots2300Codeforcesdptrees
- Clear The Matrix2200Codeforcesbitmasksdp
- Clear the Multiset2200Codeforcesdata structuresdivide and conquerdpgreedy
- Clearing Up2300Codeforcesconstructive algorithmsdpdsugraphs
- Clique Partition2100Codeforcesbrute forceconstructive algorithmsgraphsgreedy
- Cloning2507CodeChef
- Codechef Password Recovery2450CodeChef
- Coin Troubles2100Codeforcesdp
- Collective Mindsets (medium)2300Codeforces
- College Admissions2496CodeChef
- Colorado Potato Beetle2200Codeforcesdfs and similarimplementation
- Colored Domino Tilings and Cuts2489CodeChef
- Colorful Points2100Codeforcesdata structuresgreedyimplementation
- Coloring Edges2100Codeforcesconstructive algorithmsdfs and similargraphs
- Coloring a Red Black Tree2300Codeforcesdfs and similardpgreedymath
- Colorings and Dominoes2100Codeforcescombinatoricsdpgreedymath
- Colors and Intervals2300Codeforcesconstructive algorithmsdata structuresgreedysortings
- Columns Swaps2300Codeforces2-satdfs and similardsugraphs
- Combinatorics Problem2200Codeforcesbrute forcecombinatoricsdp
- Common Ancestors2539CodeChef
- Common Generator2100Codeforcesbrute forceconstructive algorithmsmathnumber theory
- Common Number2100Codeforcesbinary searchcombinatoricsdpmath
- Common ancestor2300Codeforcesdp
- Company2300Codeforcesbinary searchdata structuresdfs and similargreedy
- Company and Club Hierarchies2564CodeChef
- Comparable Permutations2300Codeforcesgreedyimplementationinteractivesortings
- Compartments2100Codeforcescombinatoricsconstructive algorithmsgreedyimplementation
- Compatible Numbers2200Codeforcesbitmasksbrute forcedfs and similardp
- Competition2200Codeforcesdata structuresgreedy
- Complement Spanning Trees2575CodeChef
- Complete The Graph2300Codeforcesbinary searchconstructive algorithmsgraphsshortest paths
- Complete the Projects (easy version)2100Codeforcesgreedy
- Complete the Projects (hard version)2300Codeforcesdpgreedy
- Completing favorite game2512CodeChef
- Completion (Hard)2445CodeChef
- Complex Spanning Tree2437CodeChef
- Composing Of String2300Codeforces*specialdp
- Compress String2100Codeforcesdpstrings
- Compressed String2497CodeChef
- Compressed Tree2200Codeforcesdfs and similardpgraphsgreedy
- Computer Network2512CodeChef
- Concurrent Lines2535CodeChef
- Condorcet Elections2300Codeforcesconstructive algorithmsgraphsgreedyprobabilities
- Congruence Equation2100Codeforceschinese remainder theoremmathnumber theory
- Connect All Cities2417CodeChef
- Connected Components?2100Codeforcesdata structuresdfs and similardsugraphs