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- Creating a Schedule1400Codeforcesconstructive algorithmsdata structuresgreedyimplementation
- Crossing Blocks1762CodeChef
- Crushed Apples and a Balance Scale1736CodeChef
- Crystal Ball Sequence1400Codeforces*specialimplementation
- Cubes for Masha1300Codeforcesbrute forceimplementation
- Cut Ribbon1300Codeforcesbrute forcedp
- Cutting Banner1400Codeforcesbrute forceimplementation
- Cybalphabit1771CodeChef
- Cyclic Merging1300Codeforcesconstructive algorithmsgreedy
- Cyclic XOR1663CodeChef
- DDoS1400Codeforces*specialbrute force
- DIY1400Codeforcesdata structuresgeometrygreedysortings
- DZY Loves Chemistry1400Codeforcesdfs and similardsugreedy
- Dances (Easy version)1400Codeforcesbinary searchgreedytwo pointers
- Dasha and friends1300Codeforcesbrute forceimplementationmath
- Datatypes1400Codeforcesmathsortings
- Death Stars (easy)1400Codeforcesimplementation
- Decomposition Reaction1632CodeChef
- Deep Down Below1300Codeforcesbinary searchgreedysortings
- Delete Them1300Codeforcesconstructive algorithmsimplementation
- Delivery Boy1616CodeChef
- Design Tutorial: Learn from Life1300Codeforces
- Design Tutorial: Make It Nondeterministic1400Codeforcesgreedy
- Developing Skills1400Codeforcesimplementationmathsortings
- Devu and Perfume1708CodeChef
- DevuLand, Dinosaurs and Laddus1683CodeChef
- Di-visible Confusion1300Codeforcesconstructive algorithmsmathnumber theory
- Difference Row1300Codeforcesconstructive algorithmsimplementationsortings
- Different String1612CodeChef
- Digit Operation1798CodeChef
- Digit Removal1754CodeChef
- Digit Rotation1787CodeChef
- Digital Logarithm1400Codeforcesdata structuresgreedysortings
- Digital string maximization1300Codeforcesbrute forcegreedymathstrings
- Dima and Continuous Line1400Codeforcesbrute forceimplementation
- Dima and Sequence1400Codeforcesimplementationmath
- Dinner by Candlelight1647CodeChef
- Directional Increase1300Codeforcesgreedy
- Disappearing Permutation1300Codeforcesdfs and similardpdsugraphs
- Disjoint Non-Decreasing Array1754CodeChef
- Distinct Elements1762CodeChef
- Distinct Fun1628CodeChef
- Distinct Pairs1699CodeChef
- Distinct Power1699CodeChef
- Distinguish multi-qubit basis states1300Codeforces*special
- Distinguish plus state and minus state1400Codeforces*special
- Distinguish zero state and W state1300Codeforces*special
- Distribute idlis Equally1762CodeChef
- Diverse Garland1400Codeforcesconstructive algorithmsdpgreedy
- Diverse Matrix1400Codeforcesconstructive algorithmsgreedymathnumber theory
- Diverse Substrings1400Codeforcesbrute forceimplementationstrings
- Divide and Equalize1300Codeforcesmathnumber theory
- Divide by three, multiply by two1400Codeforcesdfs and similarmathsortings
- Dividing the numbers1300Codeforcesconstructive algorithmsgraphsmath
- Divine Tree1400Codeforcesconstructive algorithmsgreedymathsortings
- Divisible By 81660CodeChef
- Divisible Pairs1300Codeforcescombinatoricsmathnumber theory
- Divisiblity of Differences1300Codeforcesimplementationmathnumber theory
- Divisor Chain1300Codeforcesbitmasksconstructive algorithmsmathnumber theory
- Dominant Character1400Codeforcesbrute forcegreedyimplementationstrings