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- Heaps2600Codeforcesdptrees
- Heavy-Light Decomposition2791CodeChef
- Heavy-light Decompositions2632CodeChef
- Heidi and Library (hard)2600Codeforcesflowsgraphs
- Help Chef2859CodeChef
- Help Greg the Dwarf2500Codeforcesgeometryternary search
- Help Monks2500Codeforcesconstructive algorithms
- Help Shrek and Donkey2700Codeforcesdpgamesmathprobabilities
- Help Shrek and Donkey 22600Codeforcesgames
- Help the DJ2897CodeChef
- Helper2600Codeforces
- Helping People2600Codeforcesdpprobabilities
- Heroes of Making Magic III2600Codeforcesdata structures
- Hidden Colored Graph2626CodeChef
- Hidden Sequence2782CodeChef
- Hidden Single (Version 1)2600Codeforcesdivide and conquerinteractivemathprobabilities
- Hide-and-Seek2400Codeforcesgeometryimplementation
- Hobbits2500Codeforcesbinary searchgeometry
- Holes2700Codeforcesdata structuresdsu
- Hongcow Buys a Deck of Cards2400Codeforcesbitmasksbrute forcedp
- Horse Races2500Codeforcesdpmath
- Hossam and Range Minimum Query2500Codeforcesbinary searchbitmasksdata structureshashing
- Hossam and a Letter2500Codeforcesbrute forcedpimplementationtwo pointers
- Hot and Cold2600Codeforcesbinary searchinteractive
- Hot is Cold2400Codeforcesbitmasksdata structuresdivide and conquerimplementation
- House Planning2400Codeforcesconstructive algorithmsdata structuresgraph matchingsgreedy
- How many sequences2780CodeChef
- How to Choose a Subset2882CodeChef
- How to Learn You Score2600Codeforcesconstructive algorithmsinteractive
- Hyper String2500Codeforcesdp
- Hypercatapult Commute2400Codeforcesgraphs
- Hyperregular Bracket Strings2400Codeforcescombinatoricsgreedyhashingmath
- Hyperspace Jump (hard)2700Codeforces
- Hypertrees2837CodeChef
- I Wanna be the Team Leader2400Codeforcesbitmasksconstructive algorithmsdpgreedy
- I Yearned For The Mines2500Codeforcesconstructive algorithmsdfs and similardpgreedy
- Iahub and Xors2500Codeforcesdata structures
- Ideal Farm2400Codeforcesconstructive algorithmsmath
- Igloo Skyscraper2500Codeforcesdata structuresgeometry
- Igor and Interesting Numbers2500Codeforcesbrute forcecombinatoricsdpmath
- Illumination2700Codeforcesbinary searchbitmasksbrute forcecombinatorics
- Imbalance Value of a Tree2400Codeforcesdata structuresdsugraphstrees
- In Search of Truth (Hard Version)2500Codeforcesconstructive algorithmsinteractivemathmeet-in-the-middle
- In The Green Zone2886CodeChef
- In-tree-active Node Coloring2762CodeChef
- Ina of the Mountain2400Codeforcesdata structuresdpgreedymath
- Incessant Rain2500Codeforcesdata structuresdivide and conquersortings
- Increasing Xor2700Codeforcesbitmasksdata structuresmath
- Independent Set2500Codeforcesdfs and similardptrees
- Independent Set2697CodeChef
- Indie Album2700Codeforcesdata structuresdfs and similarhashingstring suffix structures
- Infinite Sequence (Hard Version)2500Codeforcesbitmasksbrute forceconstructive algorithmsdata structures
- Information Reform2700Codeforcesdpimplementationtrees
- Inna and Babies2600Codeforcesbinary searchdata structuresdsugeometry
- Integer Game2600Codeforcesconstructive algorithmsgamesinteractivemath
- Interactive Bulls and Cows (Hard)2500Codeforcesbrute forceconstructive algorithmsinteractive
- Interactive Equivalency2637CodeChef
- Interactive Factorial Guessing2500Codeforcesbrute forcegamesimplementationinteractive
- Interactive Game with Coloring2400Codeforcesbrute forceconstructive algorithmsdfs and similargraphs
- Interactive MST2829CodeChef