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- Hidden Fortress2100Codeforcesinteractivemath
- High Cry2200Codeforcesbinary searchbitmaskscombinatoricsdata structures
- High Score (Hard Version)2418CodeChef
- Hiking2300Codeforcesbinary searchdp
- Hill Climbing2200Codeforcesdfs and similargeometrytrees
- Hill Jumping2581CodeChef
- Hiring Chefs2584CodeChef
- Hit the Coconuts2491CodeChef
- Holiday Wall Ornaments2200Codeforcesdpstrings
- Hopscotch2568CodeChef
- Horseback Riding2300Codeforcesflowsgraphs
- Hospital Queue2200Codeforcesbinary searchgraphsgreedyimplementation
- Hossam and (sub-)palindromic tree2100Codeforcesbrute forcedata structuresdfs and similardp
- Hostname Aliases2100Codeforces*specialbinary searchdata structuresimplementation
- Hot Start Up (hard version)2100Codeforcesdata structuresdp
- Hotel Balifornia2419CodeChef
- How Many Paths?2100Codeforcesdfs and similardpgraphstrees
- How Many Squares?2200Codeforcesimplementation
- How many arrays2475CodeChef
- How to Write a Message2501CodeChef
- Huge Grid (Hard Version)2518CodeChef
- Huge Strings2200Codeforcesbitmasksbrute forcedpimplementation
- Hungarian Notation2200Codeforces*special
- Hyakugoku and Ladders2300Codeforcesdpprobabilitiesshortest paths
- Hyperspace Highways2300Codeforcesdfs and similargraphstrees
- I Love Balls2300Codeforcescombinatoricsmathprobabilities
- I've Been Flipping Numbers for 300 Years and Calculated the Sum2200Codeforcesbinary searchbrute forcecombinatoricsdivide and conquer
- INI-file2200Codeforces*specialimplementation
- Ice Baby2300Codeforcesbinary searchbrute forcedata structuresdp
- Ice cream coloring2200Codeforcesconstructive algorithmsdfs and similargreedy
- Icing Crowns2540CodeChef
- Idiot First Search and Queries2300Codeforcesbinary searchdata structuresdpgraphs
- Illusions of the Desert2300Codeforcesdata structurestrees
- Ilya and Roads2100Codeforcesdp
- Ilya and Two Numbers2300Codeforcesconstructive algorithmsdata structuresdsugreedy
- Imagination Castle2300Codeforcesdpgamestwo pointers
- In Search of Truth (Easy Version)2200Codeforcesconstructive algorithmsinteractivemathmeet-in-the-middle
- Increase Sequence2100Codeforcescombinatoricsdp
- Increasing String 2479CodeChef
- Increasing XOR Queries2519CodeChef
- Infinite Card Game2300Codeforcesbinary searchbrute forcedata structuresdfs and similar
- Infinite Graph2596CodeChef
- Infinite Inversions2100Codeforcesbinary searchdata structuresimplementationsortings
- Infinite Path2200Codeforcesbrute forcedfs and similargraphsmath
- Information Graph2100Codeforcesdfs and similardsugraphstrees
- Ingredients2460CodeChef
- Inna and Binary Logic2100Codeforcesbinary searchbitmasksdata structures
- Inquisition2300Codeforcesgeometryimplementationsortings
- Insanely Hard School Exams2423CodeChef
- Instant Noodles2300Codeforcesgraphshashingmathnumber theory
- Integer concatenation2436CodeChef
- Intellectual Inquiry2200Codeforcesdpgreedystrings
- Interactive RBS (Hard Version)2300Codeforcesbinary searchbitmasksconstructive algorithmsdp
- Interactive Treasure Hunt2200Codeforcesbrute forceconstructive algorithmsgeometryinteractive
- Interest Accumulation2445CodeChef
- Interestring graph and Apples2300Codeforcesdfs and similardsugraphs
- Interrogating Gangsters2444CodeChef
- Intersecting Intervals (Hard)2478CodeChef
- Intersecting Paths2482CodeChef
- Intersection and Union2300Codeforcesdata structuresdpmatricesprobabilities