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- Harmony Analysis1800Codeforcesconstructive algorithms
- Harry Potter and Three Spells1800Codeforcesimplementationmath
- Harry Potter and the History of Magic1700Codeforcesbrute forcegreedyimplementation
- Headquarters1700Codeforcesconstructive algorithmsmath
- Heidi and Library (easy)1800Codeforcesgreedy
- Heidi and Library (medium)1800Codeforcesdata structuresgreedy
- Help General1800Codeforcesconstructive algorithmsgreedyimplementation
- Help Victoria the Wise1700Codeforcesbrute forceimplementation
- Help the judge2175CodeChef
- Helping the Nature1700Codeforcesconstructive algorithmsdata structuresgreedy
- Heroes of Magical Might2196CodeChef
- Hexakosioihexekontahexaphobia1800Codeforces*special
- Hidden Permutations1700Codeforcesdfs and similarinteractivemath
- High Load1800Codeforcesconstructive algorithmsgreedyimplementationtrees
- Higher Order Functions1700Codeforcesimplementationstrings
- Hills And Valleys1700Codeforcesbrute forceimplementation
- Hiring Staff1800Codeforcesgreedy
- Hit Ball1700Codeforcesgeometryimplementationmath
- Hot Black Hot White1800Codeforcesconstructive algorithmsmath
- How to Repaint a Fence2077CodeChef
- Hyperdrive1800Codeforcesmath
- I'm Feeling Lucky!1800Codeforces*specialprobabilities
- INTERCALC1800Codeforces*specialimplementation
- IQ Test1800Codeforcesimplementation
- Ice Cream1700Codeforces*specialgreedysortings
- Identify the Operations1800Codeforcescombinatoricsdata structuresdsugreedy
- Igor In the Museum1700Codeforcesdfs and similargraphsshortest paths
- Igor and Mountain1800Codeforcesbinary searchbrute forcedp
- Ilya and Escalator1700Codeforcescombinatoricsdpmathprobabilities
- Imbalanced Arrays1800Codeforcesconstructive algorithmsgraphsgreedymath
- Increase 2 consecutive characters2171CodeChef
- Increasing Addition2155CodeChef
- Increasing Subsequence (hard version)1700Codeforcesgreedy
- Increasing Subsequences1800Codeforcesbitmasksconstructive algorithmsdivide and conquergreedy
- Increasing by Modulo1700Codeforcesbinary searchgreedy
- Infinite Fence1700Codeforcesgreedymathnumber theory
- Infinite OR Game2046CodeChef
- Infinite Prefixes1700Codeforcesmathstrings
- Infinite Sequence (Easy Version)1800Codeforcesbitmasksbrute forcedpimplementation
- Infinite Set1800Codeforcesbitmasksdpmathmatrices
- Infinite polygons2075CodeChef
- Integer Sequences2106CodeChef
- Integers Have Friends1800Codeforcesbinary searchdata structuresdivide and conquermath
- Integral Array1800Codeforcesbrute forceconstructive algorithmsdata structuresmath
- Interactive Graph (Simple Version)1800Codeforcesbinary searchcombinatoricsdfs and similardp
- Interesting Array2145CodeChef
- Interesting Array1800Codeforcesconstructive algorithmsdata structurestrees
- Interval Mod1700Codeforcesconstructive algorithmsdpgreedymath
- Introverts2090CodeChef
- Inversion Counting1800Codeforcesbrute forcemath
- Inversion Graph Coloring (Easy Version)1800Codeforcescombinatoricsdata structuresdpgreedy
- Inversion Value of a Permutation1800Codeforcesconstructive algorithmsdfs and similardp
- Inversion sorting2169CodeChef
- Inversions2177CodeChef
- Inversions problem1800Codeforcesbrute forcedfs and similardpmeet-in-the-middle
- Ira and Flamenco1700Codeforcescombinatoricsconstructive algorithmsdata structuresimplementation
- Iris and Game on the Tree1700Codeforcesconstructive algorithmsdfs and similargamesgraphs
- Iris and the Tree1800Codeforcesbrute forcedata structuresdfs and similardsu
- Irreducible Anagrams1800Codeforcesbinary searchconstructive algorithmsdata structuresstrings
- Is This a Zebra?1700Codeforcesimplementation