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- Interactive Tree2822CodeChef
- Interesting Problem (Easy Version)2500Codeforcesdp
- Interesting Problem (Hard Version)2600Codeforcesdp
- Interesting Sequence2600Codeforcesmath
- Intergalaxy Trips2700Codeforcesprobabilitiesshortest paths
- Intersection of Permutations2400Codeforcesdata structures
- Interval Coloring2400Codeforces*specialgreedymath
- Interval Cubing2600Codeforcesdata structuresmath
- Interval-Free Permutations2600Codeforcescombinatorics
- Intriguing Selection2600Codeforcesbrute forceconstructive algorithmsimplementationinteractive
- Inverse Function2400Codeforcesimplementation
- Inverse Minimum Partition (Easy Version)2500Codeforcesbinary searchbrute forcedpgeometry
- Inverse Problem2700Codeforces*specialcombinatoricsdp
- Inverse Transformation2500Codeforcesconstructive algorithmsimplementationmath
- Inversion Composition2500Codeforcesconstructive algorithmsdata structuresgreedy
- Inversion SwapSort2500Codeforcesconstructive algorithmsgreedysortings
- Inversions After Shuffle2400Codeforcesdata structuresprobabilities
- Inversions in Permutations2866CodeChef
- Inversions problem2400Codeforcesdpprobabilities
- Invincible Shield2882CodeChef
- Iris and Adjacent Products2600Codeforcesdata structuresgreedyimplementationmath
- Is It Rated?2700Codeforcesgreedyinteractivemathprobabilities
- Is This a Long Challenge2664CodeChef
- Is it Obvious2833CodeChef
- Isla's Memory Thresholds2600Codeforcesbinary searchbrute forcedata structuresdivide and conquer
- It's a bird! No, it's a plane! No, it's AaParsa!2500Codeforcesconstructive algorithmsgraphsshortest paths
- Italian Data Centers2500Codeforcesgraphsshortest paths
- Ivan Pesic and His World Tour2756CodeChef
- Ivan and Burgers2500Codeforcesdata structuresdivide and conquergreedymath
- Jam2746CodeChef
- Jamie and Tree2400Codeforcesdata structurestrees
- Jammer2500Codeforces*specialmath
- Japanese Game2700Codeforcesconstructive algorithmsmath
- Jee, You See?2400Codeforcesbitmaskscombinatoricsdp
- Jeff and Brackets2500Codeforcesdpmatrices
- Jeff and Removing Periods2700Codeforcesdata structures
- Jellyfish and Math2400Codeforcesbitmasksbrute forcedfs and similardp
- Jog Around The Graph2700Codeforcesbinary searchdpgeometrygraphs
- Johnny Solving2700Codeforcesconstructive algorithmsdfs and similargraphsmath
- Johnny and Megan's Necklace2500Codeforcesbinary searchbitmasksconstructive algorithmsdfs and similar
- Joined Subarrays on Tree2877CodeChef
- Joking (Easy Version)2500Codeforcesbinary searchconstructive algorithmsinteractiveternary search
- Josuke and Complete Graph2400Codeforcesbinary searchbrute forcedata structuresmath
- Journey2500Codeforcesdpmath
- Journey2500Codeforcesdptrees
- Juju and Binary String2700Codeforcesbrute forceconstructive algorithmsgreedymath
- Jump mission2859CodeChef
- Jumping Around2700Codeforcesbinary searchdata structuresdivide and conquerdp
- Jumping Man2500Codeforcesbrute forcecombinatoricsdfs and similardp
- Jumping Transformers2600Codeforcesdp
- Jzzhu and Apples2500Codeforcesconstructive algorithmsnumber theory
- Jzzhu and Numbers2400Codeforcesbitmaskscombinatoricsdp
- K - Magical String2730CodeChef
- K Forests2734CodeChef
- K-Beautiful Subarrays2753CodeChef
- K-Set Tree2500Codeforcescombinatoricsdfs and similardpmath
- Karen and Supermarket2400Codeforcesbrute forcedptrees
- Katya and Segments Sets2400Codeforcesdata structuresinteractivesortings
- Kay and Eternity2600Codeforcesbrute forceimplementationsortings
- Keen Tree Calculation2500Codeforcesbinary searchdata structuresdpgeometry