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- Interstellar battle2200Codeforcesmathprobabilitiestrees
- Interval Game2300Codeforcesbitmaskscombinatoricsconstructive algorithmsdp
- Invariance of Tree2100Codeforcesconstructive algorithmsdfs and similargreedytrees
- Inverse Coloring2100Codeforcescombinatoricsdpmath
- Inverse of Rows and Columns2200Codeforcesbrute forceconstructive algorithms
- Inverse of a Function2502CodeChef
- Inversion Expectation2300Codeforcesdpmathprobabilities
- Inversion Graph Coloring (Hard Version)2200Codeforcesbinary searchcombinatoricsdata structuresdp
- Irrigation2200Codeforcesbinary searchdata structuresimplementationsortings
- Is It Flower?2100Codeforcesdfs and similargraphsimplementation
- Is it Sorted or Not, That is the Question2429CodeChef
- Isomorphic Strings2300Codeforceshashingstrings
- Item World2200Codeforcesbrute forceimplementationsortings
- Ivan the Fool VS Gorynych the Dragon2100Codeforcesdpgamesgraphs
- Jamie and To-do List2200Codeforcesdata structuresinteractivetrees
- Jeff and Permutation2200Codeforcesgreedy
- Jellyfish and EVA2300Codeforcesdpgraphsgreedymath
- Jeremy gets a gift2486CodeChef
- Jerry and Tom2300Codeforcesdata structuresdfs and similardsugames
- Jinx or Jackpot2300Codeforcesbrute forcedpmathprobabilities
- Job Lookup2100Codeforcesconstructive algorithmsdpshortest pathstrees
- Jon and Orbs2200Codeforcesdpmathprobabilities
- Jongmah2200Codeforcesdp
- Journey2300Codeforcesdata structuresdfs and similardsugraphs
- Joy of Pokémon Observation2300Codeforces
- Jumping frogs2100Codeforces*special
- K - Beautiful Permutation2440CodeChef
- K Flip2432CodeChef
- K Integers2300Codeforcesbinary searchdata structures
- K Perfect Matchings2455CodeChef
- K Subarray Products2577CodeChef
- K Subsequence 1012413CodeChef
- K and Medians2200Codeforcesconstructive algorithmsgreedymath
- K-th Path2200Codeforcesbrute forceconstructive algorithmsshortest pathssortings
- Kaavi and Magic Spell2200Codeforcesdpstrings
- Kalila and Dimna in the Logging Industry2100Codeforcesdpgeometry
- Kamal-ol-molk's Painting2100Codeforcesbrute forceconstructive algorithmsgreedy
- Karen and Test2200Codeforcesbrute forcecombinatoricsconstructive algorithmsmath
- Kate and imperfection2200Codeforcesgreedyimplementationmathnumber theory
- Keshi in Search of AmShZ2300Codeforcesgraphsgreedyshortest paths
- Kevin and Binary String (Easy Version)2100Codeforcesgreedyimplementation
- Key Storage2100Codeforcescombinatoricsmath
- Key of Like (Easy Version)2200Codeforcesdpgamesmathprobabilities
- Keyboard Purchase2200Codeforcesbitmasksdp
- Kill Anton2200Codeforcesbrute forceconstructive algorithmsdata structuresmath
- Kill Monsters (Hard Version)2419CodeChef
- Killing Zombies2505CodeChef
- Kindergarten Homework2100Codeforcesimplementationstrings
- King Killing2568CodeChef
- Kingdom Attack2439CodeChef
- Kirill and Company2200Codeforcesbitmasksbrute forcedfs and similardp
- Kirk and a Binary String (hard version)2100Codeforcesdata structuresgreedymathstrings
- Kleofáš and the n-thlon2300Codeforcesdpmathprobabilities
- Knapsack2300Codeforcesdfs and similardpgreedy
- Knight Covering2566CodeChef
- Knitting Batik2200Codeforcesimplementationmath
- Koa and the Beach (Hard Version)2200Codeforcesconstructive algorithmsdpgreedyimplementation
- Kostomuksha and AESC MSU2597CodeChef
- Krillin is dead AGAIN2526CodeChef
- Ksenia and Pawns2200Codeforcesdfs and similargraphsimplementationtrees