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- Ice Sculptures1300Codeforces*specialbrute forcenumber theory
- Ice and Fire1300Codeforcesconstructive algorithmsdpgreedy
- Ilya and Matrix1400Codeforcesconstructive algorithmsgreedyimplementationsortings
- Inaccurate Subsequence Search1400Codeforcesdata structurestwo pointers
- Increase Subarray Sums1400Codeforcesbrute forcedpgreedyimplementation
- Increase and Decrease1300Codeforcesgreedymath
- Increasing Sequence with Fixed OR1300Codeforcesbitmasksconstructive algorithmsgreedy
- Increasing Subsequence (easy version)1300Codeforcesgreedy
- Increasing Windows1681CodeChef
- Incremental Path1300Codeforcesdata structureshashingimplementation
- Incremental Stay1400Codeforcesgreedyimplementationmath
- Inflation1300Codeforcesbinary searchbrute forcegreedymath
- Ingenuity-21400Codeforcesconstructive algorithmsgreedyimplementation
- Inhabitant of the Deep Sea1300Codeforcesgreedyimplementationmath
- Insane Problem1300Codeforcesbinary searchgreedyimplementationmath
- Inscribed Figures1400Codeforcesgeometry
- Insert Zero and Invert Prefix1300Codeforcesconstructive algorithms
- Insert and Equalize1300Codeforcesbrute forceconstructive algorithmsgreedymath
- Intense Heat1300Codeforcesbrute forceimplementationmath
- Interesting Ratio1300Codeforcesbrute forcemathnumber theorytwo pointers
- Interview1300Codeforcesbinary searchimplementationinteractive
- Inversion Graph1300Codeforcesdata structuresdsugraphsmath
- Iron, Magnet and Wall1725CodeChef
- Island Puzzle1300Codeforcesconstructive algorithmsimplementation
- It All Went Sideways1400Codeforcesbinary searchdata structuresdpgreedy
- Iva & Pav1400Codeforcesbinary searchbitmasksdata structuresgreedy
- Jatayu's Balanced Bracket Sequence1300Codeforcesdata structuresdsugraphsgreedy
- Jeff and Periods1300Codeforcesimplementationsortings
- Jellyfish and Green Apple1400Codeforcesbitmasksgreedymathnumber theory
- Jeopardy!1400Codeforcesgreedymath
- Johnny and Another Rating Drop1400Codeforcesbitmasksgreedymath
- Johnny and the Beanstalk1616CodeChef
- Journey Planning1400Codeforcesdata structuresdpgreedymath
- Jumping Through Segments1400Codeforcesbinary searchconstructive algorithms
- Jumping on Walls1400Codeforcesshortest paths
- Just Eat It!1300Codeforcesdpgreedyimplementation
- Just a Graph1659CodeChef
- Jzzhu and Sequences1300Codeforcesimplementationmath
- K Odd Sum1614CodeChef
- K for the Price of One (Easy Version)1400Codeforcesdpgreedysortings
- K-Concatenation1780CodeChef
- K-Dominant Character1400Codeforcesbinary searchimplementationtwo pointers
- K-Foldable String1742CodeChef
- K-Subarrays1663CodeChef
- K-special Tables1300Codeforcesconstructive algorithmsimplementation
- K-th Beautiful String1300Codeforcesbinary searchbrute forcecombinatoricsimplementation
- Kanade's Perfect Multiples1400Codeforcesbrute forceconstructive algorithmsgreedynumber theory
- Kar Salesman1300Codeforcesbinary searchgreedymath
- Karen and Coffee1400Codeforcesbinary searchdata structuresimplementation
- Kill `Em All1300Codeforcesgreedysortings
- King of Thieves1300Codeforcesbrute forceimplementation
- Kirei Attacks the Estate1400Codeforcesdfs and similardpgreedytrees
- Klee's SUPER DUPER LARGE Array!!!1400Codeforcesbinary searchmathternary search
- Klever Permutation1400Codeforcesconstructive algorithmsmathtwo pointers
- Knapsack1300Codeforcesconstructive algorithmsgreedysortings
- Knights of a Polygonal Table1400Codeforcesgreedyimplementationsortings
- Koala and Lights1300Codeforcesimplementationmathnumber theory
- Kousuke's Assignment1300Codeforcesdata structuresdpdsugreedy
- LCM1400Codeforces*specialimplementationmath
- LIS or Reverse LIS?1400Codeforcesconstructive algorithmsgreedyimplementationmath