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- Interval Cliques2343CodeChef
- Interval Game2275CodeChef
- Into Blocks (easy version)2000Codeforcesdata structuresdsugreedyimplementation
- Inversion Queries2341CodeChef
- Invertible Bracket Sequences2000Codeforcesbinary searchcombinatoricsdata structuresdivide and conquer
- Is This JEE2206CodeChef
- Is it uniquely decodable2217CodeChef
- Ithea Plays With Chtholly2000Codeforcesbinary searchconstructive algorithmsgamesgreedy
- Jabber ID1900Codeforcesimplementationstrings
- Jamie and Binary Sequence (changed after round)2000Codeforcesbitmasksgreedymath
- Jeff and Furik1900Codeforcescombinatoricsdpprobabilities
- Jeremy Bearimy2000Codeforcesdfs and similargraphsgreedytrees
- Johnny and Grandmaster1900Codeforcesgreedyimplementationmathsortings
- Joint XOR2398CodeChef
- Joker2000Codeforcesbrute forcegreedyimplementationmath
- JosephLand2245CodeChef
- Journey2000Codeforcesbrute forceconstructive algorithmsimplementation
- Judicious Watching2000Codeforcesbinary searchgreedysortings
- Just multiply2270CodeChef
- Jzzhu and Cities2000Codeforcesgraphsgreedyshortest paths
- K-Subarrays2306CodeChef
- K-beautiful Strings2000Codeforcesbinary searchbrute forceconstructive algorithmsgreedy
- K-good1900Codeforcesconstructive algorithmsmathnumber theory
- K-periodic Garland1900Codeforcesbrute forcedpgreedy
- Kamil and Making a Stream2000Codeforcesmathnumber theorytrees
- Kay and Snowflake1900Codeforcesdata structuresdfs and similardptrees
- Keep the Average High2000Codeforcesdpgreedymath
- Kevin and And2000Codeforcesbitmasksbrute forcedpgreedy
- Kevin and Bipartite Graph2000Codeforcesconstructive algorithmsgraphsgreedy
- Kids' Riddle2000Codeforces*special
- Kilani and the Game1900Codeforcesdfs and similargraphsimplementationshortest paths
- Kill Monsters (Easy Version)2392CodeChef
- King's Puzzle1900Codeforcesconstructive algorithms
- Kira Loves Palindromes2347CodeChef
- Kirei and the Linear Function1900Codeforceshashingmath
- Kirill and Mushrooms1900Codeforcesdata structuressortings
- Kirk and a Binary String (easy version)2000Codeforcesbrute forcegreedystrings
- Knapsack Problem2239CodeChef
- Knights2000Codeforcesgeometrygraphsshortest pathssortings
- Koa and the Beach (Easy Version)1900Codeforcesbrute forcedpgreedy
- Kotlinforces2000Codeforces*specialconstructive algorithmsdp
- Koxia and Game2000Codeforcesconstructive algorithmsdata structuresdfs and similardsu
- Kth Max Subarray2223CodeChef
- Kuroni and the Celebration1900Codeforcesconstructive algorithmsdfs and similarinteractivetrees
- Kyoya and Permutation1900Codeforcesbinary searchcombinatoricsconstructive algorithmsgreedy
- La Vaca Saturno Saturnita1900Codeforcesbinary searchbrute forcemathnumber theory
- LaTeX Expert1900Codeforces
- Lasers Everywhere2396CodeChef
- Last Chance2000Codeforcesdata structuresimplementationstrings
- Leave no Witnesses2249CodeChef
- Leaving Auction2000Codeforcesbinary searchdata structures
- Lemmings2000Codeforcesbinary search
- Lena and Matrix1900Codeforcesdata structuresdpgeometryshortest paths
- Let's Go Hiking1900Codeforcesgamesgreedy
- Let's Play Osu!2000Codeforcesdpmathprobabilities
- Let's Play the Hat?2000Codeforcesbrute forceconstructive algorithmsgreedymath
- Let's Play the Words?1900Codeforcesdata structureshashingimplementationmath
- Letter A2000Codeforcesgeometryimplementation
- Letter Exchange1900Codeforcesconstructive algorithms
- Levko and Array2000Codeforcesbinary searchdp