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- Keep Magnets Separated2709CodeChef
- Keep the Sum2600Codeforcesconstructive algorithmsimplementationtwo pointers
- Kefa and Watch2500Codeforcesdata structureshashingstrings
- Kevin and Math Class2500Codeforcesbrute forcedata structuresdivide and conquerdp
- Keyboard Design2600Codeforcesbitmasksdata structuresdpstring suffix structures
- Khayyam's Royal Decree (Easy Version)2500Codeforcescombinatoricsdpmathsortings
- Killing Monsters2687CodeChef
- Killjee and k-th letter 2763CodeChef
- Kindergarten2400Codeforcesdata structuresdpgreedy
- King Kog's Reception2400Codeforcesdata structures
- King's Path2500Codeforces*specialmathtrees
- King's Problem?2600Codeforcesgeometrygreedy
- Kingdom of Criticism2500Codeforcesdata structuresdsu
- Kirito in Memeland2631CodeChef
- Knight Moving2647CodeChef
- Knights2600Codeforcesconstructive algorithms
- Koala and Notebook2600Codeforcesdata structuresdfs and similargraphsshortest paths
- Konrad and Company Evaluation2400Codeforcesgraphs
- Korney Korneevich and XOR (hard version)2400Codeforcesbinary searchbrute forcedpgreedy
- Koxia and Tree2400Codeforcescombinatoricsdfs and similardpdsu
- Ksenia and Combinatorics2600Codeforcescombinatoricsdp
- Ksusha and Square2700Codeforcesgeometrymathprobabilitiestwo pointers
- Kuro and Topological Parity2400Codeforcesdp
- Kuroni and the Punishment2500Codeforcesmathnumber theoryprobabilities
- Kuzya and Homework2600Codeforcesdata structuresnumber theory
- L BREAK into program2500Codeforces*special
- LCD2832CodeChef
- LCM Constraints2800CodeChef
- LCM Sum (hard version)2500Codeforcesbrute forcedata structuresmathnumber theory
- LCM equation2791CodeChef
- LCP Maximization2846CodeChef
- LCS Again2700Codeforcesdpgreedy
- LRU2400Codeforcesbitmasksdpmathprobabilities
- Labeling the Tree with Distances2400Codeforcesdata structuresdpgreedyhashing
- Labelling Cities2400Codeforcesdfs and similargraphshashing
- Laboratory on Pluto2500Codeforcesconstructive algorithmsdpgreedymath
- Labyrinth2400Codeforcesbinary searchdsugreedy
- Labyrinth Adventures2600Codeforcesdata structuresdpmatricesshortest paths
- Lame Queen Game2741CodeChef
- Lamps on a Circle2600Codeforcesgamesimplementationinteractivemath
- Large Graph2400Codeforcesdata structuresdfs and similardsugraphs
- Large Triangle2700Codeforcesbinary searchgeometrysortings
- Largest Submatrix 32700Codeforcesdphashing
- Last chance2500Codeforcesdata structuresflowsgraph matchingsgraphs
- Latin Square2700Codeforcesmathmatrices
- Lazy Ancestors2723CodeChef
- LeaFall2600Codeforcescombinatoricsdpprobabilitiestrees
- Leaf Partition2500Codeforcesdptrees
- Leaf Sets2400Codeforcesdata structuresdfs and similardsugraphs
- Learning Binary Search2400Codeforcescombinatoricsdivide and conquerdpmath
- Learning Dishes2715CodeChef
- Least Cost Bracket Sequence2600Codeforcesgreedy
- Left is Always Right2400Codeforcescombinatoricsimplementationmath
- Legen...2500Codeforcesdata structuresdpmatricesstrings
- Lemper Cooking Competition2400Codeforcesdata structures
- Lena and Queries2500Codeforcesdata structuresdivide and conquergeometry
- Lenient Vertex Cover2600Codeforcesdfs and similardivide and conquerdsugraphs
- Let Me Teach You a Lesson (Easy Version)2700Codeforces2-satdata structuresdpmatrices
- Levels and Regions2400Codeforcesdp
- Levko and Sets2600Codeforcesnumber theory