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- Jeopardy of Dropped Balls1500Codeforcesbinary searchbrute forcedsuimplementation
- Job Interview1600Codeforcesbinary searchdpgreedyimplementation
- Joker and Batman1816CodeChef
- Joty and Chocolate1600Codeforcesimplementationmathnumber theory
- Journey1500Codeforcesdfs and similardpgraphsprobabilities
- Jump to Sibling1888CodeChef
- Jumping Jack1600Codeforcesmath
- Jury Meeting1500Codeforcescombinatoricsmath
- Jury Size1500Codeforcesbrute forceimplementation
- K for the Price of One (Hard Version)1600Codeforcesdpgreedysortings
- K-Complete Word1500Codeforcesdfs and similardsugreedyimplementation
- K-Unique Sequence1901CodeChef
- Kachina's Favorite Binary String1600Codeforcesdpgreedyinteractivetwo pointers
- Kayaking1500Codeforcesbrute forcegreedysortings
- Kefa and Company1500Codeforcesbinary searchsortingstwo pointers
- Kefa and Park1500Codeforcesdfs and similargraphstrees
- Keshi Is Throwing a Party1600Codeforcesbinary searchgreedy
- Kevin and Competition Memories1600Codeforcesbinary searchbrute forcedata structuresgreedy
- Kevin and Numbers1600Codeforcesbitmasksdata structures
- Kevin and Puzzle1600Codeforces2-satcombinatoricsdp
- Keyboard1500Codeforcesimplementation
- Killjoy1500Codeforcesgreedyimplementationmath
- Knight Fork1914CodeChef
- Knight Tournament1500Codeforcesdata structuresdsu
- Knowledge Cards1500Codeforcesconstructive algorithmsdata structures
- Kolya and Movie Theatre1600Codeforcesconstructive algorithmsdata structuresgreedy
- Kolya and Tandem Repeat1500Codeforcesbrute forceimplementationstrings
- Kolya and Tanya 1500Codeforcescombinatorics
- Kostya the Sculptor1600Codeforcesdata structureshashing
- Kuro and Walking Route1600Codeforcesdfs and similartrees
- Kuroni and Impossible Calculation1600Codeforcesbrute forcecombinatoricsmathnumber theory
- Kyoya and Colored Balls1500Codeforcescombinatoricsdpmath
- LCM Challenge1600Codeforcesnumber theory
- LIS and LDS1822CodeChef
- Lakes in Berland1600Codeforcesdfs and similardsugraphsgreedy
- Lamps in a Line1600Codeforces*specialmath
- Large Bouquets1500Codeforces
- Largest Y1823CodeChef
- Last Digit Sum1910CodeChef
- Lawnmower1500Codeforcesgreedysortings
- League of Leesins1600Codeforcesconstructive algorithmsimplementation
- Least Prefix Sum1600Codeforcesdata structuresgreedy
- Li Hua and Chess1600Codeforcesconstructive algorithmsgreedyinteractive
- Lie or Truth1500Codeforces*specialconstructive algorithmsimplementationsortings
- Liebig's Barrels1500Codeforcesgreedy
- Light It Up1500Codeforcesgreedy
- Lighthouses1986CodeChef
- Lights Off1872CodeChef
- Lightsabers (easy)1500Codeforcesimplementation
- Limited Repainting1500Codeforcesbinary searchgreedy
- Line Empire1500Codeforcesbinary searchbrute forcedpgreedy
- Link/Cut Tree1500Codeforcesbrute forceimplementation
- Linova and Kingdom1600Codeforcesdfs and similardpgreedysortings
- Literature Lesson1600Codeforcesimplementation
- Little Dima and Equation1500Codeforcesbrute forceimplementationmathnumber theory
- Little Elephant and Alcohol1811CodeChef
- Little Elephant and Balance1940CodeChef
- Little Elephant and Cards1500Codeforcesbinary searchdata structures
- Little Elephant and Exams1810CodeChef
- Little Elephant and Interval1500Codeforcesbinary searchcombinatoricsdp