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- Olympiad Training3500Codeforcesbinary searchdata structuresdpflows
- Olympic Team Building3500Codeforcesbrute forcemeet-in-the-middle
- Omkar and Last Floor2900Codeforcesdpgreedytwo pointers
- Omkar and Mosaic3500Codeforcescombinatoricsconstructive algorithmsmath
- Omkar and Pies2900Codeforcesbitmasksdfs and similardpmath
- Omkar and Time Travel3000Codeforcesdata structuresmath
- Omkar and Tours3300Codeforcesdata structuresdivide and conquersortingstrees
- On Graphs, Probability Theory and Cakes3300CodeChef
- One Billion Shades of Grey3300Codeforcesflowsgraphs
- One Pile 3549CodeChef
- Ones2900Codeforcesdpgreedyshortest paths
- Onion3500Codeforces
- Online Palindrome3000Codeforcesbrute forceconstructive algorithmsinteractive
- Oppa Funcan Style Remastered3300Codeforcesgraphsmathnumber theoryshortest paths
- Optimal Encoding3500Codeforcesbrute forcedata structures
- Optimal Memory Address3150CodeChef
- Optimal Point2900Codeforcesbinary searchmath
- Optimal Shopping II3613CodeChef
- Optimal Splitting3081CodeChef
- Optimal Subset3226CodeChef
- Optimal Xor Set3036CodeChef
- Optimizations From Chelsu3500Codeforcesdivide and conquerdpnumber theorytrees
- Or Sum3074CodeChef
- Orchestra3000Codeforcestwo pointers
- Order Statistics3400Codeforces*specialbinary search
- Ordering T-Shirts2800Codeforcesgreedy
- Organizing a Music Festival3400Codeforcesdfs and similarmath
- Organizing a Race3300Codeforcesdata structuresgreedy
- Origami3300Codeforcesgeometrymathsortings
- Our Enemy does not Tire3170CodeChef
- Outermost Maximums3400Codeforcesdata structuresgreedy
- Outside of Brackets3572CodeChef
- Pac-Man 2.02900Codeforces*specialdp
- Paint the Tree3519CodeChef
- Painting Edges3300Codeforcesbinary searchdata structures
- Painting Rectangles3641CodeChef
- Painting Tree2970CodeChef
- Pair Making Problem3239CodeChef
- Paired Tree3463CodeChef
- Pairs Flipping (Easy Version)3500Codeforcesconstructive algorithms
- Pairs Flipping (Hard Version)3500Codeforcesconstructive algorithms
- Pairs of Pairs2926CodeChef
- PalindORme2900Codeforcescombinatoricsdp
- Palindrome Addicts3300Codeforcesdata structuresstrings
- Palindrome Love3077CodeChef
- Palindrome Partition2900Codeforcesdpstring suffix structuresstrings
- PalindromePalindrome3400Codeforcesdata structuresstrings
- Palindromeness3062CodeChef
- Palindromes and Queries3355CodeChef
- Palindromic Equivalence2958CodeChef
- Palindromic Hamiltonian Path3000Codeforcesbrute forcedfs and similardpgraphs
- Palindromic Magic3500Codeforcesdata structureshashingstrings
- Palindromic Problem2800Codeforcesbinary searchdata structureshashingstring suffix structures
- Palisection2900Codeforcesstrings
- Panda Meetups3500Codeforcesdata structuresdpflows
- Paper Cutting Again3100Codeforcescombinatoricsprobabilities
- Parallel Swaps Sort3500Codeforcesconstructive algorithmsdata structures
- Parallel Universes (Hard)3100Codeforcesmathmatrices
- Parametric Circulation3100Codeforcesbinary searchflows
- Parity Fun3281CodeChef