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- New Passenger Trams2300Codeforcesbinary searchbrute forcedata structuressortings
- New Roads2100Codeforcesconstructive algorithmsgraphstrees
- New School2300Codeforcesbinary searchdata structuresdpgreedy
- New Year Domino2300Codeforcesdata structuresdpdsu
- New Year Tree2100Codeforcesbitmasksdata structurestrees
- New Year and Arbitrary Arrangement2200Codeforcesdpmathprobabilities
- New Year and Conference2100Codeforcesbinary searchdata structureshashingsortings
- New Year's Puzzle2100Codeforcesbrute forcedpgraph matchingsgreedy
- New York Hotel2100Codeforcesgreedymath
- Nezzar and Nice Beatmap2200Codeforcesconstructive algorithmsgeometrygreedymath
- Nice table2100Codeforcesbrute forceconstructive algorithmsgreedymath
- Nikita and Order Statistics2300Codeforceschinese remainder theoremfftmath
- Nikita and stack2200Codeforcesdata structures
- No Effect XOR2300Codeforcesbitmasksdivide and conquerdpgreedy
- Node Pairs2200Codeforcesdpgraphsmathnumber theory
- Non-Decreasing Dilemma2200Codeforcesdata structuresdivide and conquermath
- Non-Intersecting Subpermutations2300Codeforcescombinatoricsdpimplementationmath
- Normal is Good2406CodeChef
- Not Escaping2200Codeforcesdata structuresdpimplementationshortest paths
- Not Tree Again!2586CodeChef
- Not a Nim Problem2100Codeforcesbrute forcegamesmathnumber theory
- Nuclear Fusion2200Codeforcesbitmasksdp
- Nudist Beach2300Codeforcesbinary searchgraphsgreedy
- Number Deletion Game2100Codeforces*specialdpgamesgreedy
- Number Transformation II2200Codeforcesgreedymath
- Number of Components2100Codeforcescombinatoricsdata structuresdpmath
- Number of Groups2300Codeforcesdata structuresdfs and similardsugraphs
- Number of k-good subarrays2300Codeforcesbitmasksbrute forcecombinatoricsdivide and conquer
- Numerical Sequence (hard version)2200Codeforcesbinary searchmath
- Odd Strings2592CodeChef
- Okabe and City2200Codeforcesdfs and similargraphsshortest paths
- Okabe and El Psy Kongroo2100Codeforcesdpmatrices
- Olya and Energy Drinks2100Codeforcesdata structuresdfs and similargraphsshortest paths
- Olya and Graph2200Codeforcescombinatoricsmath
- Om Nom and Necklace2200Codeforceshashingstring suffix structuresstrings
- Omkar and Circle2100Codeforcesbrute forcedpgamesgreedy
- Omkar and Duck2100Codeforcesbitmasksconstructive algorithmsinteractivemath
- Omkar and Forest2300Codeforcescombinatoricsgraphsmathshortest paths
- Omsk Metro (hard version)2300Codeforcesdata structuresdfs and similardivide and conquerdp
- On a plane2200Codeforces*specialgeometry
- One or All2420CodeChef
- One-Way Reform2200Codeforcesconstructive algorithmsdfs and similarflowsgraphs
- OpenStreetMap2100Codeforcesdata structurestwo pointers
- Operation Permutation2200Codeforcescombinatoricsdpmathprobabilities
- Optimal Insertion2300Codeforcesdata structuresdivide and conquerdpgreedy
- Optimal Partition2100Codeforcesdata structuresdp
- Optimal Polygon Perimeter2100Codeforcesdpgeometry
- Optimizer2100Codeforcesdata structuresgreedysortings
- Order book2100Codeforcescombinatoricsdata structuresgreedy
- Oriented Journey2200Codeforcesbitmasksbrute forcecommunicationconstructive algorithms
- Overlapping discs2521CodeChef
- P Equal To NP2448CodeChef
- PE Lesson2300Codeforcesbrute forcedp
- PE Lesson2300Codeforcesdp
- Package Delivery2200Codeforcesdata structuresdivide and conquergreedy
- Paint Charges2300Codeforcesdata structuresdpgreedymath
- Paint Tree2200Codeforcesconstructive algorithmsdivide and conquergeometrysortings
- Paint the Middle2200Codeforcesdpgreedysortingstwo pointers
- Paint the Tree2100Codeforcesdpsortingstrees
- Painting Square2300Codeforcesdpfft