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- New Colony1100Codeforcesbrute forcegreedyimplementation
- New Year Present1200Codeforcesconstructive algorithmsimplementation
- New Year and Buggy Bot1200Codeforcesbrute forceimplementation
- New Year and the Treasure Geolocation1200Codeforcesbrute forceconstructive algorithmsgreedyimplementation
- News About Credit1200Codeforces*specialgreedytwo pointers
- Next Test1200Codeforcesimplementationsortings
- Nezzar and Lucky Number1100Codeforcesbrute forcedpgreedymath
- Nice Array1546CodeChef
- Niko's Tactical Cards1100Codeforcesdpgreedymath
- Nirvana1200Codeforcesbrute forcemathnumber theory
- No Doubling1540CodeChef
- Non-Coprime Partition1100Codeforcesconstructive algorithmsmath
- Non-Primes 1011516CodeChef
- Non-coprime Split1100Codeforcesmathnumber theory
- Not Prime Permutation1447CodeChef
- Number Circle1100Codeforcesgreedymathsortings
- Number Factorization1100Codeforcesgreedymathnumber theory
- Number Maze1200Codeforcesimplementation
- Numbers on the Chessboard1200Codeforcesimplementationmath
- Nuts1100Codeforcesgreedymath
- OIE Excursion1200Codeforcesgreedy
- OR What1546CodeChef
- Obtaining the String1200Codeforcesimplementation
- Odd GCD1583CodeChef
- Odd Operations1409CodeChef
- Odd Selection1200Codeforcesbrute forceimplementationmath
- Odd Sum Segments1200Codeforcesconstructive algorithmsmath
- Odd Swap Sort1100Codeforcesdata structuresmathsortings
- Ohana Cleans Up1200Codeforcesbrute forcegreedystrings
- Omkar and Heavenly Tree1200Codeforcesconstructive algorithmstrees
- Omkar and Waterslide1200Codeforcesgreedyimplementation
- One Stone or Two Stones1504CodeChef
- One-XOR Deletions1516CodeChef
- Opposites Attract1200Codeforcesimplementationmath
- Oracle for f(x) = b * x mod 21200Codeforces*special
- Oracle for f(x) = parity of the number of 1s in x1200Codeforces*special
- Orchestra1100Codeforcesbrute forceimplementation
- Order by XOR1476CodeChef
- OutOfMemoryError1100Codeforcesdata structuresimplementationmathtwo pointers
- Outstanding Impressionist1200Codeforcesbinary searchbrute forcedata structuresgreedy
- Paint the Array1100Codeforcesmath
- Pair Programming1100Codeforcesgreedytwo pointers
- Palindrome Game (easy version)1200Codeforcesconstructive algorithmsgames
- Palindrome Pain1506CodeChef
- Palindrome by Splitting1540CodeChef
- Palindromex1200Codeforcesbinary searchbrute forceconstructive algorithmsdata structures
- Palindromic Numbers 1100Codeforcesconstructive algorithmsimplementationmath
- Palindromic Score1401CodeChef
- Palindromic Subsequences1200Codeforcesbrute forceconstructive algorithmsmath
- Parade1100Codeforcesmath
- Parallel Processing1425CodeChef
- Parallelepiped1100Codeforcesbrute forcegeometrymath
- Parallelogram is Back1200Codeforcesbrute forceconstructive algorithmsgeometry
- Paranoid String1200Codeforcesconstructive algorithmsgreedy
- Parity and Sum1100Codeforcesconstructive algorithmsgreedy
- Parry It! (Easy)1568CodeChef
- Partial Replacement1100Codeforcesgreedyimplementation
- Pasha and Pixels1100Codeforcesbrute force
- Pashmak and Garden1200Codeforcesimplementation
- Passwords1100Codeforcesimplementationmathsortingsstrings