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- Make and Break on Tree3349CodeChef
- Make the Matrix Beautiful2912CodeChef
- Making Change3212CodeChef
- Making It Bipartite3400Codeforcesflowsgraph matchingsgraphsnumber theory
- Making Shapes3500Codeforcesdp
- Making Stars3086CodeChef
- Manhattan Xor2907CodeChef
- Many Cartesian Trees3500Codeforcesgreedysortingstrees
- Many Games2900Codeforcesbrute forcedpgreedymath
- Many Left3424CodeChef
- Marching Orders2948CodeChef
- Marek and Matching (easy version)3100Codeforcesbrute forceprobabilities
- Marek and Matching (hard version)3200Codeforcesbrute forceprobabilities
- Mark and Spaceship3500Codeforcesbrute forcedp
- Mark and the Online Exam2900Codeforcesbitmasksconstructive algorithmsinteractiveprobabilities
- Marmots (hard)2800Codeforcesmathprobabilities
- Martian Colony3000Codeforcesgeometry
- Martian Food2800Codeforcesgeometry
- Mashmokh's Designed Problem3200Codeforcesdata structures
- Mashtali and Hagh Trees2900Codeforcescombinatoricsdptrees
- Mashtali vs AtCoder3100Codeforcesgamestrees
- Mashtali: a Space Oddysey3000Codeforcesconstructive algorithmsdfs and similargraphs
- Matches Are Not a Child's Play 3400Codeforcesdata structurestrees
- Matching Arrays3176CodeChef
- Matching Reduction2800Codeforcesbrute forceconstructive algorithmsdfs and similarflows
- Mateusz and Escape Room3500Codeforcesdp
- Mateusz and an Infinite Sequence3400Codeforcesbitmasksbrute forcedpstrings
- Math, math everywhere3200Codeforcesbrute forcedpmathmeet-in-the-middle
- MathBuzz3045CodeChef
- Mathison and the Data Warehouse (Challenge)3762CodeChef
- Mathison and the cubic tree3276CodeChef
- Matrix3000Codeforcesdata structures
- Matrix Permutations3933CodeChef
- Matvey's Birthday3300Codeforcesbitmasksgraphs
- Max Circumference3000CodeChef
- Max Correct Set3100Codeforcesbitmasksdpmath
- Max Graph3306CodeChef
- Max Mex2900Codeforcesdata structurestrees
- Max Min Circle Difference3304CodeChef
- Max Minus Min3139CodeChef
- Max Swap And2925CodeChef
- Maxflow GCD Coloring3500Codeforcesconstructive algorithmsflowsgraphs
- Maxim and Calculator2800Codeforcesbrute forcedptwo pointers
- Maximal GCD3951CodeChef
- Maximal Prefix After Flip3013CodeChef
- Maximal Trigonal Area3992CodeChef
- Maximise Score3074CodeChef
- Maximise Sum3026CodeChef
- Maximise Sum3200Codeforcesbinary searchdata structures
- Maximize Determinant3300Codeforcesgraphs
- Maximizing Minimum Segment Sum2953CodeChef
- Maximum Adjacent Pairs3300Codeforcesconstructive algorithmsgraph matchings
- Maximum Difference Walk3675CodeChef
- Maximum Flow3000Codeforcesflowsgraphs
- Maximum Frequent Subarray Sum3129CodeChef
- Maximum GCD2936CodeChef
- Maximum GCD Subset3332CodeChef
- Maximum GCD Sum Queries3100Codeforcesbitmasksbrute forcedpimplementation
- Maximum Matching3034CodeChef
- Maximum OR Sum3022CodeChef