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- MEX OR Mania2700Codeforcesbitmasksbrute forcedata structuresdsu
- MEX Replacement on Tree2700Codeforcesdata structuresimplementationmathtrees
- MEX Sequences2838CodeChef
- MEX Tree2400Codeforcescombinatoricsdfs and similarimplementationmath
- MEXimal Moving2668CodeChef
- MEXtreme Divisibility2884CodeChef
- MST Company2400Codeforcesbinary searchgraphs
- MST Queries2871CodeChef
- MST in Modulo Graph2600Codeforcesconstructive algorithmsdsugraphsgreedy
- MUH and Lots and Lots of Segments2700Codeforcesdata structuresdsu
- Machine Learning2600Codeforcesbrute forcedata structures
- Machine Programming2400Codeforcesflowsgraphs
- Madhouse (Easy version)2400Codeforcesbrute forceconstructive algorithmsinteractivemath
- Madness2500Codeforcesconstructive algorithmsdfs and similartrees
- Madoka and The First Session2500Codeforcesconstructive algorithmsflowsgraph matchingsgraphs
- Madoka and the Sixth-graders2500Codeforcesdata structuresdfs and similargreedy
- Magic Matrix2400Codeforcesbrute forcedivide and conquergraphsmatrices
- Magic Weed2848CodeChef
- Magic multisets2500Codeforcesdata structures
- Magical Permutation2400Codeforcesbitmasksbrute forceconstructive algorithmsdata structures
- Magician and Pigs (Easy Version)2400Codeforcesbrute forcedata structuresimplementation
- Magician and Pigs (Hard Version)2700Codeforcesbinary searchbrute forcedata structuresimplementation
- Magnets2700Codeforcesbinary searchconstructive algorithmsinteractive
- Mahmoud and Ehab and yet another xor task2400Codeforcesbitmasksdpmathmatrices
- Majority2700Codeforcescombinatoricsdpmathstrings
- Majority Wins?2600Codeforcesconstructive algorithmsgreedymathstrings
- Make Good2400Codeforcesconstructive algorithmsgreedymathstrings
- Make It Connected2400Codeforcesbinary searchbrute forceconstructive algorithmsdsu
- Make It One2500Codeforcesbitmaskscombinatoricsdpmath
- Make It One2875CodeChef
- Make Them Similar2400Codeforcesbitmasksbrute forcehashingmeet-in-the-middle
- Make a Palindrome2600Codeforcesbinary searchbrute forcedata structuresgreedy
- Make everything divisible by 32650CodeChef
- Managing Cluster2700Codeforcesdpgraphsmathtrees
- Managing Telephone Poles2400Codeforcesdata structuresgeometry
- Manhattan Triangle2400Codeforcesbinary searchconstructive algorithmsdata structuresgeometry
- Mani and Segments2500Codeforcesdata structuresimplementationsortingstwo pointers
- Many Lists2897CodeChef
- Many bananas2760CodeChef
- Map2500Codeforcesdata structuresimplementationsortings
- Marbles2500Codeforceshashingstrings
- Mario and Luigi2791CodeChef
- Mars2700Codeforceshashing
- Martial Arts2873CodeChef
- Masha and Cactus2400Codeforcesdptrees
- Mass Change Queries2500Codeforcesdata structures
- Mastermind2500Codeforcesconstructive algorithmsgraph matchingsgreedyimplementation
- Match the Streams2732CodeChef
- Math Hatter2655CodeChef
- Mathematical Expression2700Codeforcesconstructive algorithmsdpgreedy
- Mathematics Curriculum2600Codeforcesbrute forcecombinatoricsdptrees
- Mathison and the teleportation game2820CodeChef
- Mathology2682CodeChef
- Matrix Problem2400Codeforcesflowsgraphs
- Matrix Rank (Easy Version)2700Codeforcesbrute forcecombinatoricsdpmath
- Matrix Rank (Hard Version)2700Codeforcescombinatoricsdpmathmatrices
- Matrix Sorting2600Codeforcesbitmasksbrute forceconstructive algorithmsgreedy
- Matrix Transformation2706CodeChef
- Mausoleum2400Codeforcesdp
- Max BIT Sum2654CodeChef