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- Wish Upon a Satellite (Hard Version)3500Codeforcesdata structuresdp
- Wizards and Bets2900Codeforcesdfs and similargraphsmathmatrices
- Wizards and Roads3000Codeforcesdata structuresdivide and conquergraph matchingsgraphs
- Wonderful Guessing Game3200Codeforcesbitmasksconstructive algorithmsinteractive
- Wonderful Impostors3100Codeforcesdata structuresimplementationtwo pointers
- Wonderful Jump2900Codeforcesdpgreedy
- Wonderful XOR Problem3200Codeforcesbitmaskscombinatoricsdpfft
- Wooden Raft3200Codeforcesbinary searchmathnumber theory
- WordNinjas3434CodeChef
- World Cup3092CodeChef
- World of Tank3000Codeforcesdpgreedy
- Wowee Binary String3200Codeforcescombinatoricsdpstrings
- Wrap Around2900Codeforcesdpstrings
- X-Ray Grid2939CodeChef
- XOR Minimization2941CodeChef
- XOR Operations2800Codeforces
- XOR Partition Sort3276CodeChef
- XOR Shortest Path2928CodeChef
- XOR and Distance2900Codeforcesbitmasksdivide and conquertrees
- XOR-ranges3500Codeforcesdpgreedy
- Xenia and String Problem3000Codeforcesdphashingimplementationstring suffix structures
- Xor Counting3466CodeChef
- Xor Grid3194CodeChef
- Xor Minimization (Easy)3027CodeChef
- Xor Minimization (Hard)3229CodeChef
- Xor Permutations3100Codeforcesconstructive algorithmsmath
- Xor Product3300Codeforcesbitmasksdp
- Xor Travellers3096CodeChef
- Xor X,Get MAX3086CodeChef
- Xor of Median (Hard Version)3000Codeforcesbitmasksbrute forcecombinatoricsdp
- Xor on Figures3500Codeforcesconstructive algorithmsfftmath
- Xor-Set3100Codeforcesbitmasksdivide and conquermath
- Xor-quiz3200Codeforcesconstructive algorithmsdpinteractivemath
- Xors on Segments2800Codeforcesdata structuresstringstrees
- Yandex Cuneiform (Easy Version)3300Codeforcesconstructive algorithmsdata structuresgreedy
- Yandex Cuneiform (Hard Version)3500Codeforcesconstructive algorithmsdata structuresgreedyimplementation
- Yaroslav and Arrangements2800Codeforcesdp
- Yash And Trees2800Codeforcesbitmasksdata structuresdfs and similarmath
- Yet Another Counting Problem3152CodeChef
- Yet Another LIS Problem3127CodeChef
- Yet Another Partiton Problem3000Codeforcesdata structuresdivide and conquerdpgeometry
- Yet Another Shortest Path Problem3387CodeChef
- Yet Another XOR Sort 23152CodeChef
- Yet Another XOR Task3466CodeChef
- Yet Yet Another Permutation Problem3400Codeforcesdivide and conquerfftmath
- Yin Yang3500Codeforcesimplementation
- You Are Given a Tree2800Codeforcesdata structuresdptrees
- Your Loss3000Codeforcesbitmasksbrute forcedptrees
- Yuezheng Ling and Dynamic Tree3400Codeforcesdata structurestrees
- Yui and Mahjong Set3200Codeforcesconstructive algorithmsinteractive
- Yura and Developers2800Codeforcesdata structuresdivide and conquer
- ZS Shuffles Cards3000Codeforcescombinatoricsdpmathprobabilities
- Zero-XOR Array3400Codeforces*specialdp
- Zhily and Colorful Strings3400Codeforcesdivide and conquerfftmath
- Zhily and Cycle2800Codeforcesgraphsgreedy
- Zhily and Permutation3500Codeforcesdata structuresdivide and conquertrees
- Zhora the Vacuum Cleaner2800Codeforcesdata structuresdfs and similardpgreedy
- Zig-zag3500Codeforces
- ZigZag Tree Sequences (Easy)3223CodeChef
- ZigZag Tree Sequences (Hard)3034CodeChef