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- Weight the Tree2000Codeforcesconstructive algorithmsdfs and similardpimplementation
- Weights Division (easy version)2000Codeforcesdata structuresdfs and similargreedytrees
- Weird Values2393CodeChef
- Wet Shark and Blocks2000Codeforcesdpmatrices
- What Has Dirichlet Got to Do with That?2000Codeforcesdpgames
- White Lines1900Codeforcesbrute forcedata structuresdpimplementation
- White Magic1900Codeforcesconstructive algorithmsdata structuresdpgreedy
- Wildcard Replacement2317CodeChef
- Wires2000Codeforcesdfs and similargraphsgreedy
- Wish I Knew How to Sort2000Codeforcesdpmathprobabilities
- Wishing Cards1900Codeforcesdp
- Without Text2000Codeforces*special
- Wonder Room2000Codeforcesbrute forcemath
- Wonderful Lightbulbs2000Codeforcescombinatoricsconstructive algorithmsmath
- Wonderful Tree!2000Codeforcesbrute forcedata structuresdfs and similardsu
- Wooden Game2000Codeforcesbitmasksgreedymathtrees
- Word Play2397CodeChef
- Work Group2000Codeforcesdfs and similardpgraphsstrings
- World Tour2000Codeforcesgraphsshortest paths
- World of Darkraft: Battle for Azathoth2000Codeforcesbrute forcedata structuressortings
- Wrong Answer2000Codeforcesconstructive algorithms
- X AND Y Tree2291CodeChef
- XOR Construction1900Codeforcesbitmasksconstructive algorithmsdata structuresmath
- XOR Guessing1900Codeforcesbitmasksinteractivemath
- XOR Inverse2000Codeforcesbitmasksdata structuresdivide and conquerdp
- XOR Sums2306CodeChef
- XOR on Segment2000Codeforcesbitmasksdata structures
- XOR-factorization1900Codeforcesbitmasksconstructive algorithmsdpgreedy
- XOR-gun2000Codeforcesbitmasksbrute forceconstructive algorithms
- XORificator 30001900Codeforcesbitmasksdpnumber theorytwo pointers
- Xenia and Hamming1900Codeforcesimplementationmath
- Xor2000Codeforcesbrute force
- Xor Decomposition2279CodeChef
- Xor it2236CodeChef
- Xor-sequences1900Codeforcesmatrices
- Yaroslav and Two Strings2000Codeforcescombinatoricsdp
- Yet Another Crossover Episode2221CodeChef
- Yet Another Division Into Teams2000Codeforcesdpgreedysortings
- Yet Another Partition Problem2350CodeChef
- Yet Another Permutation Constructive1900Codeforces*specialconstructive algorithms
- Yet Another Problem1900Codeforcesbinary searchbitmasksconstructive algorithmsdata structures
- Yet Another Problem On a Subsequence1900Codeforcescombinatoricsdp
- Yet Another Sorting Problem1900Codeforcesdata structuresmath
- Yet Another Subarray Problem1900Codeforcesdpgreedymath
- Yet Another Tree Problem2382CodeChef
- Yet Another Yet Another Task2000Codeforcesdata structuresdpimplementationtwo pointers
- Yet another Matrix problem2307CodeChef
- You're a Professional1900Codeforces*special
- Yunli's Subarray Queries (easy version)1900Codeforcesbinary searchdata structurestwo pointers
- Zero-One1900Codeforcesconstructive algorithmsgamesgreedy
- Zero-One (Hard Version)2000Codeforcesdpgreedy
- Zeta-Nim Game2235CodeChef
- Zigzags1900Codeforcesbrute forcecombinatoricsdata structuresmath
- Zuma1900Codeforcesdp
- Собачки и миски1900Codeforcesdata structuresgreedysortings
- (Zero XOR Subset)-less2300Codeforcesmathmatrices
- 0-1-Tree2200Codeforcesdfs and similardivide and conquerdpdsu
- 01 Tree2100Codeforcesconstructive algorithmsdata structuresdsugreedy
- 1-2 Reorder2416CodeChef
- 10. Regular Expression MatchingHardLeetCodeStringDynamic ProgrammingRecursion