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- Wizards and Numbers2300Codeforcesgamesmath
- World Eater Brothers2100Codeforcesdfs and similardpgreedytrees
- World War 22499CodeChef
- Wormhouse2300Codeforcesdfs and similargraphs
- Writing a Song2100Codeforcesbrute forcedpstrings
- Wrong Answer on test 233 (Easy Version)2200Codeforcesdp
- Wrong Floyd2200Codeforcesbrute forceconstructive algorithmsdfs and similargraphs
- X Aura2200Codeforcesgraphsmathshortest paths
- X(or)-mas Tree2200Codeforcesbitmasksdfs and similardsugraphs
- X-24 and his SUBSET code2530CodeChef
- XOR & Sum2577CodeChef
- XOR Break --- Solo Version2100Codeforcesbitmasksconstructive algorithmsgreedy
- XOR Times 2 Is Sum2502CodeChef
- XOR and Favorite Number2200Codeforcesdata structures
- XORificator2300Codeforcesbitmasksbrute forcegreedyhashing
- Xenia and Dominoes2100Codeforcesbitmasksdfs and similardp
- Xenon's Attack on the Gangs2300Codeforcescombinatoricsdfs and similardpgreedy
- Xor Becoming Uncanny2576CodeChef
- Xor Compare2447CodeChef
- Xor Jar Muluk Tar2505CodeChef
- Xor Matrix2592CodeChef
- Xor Queries2513CodeChef
- Xor Tree2100Codeforcesbinary searchbitmasksdata structuresdivide and conquer
- Xor-MST2300Codeforcesbitmasksconstructive algorithmsdata structures
- Xor-Paths2100Codeforcesbitmasksbrute forcedpmeet-in-the-middle
- Yalalovichik Strings2499CodeChef
- Yaroslav and Divisors2200Codeforcesdata structures
- Yaroslav and Time2100Codeforcesbinary searchgraphsshortest paths
- Yasya and the Mysterious Tree2300Codeforcesbitmasksdata structuresdfs and similargraphs
- Yet Another Array Counting Problem2300Codeforcesbinary searchdata structuresdivide and conquerdp
- Yet Another Inversions Problem2300Codeforcescombinatoricsdata structuresdpimplementation
- Yet Another MEX Problem2300Codeforcesbrute forceconstructive algorithmsdata structuresdivide and conquer
- Yet Another Number Game2100Codeforcesdpgames
- Yet Another Palindromic Problem2555CodeChef
- Yet Another Segments Subset2300Codeforcesdata structuresdpgraphssortings
- Yet Another String Matching Problem2200Codeforcesfftmath
- Yet Another Substring Reverse2200Codeforcesbitmasksdp
- Yet another 2D Walking2100Codeforcesdp
- You Are Given a WASD-string...2100Codeforcesbrute forcedata structuresdpgreedy
- Yunli's Subarray Queries (hard version)2200Codeforcesbinary searchdata structuresdp
- ZS and The Birthday Paradox2300Codeforcesmathnumber theoryprobabilities
- Zbazi in Zeydabad2300Codeforcesdata structuresimplementation
- Zero Remainder Sum 2100Codeforcesdp
- Zhily and Signpost2300Codeforceschinese remainder theoremdfs and similarmathnumber theory
- Zigzag2100Codeforcesdata structures
- Zombinatorial2577CodeChef
- ace5 and Task Order2200Codeforcesconstructive algorithmsdivide and conquerimplementationinteractive
- kotlinkotlinkotlinkotlin...2300Codeforces*specialgraphsimplementationstrings
- notepad.exe2200Codeforcesbinary searchconstructive algorithmsgreedyinteractive
- st-Spanning Tree2300Codeforcesdsugraphsgreedyimplementation
- wxhtzdy ORO Tree2300Codeforcesbinary searchbitmasksbrute forcedata structures
- ±12100Codeforces2-satdfs and similargraphs
- Автобус2100Codeforcesbinary searchdata structuresgreedysortings
- Игра в Девятку II2200Codeforces*specialbrute force
- Игра в Девятку III2300Codeforces*specialbrute force
- Собери число2300Codeforcesgraphsshortest paths
- 2 + 2 != 42400Codeforces*special
- 2..3...4.... Wonderful! Wonderful!2400Codeforcescombinatoricsdpmath
- 3-Palindromes2781CodeChef
- 3D Queries2878CodeChef