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37,000 problems · all sources
- Two Set Game3414CodeChef
- Two Sorts3400Codeforcesbinary searchdfs and similarmathmeet-in-the-middle
- Two Subsequences2800Codeforcesbitmasksdp
- Two Subtrees3100Codeforcesdata structurestrees
- Ultimate Weirdness of an Array2800Codeforcesdata structuresnumber theory
- Uncommon Cycles3064CodeChef
- Unequal Adjacent Elements3100Codeforcesconstructive algorithmssortings
- Uniform Chemistry3200Codeforcesdpmath
- Union on Tree3256CodeChef
- Unique Strings3100Codeforcescombinatoricsdpmath
- Unique Substring3082CodeChef
- Unique Sum 23202CodeChef
- University Schedule2900Codeforces*special
- Unreasonable Updates3048CodeChef
- Unsorted Sorting3091CodeChef
- Unstable Elections3060CodeChef
- Unusual Graph3000Codeforces*specialgraphs
- Unusual Sorting2909CodeChef
- Upgrading Cities2900Codeforcesdfs and similargraphs
- Upside Down3400Codeforcesdata structuresstring suffix structuresstringstrees
- Urban Planning3100Codeforcesconstructive algorithms
- Vabank3200Codeforcesbinary searchinteractive
- Variable Damage3000Codeforcesdata structuresflows
- Variables and Operations2800Codeforcesgraphsgreedyshortest paths
- Variance Challenge3400Codeforcesflowsgraphsgreedy
- Vasya and Polynomial2800Codeforcesmath
- Verifying Kingdom3200Codeforcesbinary searchdivide and conquerinteractivetrees
- Vertex Pairs2900Codeforcesbinary searchbrute forcedata structuresdfs and similar
- Very Long Suffix Array3393CodeChef
- Vibrating Paths (Challenge)3729CodeChef
- Victorious Coloring (Easy Version)2900Codeforcesdfs and similardpgreedy
- Victorious Coloring (Hard Version)3500Codeforcesdata structuresgreedyschedules
- Village Road Network3113CodeChef
- Viruses2900Codeforces*specialdpshortest pathsstring suffix structures
- Vishesh and his Hate for Even Numbers3002CodeChef
- Visible Black Areas2800Codeforcesdata structuresdsugeometrytrees
- Vladislav and a Great Legend3000Codeforcescombinatoricsdptrees
- Volcanic Eruptions3300Codeforcesdfs and similardpgreedyshortest paths
- Wakanda Forever3500Codeforces
- Warehouseman (Challenge)3543CodeChef
- Water Sort Puzzle (Challenge)3758CodeChef
- Water buckets3152CodeChef
- Wavy numbers2900Codeforcesbrute forcedfs and similarmeet-in-the-middlesortings
- Weak Subsequence3000Codeforcescombinatorics
- Weighed Tree Radius2800Codeforcesdata structuresdivide and conquerimplementationtrees
- Weighted Increasing Subsequences3200Codeforcesdata structuresdpmath
- Weird Chessboard3500Codeforcesconstructive algorithmsmath
- Weird Competition3175CodeChef
- Weird LCM Operations3000Codeforcesbrute forceconstructive algorithmsnumber theory
- Weird full graph4031CodeChef
- Welcome home, Chtholly3100Codeforcesdata structuresdsu
- What a Reversal3300Codeforcesconstructive algorithms
- Where Is the Root3145CodeChef
- Willy-nilly, Crack, Into Release!3500Codeforcesdata structuresdp
- Window Signals (easy version)3200Codeforces
- Window Signals (hard version)3500Codeforces
- Wine Factory (Hard Version)2800Codeforcesdata structuresdpflowsgreedy
- Winter Is Here3120CodeChef
- Wireless Electricity (Challenge)3651CodeChef
- Wise Men (Hard Version)3200Codeforcesbitmasksdpmath