1Design Add and Search Words Data StructureMediumStringDepth-First SearchDesign
Solve → 2Wildcard MatchingHardStringDynamic ProgrammingGreedy
Solve → 3Count Palindromic SubsequencesHardStringDynamic Programming
Solve → 4Serialize and Deserialize Binary TreeHardStringTreeDepth-First Search
Solve → 5Design Add and Search Words Data StructureMediumStringDepth-First SearchDesign
Solve → 6Count Palindromic SubsequencesHardStringDynamic Programming
Solve → 7Wildcard MatchingHardStringDynamic ProgrammingGreedy
Solve → 8Serialize and Deserialize Binary TreeHardStringTreeDepth-First Search
Solve →