1Longest Substring Without Repeating CharactersMediumHash TableStringSliding Window
Solve → 2All Nodes Distance K in Binary TreeMediumHash TableTreeDepth-First Search
Solve → 3Maximum Frequency StackHardHash TableStackDesign
Solve → 4Word LadderHardHash TableStringBreadth-First Search
Solve → 5Sort Characters By FrequencyMediumHash TableStringSorting
Solve → 6Number of AtomsHardHash TableStringStack
Solve → 7LRU CacheMediumHash TableLinked ListDesign
Solve → 8Amount of Time for Binary Tree to Be InfectedMediumHash TableTreeDepth-First Search
Solve → 9Map Sum PairsMediumHash TableStringDesign
Solve → 10Amount of Time for Binary Tree to Be InfectedMediumHash TableTreeDepth-First Search
Solve → 11Longest Substring Without Repeating CharactersMediumHash TableStringSliding Window
Solve → 12All Nodes Distance K in Binary TreeMediumHash TableTreeDepth-First Search
Solve → 13Maximum Frequency StackHardHash TableStackDesign
Solve → 14Word LadderHardHash TableStringBreadth-First Search
Solve → 15Sort Characters By FrequencyMediumHash TableStringSorting
Solve → 16Number of AtomsHardHash TableStringStack
Solve → 17LRU CacheMediumHash TableLinked ListDesign
Solve → 18Map Sum PairsMediumHash TableStringDesign
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