1Gas StationMediumArrayGreedy
Solve → 2Number of IslandsMediumArrayDepth-First SearchBreadth-First Search
Solve → 3Bus RoutesHardArrayHash TableBreadth-First Search
Solve → 4Trapping Rain WaterHardArrayTwo PointersDynamic Programming
Solve → 5Subarray Sum Equals KMediumArrayHash TablePrefix Sum
Solve → 6Largest Rectangle in HistogramHardArrayStackMonotonic Stack
Solve → 7Gas StationMediumArrayGreedy
Solve → 8Number of IslandsMediumArrayDepth-First SearchBreadth-First Search
Solve → 9Bus RoutesHardArrayHash TableBreadth-First Search
Solve → 10Trapping Rain WaterHardArrayTwo PointersDynamic Programming
Solve → 11Subarray Sum Equals KMediumArrayHash TablePrefix Sum
Solve → 12Largest Rectangle in HistogramHardArrayStackMonotonic Stack
Solve → 13Longest Consecutive SequenceMediumArrayHash TableUnion-Find
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