Leetcode Problem 1948. Delete Duplicate Folders in System

1948. Delete Duplicate Folders in System

Leetcode Solutions

Serialize Subtrees and Hashing

  1. Build a trie from the given paths.
  2. Serialize each subtree in the trie to a unique string representation.
  3. Use a hash map to record the occurrence of each serialized subtree.
  4. Mark subtrees for deletion if their serialized form is found more than once in the hash map.
  5. Traverse the trie and collect the paths that are not marked for deletion.
  6. Return the list of remaining folder paths.
UML Thumbnail

Build Tree and Post-order Traversal

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