LeetCode 1948: Delete Duplicate Folders in System Solution
Master LeetCode problem 1948 (Delete Duplicate Folders in System), a hard challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
1948. Delete Duplicate Folders in System
Problem Explanation
Explanation:
To solve this problem, we can use a Trie data structure to represent the folder structure. We will build the trie based on the input paths, and each node in the trie will represent a folder. Then, we can traverse the trie to identify and mark the duplicate folders and their subfolders. Finally, we can delete the marked folders and return the remaining paths.
Algorithm:
- Build a Trie using the input paths.
- Traverse the Trie to identify duplicate folders by comparing the children of each node.
- Mark the duplicate folders and their subfolders for deletion.
- Delete the marked folders.
- Return the remaining paths.
Time Complexity:
- Building the Trie: O(n * m), where n is the number of paths and m is the average length of a path.
- Traversing and marking the duplicate folders: O(n * m).
- Deleting the marked folders: O(n * m). Overall time complexity: O(n * m).
Space Complexity:
- Trie data structure: O(n * m).
- Recursive stack space during traversal: O(m). Overall space complexity: O(n * m).
:
Solution Code
class Solution {
public List<List<String>> deleteDuplicateFolder(List<List<String>> paths) {
// Java solution
}
}Try It Yourself
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