1233. Remove Sub-Folders from the Filesystem
https://leetcode.com/problems/remove-sub-folders-from-the-filesystem
Description
Given a list of folders folder
, return the folders after removing all sub-folders in those folders. You may return the answer in any order.
If a folder[i]
is located within another folder[j]
, it is called a sub-folder of it.
The format of a path is one or more concatenated strings of the form: '/'
followed by one or more lowercase English letters.
For example,
"/leetcode"
and"/leetcode/problems"
are valid paths while an empty string and"/"
are not.
Example 1:
**Input:** folder = ["/a","/a/b","/c/d","/c/d/e","/c/f"]
**Output:** ["/a","/c/d","/c/f"]
**Explanation:** Folders "/a/b/" is a subfolder of "/a" and "/c/d/e" is inside of folder "/c/d" in our filesystem.
Example 2:
**Input:** folder = ["/a","/a/b/c","/a/b/d"]
**Output:** ["/a"]
**Explanation:** Folders "/a/b/c" and "/a/b/d/" will be removed because they are subfolders of "/a".
Example 3:
**Input:** folder = ["/a/b/c","/a/b/ca","/a/b/d"]
**Output:** ["/a/b/c","/a/b/ca","/a/b/d"]
Constraints:
1 <= folder.length <= 4 * 104
2 <= folder[i].length <= 100
folder[i]
contains only lowercase letters and'/'
.folder[i]
always starts with the character'/'
.Each folder name is unique.
ac
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