Package g1201_1300.s1233_remove_sub_folders_from_the_filesystem

Class Solution

  • public class Solution
extends Object
    1233 - Remove Sub-Folders from the Filesystem.

    Medium

    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.

    • Constructor Detail

      • Solution

        public Solution()

    • Method Detail