1233. Remove Sub-Folders from the Filesystem
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Given a list of folders, remove all sub-folders in those folders and return in any order the folders after removing.
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.
给一堆文件列表,删掉所有的子文件夹。给出最后剩下的文件夹路径
这个其实只需要安字典序排序,然后判断i和i+1是不是包含关系就可以了,如果包含,就丢弃i+1,继续往后看,如果不包含,那i和i+2,i+3也不可能是包含关系了,就可以把i+1也加到答案里去,接下来去判断i+1和后面的是否包含,重复这个过程。有个比较需要注意的地方是,如果判断i是i+1的上层目录,除了判断s1 == s2[:len(s1)]以外还要判断s2[len(s1)]是不是‘/‘。
class Solution(object): def removeSubfolders(self, folder): """ :type folder: List[str] :rtype: List[str] """ folder = sorted(folder) ans = [] for f in folder: if len(ans) == 0 or ans[-1] != f[:len(ans[-1])] or f[len(ans[-1])] != ‘/‘: ans.append(f) return ans
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