[LC] 71. Simplify Path

Given an absolute path for a file (Unix-style), simplify it. Or in other words, convert it to the canonical path.

In a UNIX-style file system, a period . refers to the current directory. Furthermore, a double period .. moves the directory up a level. For more information, see: Absolute path vs relative path in Linux/Unix

Note that the returned canonical path must always begin with a slash /, and there must be only a single slash / between two directory names. The last directory name (if it exists) must not end with a trailing /. Also, the canonical path must be the shortest string representing the absolute path.

Example 1:

Input: "/home/"

Output: "/home"

Explanation: Note that there is no trailing slash after the last directory name.

Example 2:

Input: "/../"

Output: "/"

Explanation: Going one level up from the root directory is a no-op, as the root level is the highest level you can go.

Example 3:

Input: "/home//foo/"

Output: "/home/foo"

Explanation: In the canonical path, multiple consecutive slashes are replaced by a single one.

Example 4:

Input: "/a/./b/../../c/"

Output: "/c"

Example 5:

Input: "/a/../../b/../c//.//"

Output: "/c"

Example 6:

Input: "/a//b////c/d//././/.."

Output: "/a/b/c"

class Solution:

    def simplifyPath(self, path: str) -> str:

        import re

        lst = re.split('/+', path)

        stack = []

        for item in lst:

            if item == '..':

                if stack:

                    stack.pop()

            elif item and item != '.':

                stack.append(item)

            else:

                continue

        res = '/' + '/'.join(stack)

        return res

巴特西

[LC] 71. Simplify Path

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