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  • [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
            
                
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  • 原文地址:https://www.cnblogs.com/xuanlu/p/11785568.html
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