71. Simplify Path 简化路径


【LeetCode】71. Simplify Path 解题报告(Python)

标签(空格分隔): LeetCode

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.me/


题目地址:https://leetcode.com/problems/simplify-path/description/

题目描述:

Given an absolute path for a file (Unix-style), simplify it.

For example,

path = "/home/", => "/home"
path = "/a/./b/../../c/", => "/c"

Corner Cases:

  • Did you consider the case where path = "/../"? In this case, you should return "/".

  • Another corner case is the path might contain multiple slashes '/' together, such as "/home//foo/". In this case, you should ignore redundant slashes and return "/home/foo".

题目大意

简化linux路径。

解题方法

看到这种来来回回,增增删删的题,一般都想到用栈。

我们把字符串按照/分割之后就得到了每个文件的目录,然后判断路径是添加还是向上层进行返回。这个题很简单了。

有一个地方犯了小错误,不能写成if dir == '..' and stack: stack.pop()。这样的话如果栈是空的,就把..进栈了。

class Solution(object):
    def simplifyPath(self, path):
        """
        :type path: str
        :rtype: str
        """
        stack = list()
        dirs = path.split('/')
        for dir in dirs:
            if not dir or dir == '.':
                continue
            if dir == '..':
                if stack:
                    stack.pop()
            else:                
                stack.append(dir)
        return '/' + '/'.join(stack)

日期

2018 年 6 月 26 日 ———— 早睡早起