leetcode------Simplify Path
标题: |
Simplify Path |
通过率: | 20.1% |
难度: | 中等 |
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"
.
这个题要了解linux文件命令,“..”意思是返回上级,"."或者空""是本级的意思,
那么将path分片遇到"."或者""跳过,遇到".."弹栈,其他情况进栈,
还要一种情况就是path本身就是空,那么在整个循环结束够进栈一个空值。
代码如下:
1 class Solution: 2 # @param path, a string 3 # @return a string 4 def simplifyPath(self, path): 5 pathSplit=path.split("/") 6 stack=[] 7 res="" 8 for i in range(len(pathSplit)): 9 if pathSplit[i] =="." or len(pathSplit[i])==0 : 10 continue; 11 elif pathSplit[i] =="..": 12 if len(stack)!=0: 13 stack.pop() 14 else: stack.append(pathSplit[i]) 15 if len(stack)==0: 16 stack.append("") 17 while len(stack)!=0: 18 res+="/"+stack.pop(0) 19 return res 20
简化版:
1 class Solution: 2 # @param path, a string 3 # @return a string 4 def simplifyPath(self, path): 5 pathSplit=path.split("/") 6 stack=[] 7 for ps in pathSplit: 8 if ps !="." and ps!=".." and ps : 9 stack.append(ps) 10 elif ps ==".." and stack : 11 stack.pop() 12 return "/"+"/".join(stack)