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0. 链接
1. 题目
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.
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"
2. 思路1：先用/分割+再组合
先用/分割
再组合：过程中遇到..尝试从结果列表中pop，遇到.忽略, 遇到''忽略, 否则添加到结果列表
3. 代码
class Solution1:
def simplifyPath(self, path: str) -> str:
array = path.split('/')
result = list()
for each in array:
if each == '..':
if len(result) > 0:
result.pop()
continue
elif each == '.':
continue
elif len(each) == 0:
continue
result.append(each)
return '/' + '/'.join(result)
solution = Solution1()
print(solution.simplifyPath('/home/'))
print(solution.simplifyPath('/../'))
print(solution.simplifyPath('/home//foo/'))
print(solution.simplifyPath('/a/./b/../../c/'))
print(solution.simplifyPath('/a/../../b/../c//.//'))
print(solution.simplifyPath('/a//b////c/d//././/..'))
输出结果
/home
/
/home/foo
/c
/c
/a/b/c
4. 结果
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