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0071_simplifyPath.py
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0071_simplifyPath.py
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# 0071 - Simplify Path
'''
Question:
Given a string path, which is an absolute path (starting with a slash '/')
to a file or directory in a Unix-style file system, convert it to the simplified canonical path.
In a Unix-style file system, a period '.' refers to the current directory,
a double period '..' refers to the directory up a level, and any multiple consecutive slashes (i.e. '//')
are treated as a single slash '/'. For this problem, any other format of periods such as '...' are treated
as file/directory names.
The canonical path should have the following format:
- The path starts with a single slash '/'.
- Any two directories are separated by a single slash '/'.
- The path does not end with a trailing '/'.
- The path only contains the directories on the path from the root directory to the target file or directory (i.e., no period '.' or double period '..')
- Return the simplified canonical path.
'''
class Solution(object):
def simplifyPath(self, path):
"""
:type path: str
:rtype: str
"""
stack = []
dirs = path.split("/")
for dir in dirs:
if dir == "." or not dir:
continue
elif dir == "..":
if stack:
stack.pop()
else:
stack.append(dir)
return "/" + "/".join(stack)
if __name__ == '__main__':
# path = "/home/"
# path = '/home/user/Documents/../../usr/local/bin'
# path = '/../'
# path = "/home//foo/"
path = "/a/../../b/../c//.//"
sol = Solution()
print(sol.simplifyPath(path))