Single File Programming QuestionGiven 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:l The path starts with a single slash '/'.l Any two directories are separated by a single slash '/'.l The path does not end with a trailing '/'.l 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. Test Case #1Input/home/ Output/home Explanation:There is no trailing slash after the last directory name Test Case #2Input/../ 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.
Question
Single File Programming QuestionGiven 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:l The path starts with a single slash '/'.l Any two directories are separated by a single slash '/'.l The path does not end with a trailing '/'.l 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. Test Case #1Input/home/ Output/home Explanation:There is no trailing slash after the last directory name Test Case #2Input/../ 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.
Solution
This problem can be solved using a stack data structure. Here are the steps to solve this problem:
- Initialize an empty stack.
- Split the input path by '/' to get a list of directories.
- Iterate over the list of directories:
- If the directory is empty or '.', continue to the next iteration.
- If the directory is '..', pop an element from the stack if it's not empty.
- Otherwise, push the directory into the stack.
- Finally, join the elements in the stack with '/' and return the result.
Here is a Python solution for the problem:
def simplifyPath(path):
stack = []
for dir in path.split('/'):
if dir == '' or dir == '.':
continue
elif dir == '..':
if stack:
stack.pop()
else:
stack.append(dir)
return '/' + '/'.join(stack)
This function works by maintaining a stack of directories. When it encounters '..', it pops the top directory from the stack, effectively moving up one level. When it encounters a regular directory, it pushes it onto the stack. The result is a simplified canonical path.
Similar Questions
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