Simplify Path
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. For more information, see: Absolute path vs relative path in Linux/Unix 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
Input: “/home/” Output: “/home” Explanation: Note that there is no trailing slash after the last directory name.
Solution
class Solution: def simplifyPath(self, path: str) -> str: trace = [p for p in path.split('/') if p!='.' and p!=''] stack = [] for t in trace: if t=='..': if len(stack)>0: stack.pop() else: stack.append(t) return '/'+'/'.join(stack)