Problem URL: Simplify path

First we will split the the path with / as delimeter. Then we iterate over the items of the path, if the item is . or empty, we just ignore it. If the item is anything but .., then we append it to a stack, else we pop it from the stack. When the iteration is done, we join the elements of the stack with / and return.

class Solution:
    def simplifyPath(self, path: str) -> str:
        stack = []
        path = path.split('/')

        for item in path:
            if item == '' or item == '.':
                continue
            if item == '..':
                if stack: 
                    stack.pop()
            else:
                stack.append(item)

        return '/' + '/'.join(stack)

Time Complexity: O(n)
Space Complexity: O(n)