71. Simplify Path - LeetCode

class Solution1:
    def simplifyPath(self, path: str) -> str:
        stack = []
        for p in path.split('/'):
            if p == '..':
                stack.pop() if stack else None
            elif p and p != '.':
                stack.append(p)
        return '/' + '/'.join(stack)


class Solution:
    def simplifyPath(self, path: str) -> str:
        stack = []
        for p in path.split('/'):
            d = {'': stack, '.': stack, '..': stack[:-1]}
            stack = d.get(p, stack + [p])
        return '/' + '/'.join(stack)