converting to array 100%beat
Intuition\n Describe your first thoughts on how to solve this problem. \n\n# Approach\n Describe your approach to solving the problem. \n\n# Complexity\n- Time 
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n\n# Complexity\n- Time complexity:\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space complexity:\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```\nclass Solution:\n    def isValidSerialization(self, preorder: str) -> bool:\n        pos = 1\n        for node in preorder.split(\',\'):\n            pos -= 1\n            if pos < 0:\n                return False\n            if node != \'#\':\n                pos += 2\n        if pos==0:\n            return True\n```
['String', 'Stack', 'Tree', 'Binary Tree', 'Python', 'Python3']