Binary Tree PreOrder Traversal

LeetCode provides methods for binary tree traversals. PreOrder Traversal follows a Root, Left, Right sequence, while InOrder Traversal follows Left, Root, Right. Both recursive implementations maintain O(N) time complexity and O(H) space complexity. For InOrder Traversal, an alternative approach uses an explicit stack. The optimal Morris InOrder Traversal aims to perform the process without recursion or a stack, achieving O(1) extra space while maintaining the O(N) time complexity for the traversal.