144. Binary Tree Preorder Traversal 144. Binary Tree Preorder Traversal # Definition for a binary tree
255. Verify Preorder Sequence in Binary Search Tree 255. Verify Preorder Sequence in Binary Search Tree 遞迴(超時)
589. N-ary Tree Preorder Traversal 589. N-ary Tree Preorder Traversal """ # Definition for a Node. class
105. Construct Binary Tree from Preorder and Inorder Traversal 105. Construct Binary Tree from Preorder and Inorder Traversal 這一題的重點是,