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)
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,