Preorder Traversal

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,