摘要: Given the root of a binary tree, return the preorder traversal of its nodes' values. Example 1: Input: root = [1,null,2,3] Output: [1,2,3] Example 2: 阅读全文
posted @ 2019-12-16 12:47 CNoodle 阅读(456) 评论(0) 推荐(0) 编辑