2019年10月2日
LC 144. / 94. / 145. Binary Tree Preorder/ Inorder/ PostOrder Traversal
摘要： 题目描述 144. Binary Tree Preorder Traversal 94. Binary Tree Inorder Traversal 145. Binary Tree Postorder Traversal 前序排列 :根-左-右 中序排列: 左-根-右 后序排列:左-右-根 参考答 阅读全文
posted @ 2019-10-02 23:28 schaffen 阅读(161) 评论(0) 推荐(0)
LC 387. First Unique Character in a String
摘要： 题目描述 Given a string, find the first non-repeating character in it and return it's index. If it doesn't exist, return -1. Examples: Note: You may assum 阅读全文
posted @ 2019-10-02 01:11 schaffen 阅读(117) 评论(0) 推荐(0)