摘要: 题目: Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example,Given n = 3, there are a total of 5 unique 阅读全文
posted @ 2017-05-29 10:40 荒野第一快递员 阅读(198) 评论(0) 推荐(0) 编辑
摘要: 题目: A message containing letters from A-Z is being encoded to numbers using the following mapping: Given an encoded message containing digits, determi 阅读全文
posted @ 2017-05-29 09:07 荒野第一快递员 阅读(1385) 评论(2) 推荐(0) 编辑