店面
实现类似输入一个单词，找出所有以此单词开头的所有单词。 用trie实现。
synchronization mechanism in Java, inheritance in Java
explain polymorphism, explain inheritance, explain thread vs process
Given a dictionary of words and a string of digits (e.g., 463), return a list of words that are formed by mapping the digits. From 1point 3acres bbs
with the phone pad lookup and are also in the dictionary.
For example:
dictionary: god, cat
digits: 463
return [god]
onsite 如下：
蠡口 哟刘玲
单链表找中间节点
蠡口 儿刘吧
算法 菲比纳妾
蠡口 要死留
系统设计 文件系统