摘要： Given an array ofnpositive integers and a positive integers, find the minimal length of a subarray of which the sum ≥s. If there isn't one, return 0 i... 阅读全文

摘要： Trie树又被称为字典树、前缀树，是一种用于快速检索的多叉树。Tried树可以利用字符串的公共前缀来节省存储空间。但如果系统存在大量没有公共前缀的字符串，相应的Trie树将非常消耗内存。（下图为Wiki上的Trie树示意图， https://en.wikipedia.org/wiki/Trie）子节... 阅读全文

摘要： There are a total ofncourses you have to take, labeled from0ton - 1.Some courses may have prerequisites, for example to take course 0 you have to firs... 阅读全文