摘要：Given two sequences pushed and popped with distinct values, return true if and only if this could have been the result of a sequence of push and pop o 阅读全文

摘要：Given an array of integers A, a move consists of choosing any , and incrementing it by . Return the least number of moves to make every value in uniqu 阅读全文

摘要：DynamoDB 是 AWS 全家桶中非常重要的一个服务，跟 MongoDB 一样，是 NoSQL 数据库。有时候我们需要将某个表的数据整个导出或者导入，如果数据量很大的话，建议使用 AWS Data Pipeline 导出和导入 DynamoDB，如果数据量不是特别大的话，建议使用 AWS CLI 阅读全文

摘要：We are given an array of lowercase letter strings, all of the same length. Now, we may choose any set of deletion indices, and for each string, we del 阅读全文

摘要：Given an array A of strings, find any smallest string that contains each string in A as a substring. We may assume that no string in A is substring of 阅读全文