刘好念

摘要： 一、背景 最近要开一门新课，数据库综合实习，需要实现一个图形化界面程序对SqlServer数据库进行操作，在安装好Sqlserver之后选择使用pyqt实现图形化界面。 初步设计在主界面中分为左边菜单栏和右边显示栏，需要在主窗口中嵌套一个窗口，即右边显示栏。并且需要动态改变右边的窗口。 在查相关博客 阅读全文

摘要： 一、题意 You are given a string s containing lowercase letters and an integer k. You need to : First, change some characters of s to other lowercase Engli 阅读全文

摘要： 一、题意 A supply chain is a network of retailers（零售商）, distributors（经销商）, and suppliers（供应商）-- everyone involved in moving a product from supplier to cus 阅读全文

摘要： 一、题意 A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only n 阅读全文

摘要： 一、题意 Given an array of integers, return the maximum sum for a non-empty subarray (contiguous elements) with at most one element deletion. In other wor 阅读全文

摘要： 一、题意 Given a string s, we make queries on substrings of s. For each query queries[i] = [left, right, k], we may rearrange the substring s[left], ..., 阅读全文

摘要： 一、题意 A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only n 阅读全文

摘要： 一、题意 Given any permutation of the numbers {0, 1, 2,..., N−1}, it is easy to sort them in increasing order. But what if Swap(0, *) is the ONLY operatio 阅读全文

摘要： 一、题意 In graph theory, an Eulerian path is a path in a graph which visits every edge exactly once. Similarly, an Eulerian circuit is an Eulerian path w 阅读全文

摘要： 一、题意 There is a classical process named partition in the famous quick sort algorithm. In this process we typically choose one element as the pivot. Th 阅读全文