CF1580E Railway Construction 铁路系统中有 \(n\) 个车站和 \(m\) 条双向边,有边权,无重边.这些双向边使得任意两个车站互相可达. 你现在要加一些单向边 \((u,v,w)\) ,\(w\) 随便定,代价是 \(a_u\) ,使得从 \(1\) 号车站出发到每个车站都有至少两条边不相交的路线,并且最短路不改变. 由于不可控因素,\(a\) 序列会受到 \(q\) 次修改,每次让 \(a_u \leftarrow a_u+x\) ,并求当前的最小代价. \(1…

Construction of Primitives in Open Cascade eryar@163.com 一.创建基本图元 Making Primitives 将用到如下的类创建基本图元,包括长方体(Box).楔形体(Wedge).旋转体(Revol)等.这些类提供Shell和Solid函数来返回实体(solid)和壳(shell). 使用方法都是调用这些类的构造函数,输入相应的参数,直接构造出基本图元.构造函数的参数不同,创建的基本几何实体的形状也会不同. 注:所有旋转体的角度值都是弧…

Tree Construction Problem's Link ---------------------------------------------------------------------------- Mean: 给定n个数,按照构造Binary Search Tree的方式来构造BST树,按顺序输出每一个非root结点的父节点的值. analyse: 构造BST树最坏情况下时间复杂度为O(n),肯定会超时. 注意到只需要输出结点的父节点的值,不需要真的构造BST树. 插到第i…

2080: [Poi2010]Railway Time Limit: 10 Sec  Memory Limit: 259 MBSubmit: 140  Solved: 35[Submit][Status][Discuss] Description 一个铁路包含两个侧线1和2,右边由A进入,左边由B出去(看下面的图片)    有n个车厢在通道A上,编号为1到n,它们被安排按照要求的顺序(a1,a2,a3,a4....an)进入侧线,进去还要出来,它们要按照编号顺序(1,2,3,4,5....n)从…

题目链接: 传送门 Graph Construction Time Limit: 3000MS     Memory Limit: 65536K Description Graph is a collection of edges E and vertices V. Graph has a wide variety of applications in computer. There are different ways to represent graph in computer. It can…

time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are distinct) and positioned…

题目 Source https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=4261 Description You are working for the International Company for Pool Construction, a construction company which specializes in buildin…

Sorting Railway Cars time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are dist…

[construction of tuples containing 0 or 1 items] the syntax has some extra quirks to accommodate these. Empty tuples are constructed by an empty pair of parentheses; a tuple with one item is constructed by following a value with a comma (it is not su…

Description During the programming classes Vasya was assigned a difficult problem. However, he doesn't know how to code and was unable to find the solution in the Internet, so he asks you to help. You are given a sequence a, consisting of ndistinct i…