题意:一个无向图,每个点有$a_i,b_i$,对任意点$i$你都可以花费$b_i$的费用将$a_i$变为$0$,最后你还要付出$\sum\limits_{i=1}^n\max\limits_{(i,j)}a_j$的费用,求最小费用 把每个点拆成两个点,对每条边新建一个点,将一个点的出边按终点的$a$从大到小排序后建图如下 只有让某个前缀$a_i$全部变为$0$,一个点产生的费用才会改变,这个建图保证了如果要割$a_i$就必须要割掉$b_{1\cdots i-1}$,并且不会割掉两个$a$ 听my…

题目大意:给你一个$n$个点,$m$条有向边的图,每个点有一个点权$a_i$,同时你可以用$b_i$的代价将$a_i$变为$0$ 另外你要付出$\sum\limits_{i=1}^n\max\limits_{(i,j)}a_j$这么多代价.请最小化代价. 数据范围:$n≤1000$,$m≤50000$. 貌似是一道套路最小割 把每个点拆成两个点,对每条边新建一个点,将一个点的出边按终点的$a$从大到小排序后建图如下 该建图方式,只有让某个前缀$a_i$全部变为$0$,一个点产生的费用才会改变,这…

D. Magic Numbers time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Consider the decimal presentation of an integer. Let's call a number d-magic if digit d appears in decimal presentation of…

A magic index in an array A[0...n-1] is defined to be an index such that A[i] = i. Given a sorted array of distinct integers, write a method to find a magic index, if one exists, in array A. FOLLOW UP What if the values are not distinct? public int g…

介绍 在Python中,所有以"__"双下划线包起来的方法,都统称为"Magic Method",例如类的初始化方法 __init__ ,Python中所有的魔术方法均在官方文档中有相应描述,但是对于官方的描述比较混乱而且组织比较松散.很难找到有一个例子. 构造和初始化 每个Pythoner都知道一个最基本的魔术方法, __init__ .通过此方法我们可以定义一个对象的初始操作.然而,当调用 x = SomeClass() 的时候, __init__ 并不是第一个…

F. Heroes of Making Magic III time limit per test:3 seconds memory limit per test:256 megabytes input:standard input output:standard output I’m strolling on sunshine, yeah-ah! And doesn’t it feel good! Well, it certainly feels good for our Heroes of…

Magic boy Bi Luo with his excited tree Problem Description Bi Luo is a magic boy, he also has a migic tree, the tree has N nodes , in each node , there is a treasure, it's value is V[i], and for each edge, there is a cost C[i], which means every time…

代码: int i = *reinterpret_cast<int*>(&(d += 6755399441055744.0)); 知识点: 1.reinterpret_cast<type_id> expression:type_id 必须是一个指针.引用.算术类型.函数指针或者成员指针.它可以把一个指针转换成一个整数,也可以把一个整数转换成一个指针(先把一个指针转换成一个整数,再把该整数转换成原类型的指针,还可以得到原先的指针值). 只是将bit表示进行了重新解读,不改变位…

New Features, Feature Enhancements and Behavior ChangesSubforms – Behavior Change for Unsupported Task ModeStarting with this version, if an Online task that is running in a Subform control cannot be executed, the task and the host task will remain o…

Magic xpa 2.5發佈 Magic xpa 2.5 Release Notes Magic xpa 2.5 Release NotesNew Features, Feature Enhancements and Behavior ChangesCall with Destination – Backward Compatibility EnhancementsIn Online, the following scenarios are now possible: Calling a p…