题目链接:Codeforces 444A DZY Loves Physics 题目大意:给出一张图,图中的每一个节点,每条边都有一个权值.如今有从中挑出一张子图,要求子图联通,而且被选中的随意两点.假设存在边,则一定要被选中.问说点的权值和/边的权值和最大是多少. 解题思路:是图论中的一个结论,最多两个节点.所以枚举两条边就能够了.我简单的推了一下,2个点的情况肯定比3个点的优. 如果有3个点a,b,c,权值分别为A,B.C 现a-b,b-c边的权值分别为u.v 那么对于两点的情况有A+Bu,B…

目录 @description@ @solution@ @accepted code@ @details@ @description@ 给定一个 n 点 m 边的图,边有边权,点有点权. 找到一个连通的诱导子图(选中的点之间的边必须选,选中的边的端点必须选),使得这个子图的密度最大. 密度的定义为:如果边权和为 0,则密度 = 0:否则密度 = 点权和 / 边权和. Input 第一行两个空格隔开的整数 n (1 ≤ n ≤ 500), m (1 ≤ m ≤ n*(n-1)/2). 第二行 n…

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A. DZY Loves Physics 题目连接: http://codeforces.com/contest/444/problem/A Description DZY loves Physics, and he enjoys calculating density. Almost everything has density, even a graph. We define the density of a non-directed graph (nodes and edges of th…

题目链接: 传送门 DZY Loves Chemistry time limit per test1 second     memory limit per test256 megabytes Description DZY loves Physics, and he enjoys calculating density. Almost everything has density, even a graph. We define the density of a non-directed gr…

题目大意:Codeforces 444C DZY Loves Colors 题目大意:两种操作,1是改动区间上l到r上面德值为x,2是询问l到r区间总的改动值. 解题思路:线段树模板题. #include <cstdio> #include <cstring> #include <cstdlib> #include <algorithm> using namespace std; const int maxn = 5*1e5; typedef long lo…

A. DZY Loves Physics time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output DZY loves Physics, and he enjoys calculating density. Almost everything has density, even a graph. We define the density…

A. DZY Loves Physics time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output DZY loves Physics, and he enjoys calculating density. Almost everything has density, even a graph. We define the density…

DZY Loves Chemistry Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 445B Description DZY loves chemistry, and he enjoys mixing chemicals. DZY has n chemicals, and m pairs of them will re…

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