#include <stdio.h> #include <set> #include <string.h> #include <algorithm> using namespace std; ; ; double minans; int vis[maxn];//记录选中的点 int mp[maxn][maxn], ans[maxn][maxn]; int min_road[maxn]; int Prim(int n) { ; int dis[maxn]; i…

Minimal Ratio Tree Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 32768/32768K (Java/Other) Total Submission(s) : 12   Accepted Submission(s) : 7 Font: Times New Roman | Verdana | Georgia Font Size: ← → Problem Description For a tree, which n…

想到枚举m个点,然后求最小生成树,ratio即为最小生成树的边权/总的点权.但是怎么枚举这m个点,实在不会.网上查了一下大牛们的解法,用dfs枚举,没想到dfs还有这么个作用. 参考链接:http://blog.csdn.net/xingyeyongheng/article/details/9373271 #include <stdio.h> #include <string.h> #include <set> #include <vector> #incl…

大家都说,搜索是算法的基础.今天最这题就有体会了.在n个顶点里选择m个顶点,求最小生成树.用到了深搜的回溯.所有情况都能枚举. #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> using namespace std; ,INF=0x3f3f3f3f; int dist[N],Map[N][N],pre[N]; //向外延伸的最短边长,记录图信息,记录连接信息…

hdu2489 Minimal Ratio Tree 题意:一个 至多  n=15 的 完全图 ,求 含有 m 个节点的树 使 边权和 除 点权和 最小 题解:枚举 m 个 点 ,然后 求 最小生成树 自己粗心....WA 了 好多次……(233333 ) #include <iostream> #include <cstring> #include <cstdio> #include <cmath> #include <algorithm> #…

Minimal Ratio Tree Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2382    Accepted Submission(s): 709 Problem Description For a tree, which nodes and edges are all weighted, the ratio of it is…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2489 Problem Description For a tree, which nodes and edges are all weighted, the ratio of it is calculated according to the following equation. Given a complete graph of n nodes with all nodes and edges…

Minimal Ratio Tree Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) [Problem Description] For a tree, which nodes and edges are all weighted, the ratio of it is calculated according to the following equation.Given a…

Minimal Ratio Tree Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 3345    Accepted Submission(s): 1019 Problem Description For a tree, which nodes and edges are all weighted, the ratio of it i…

Description For a tree, which nodes and edges are all weighted, the ratio of it is calculated according to the following equation. Given a complete graph of n nodes with all nodes and edges weighted, your task is to find a tree, which is a sub-graph…