Highways Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 14819   Accepted: 4278   Special Judge Description The island nation of Flatopia is perfectly flat. Unfortunately, Flatopia has a very poor system of public highways. The Flatopian…

Highways Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 13182   Accepted: 3814   Special Judge Description The island nation of Flatopia is perfectly flat. Unfortunately, Flatopia has a very poor system of public highways. The Flatopian…

http://poj.org/problem?id=1751 Description The island nation of Flatopia is perfectly flat. Unfortunately, Flatopia has a very poor system of public highways. The Flatopian government is aware of this problem and has already constructed a number of h…

题意: 给你N个城市的坐标,城市之间存在公路,但是由于其中一些道路损坏了,需要维修,维修的费用与公路长成正比(公路是直的). 但现有M条公路是完整的,不需要维修,下面有M行,表示不需要维修的道路两端的城市,问最短费用. 思路: lowcost[i]数组存还未处理的城市i离已经处理过的城市的最短距离,pre[i]]数组存还未处理的城市i离已经处理过的哪个城市最近. 代码: prime: #include <iostream> #include <cstdio> #define inf…

题目链接    http://poj.org/problem?id=1751 题目大意:输入n:然后给你n个点的坐标(任意两点之间皆可达):输入m:接下来m行每行输入两个整数x,y表示 点x与点y 已经相连: 问连接所有点至少还需要连接哪些点(并且使连接后总距离最短),并输出连接的点对. 思路:最小生成树,用prim或者kruskal,我是用prim写的, 所以处理已连接的m个点对时,只需将两个点之间的距离设为0即可,这样进行算法时, 会优先处理已连接的点.然后输出点对时,判断下d[i]是否为0…

风萧萧兮易水寒,壮士要去敲代码.本女子开学后再敲了.. poj1258 Agri-Net(最小生成树)水题. #include<cstdio> #include<cstring> #include<algorithm> using namespace std; const int inf=0x3f3f3f3f; ; int n,m; int g[N][N],low[N]; void prim(int u0){ ; ;i<n;++i){ low[i]=g[u0][i…

Highways POJ-1751 最小生成树 Prim算法 题意 有一个N个城市M条路的无向图,给你N个城市的坐标,然后现在该无向图已经有M条边了,问你还需要添加总长为多少的边能使得该无向图连通.输出需要添加边的两端点编号即可. 解题思路 这个可以使用最短路里面的Prim算法来实现,对于已经连接的城市,处理方式是令这两个城市之间的距离等于0即可. prim算法可以实现我们具体的路径输出,Kruskal算法暂时还不大会. 代码实现 #include<cstdio> #include<cs…

The island nation of Flatopia is perfectly flat. Unfortunately, Flatopia has a very poor system of public highways. The Flatopian government is aware of this problem and has already constructed a number of highways connecting some of the most importa…

Highways POJ-1751 注意这里的样例答案也是对的,只是输出顺序改变,但是这也没关系,因为题目加了特殊判断. #include<iostream> #include<cstring> #include<string> #include<algorithm> #include<cstdio> #include<cmath> using namespace std; const int maxn=755; const int…

总时间限制: 1000ms 内存限制: 65536kB描述The island nation of Flatopia is perfectly flat. Unfortunately, Flatopia has no public highways. So the traffic is difficult in Flatopia. The Flatopian government is aware of this problem. They're planning to build some h…