题目链接. 分析: 比POJ2253要简单些. AC代码: #include <iostream> #include <cstdio> #include <cstring> #include <cstdlib> #include <queue> #include <algorithm> #include <cmath> #include <string> #include <map> using n…

Description 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 highways so that i…

                                                                                                                Highways Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 23426   Accepted: 10829 Description The island nation of Flatopia is…

Description 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 highways so that i…

题目链接:点击打开链接 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 highways connecting…

Description 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 highways so that i…

点击打开链接 Highways Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 19004   Accepted: 8815 Description The island nation of Flatopia is perfectly flat. Unfortunately, Flatopia has no public highways. So the traffic is difficult in Flatopia.…

Highways Time Limit:1000MS     Memory Limit:10000KB     64bit IO Format:%I64d & %I64u Submit Status Practice POJ 1751 Appoint description:  System Crawler  (2015-06-02) Description The island nation of Flatopia is perfectly flat. Unfortunately, Flato…

题目链接:http://www.spoj.pl/problems/HIGH/ 题意:求最小生成树个数. #include<algorithm> #include<cstdio> #include<cmath> #include<cstring> #include<iostream> #define ll long long ][]; int n,m; ; int zero(double x){ ; else return x>eps; }…

http://poj.org/problem?id=2485 Description 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 t…

原题链接:http://codeforces.com/gym/100203/attachments/download/1702/statements.pdf 题解 给你平面上若干点,生成一颗完全图,让你生成一颗最小生成树.模板题.图中已经有了的边要将权值置0.代码是队友写的. 代码 #include <iostream> #include <cstring> #include <cstdlib> #include <cstdio> #include <…

Highways Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 22842   Accepted: 10525 Description The island nation of Flatopia is perfectly flat. Unfortunately, Flatopia has no public highways. So the traffic is difficult in Flatopia. The Fl…

题意:平面上n个点修路,已经修好了m条,再修若干条使得点之间连通,求最小代价的方案. 思路:基本上是裸的最小生成树了,我这里存边直接存在multyset了,取的时候也比较方便,我本来就是这么考虑的,队友打了一发朴素的排序的超时了. #include <iostream> #include <cstdio> #include <fstream> #include <algorithm> #include <cmath> #include <d…

最短路径: poj1125 - Stockbroker Grapevine(多源最短路径,floyd) poj1502 - MPI Maelstrom(单源最短路径,dijkstra,bellman-ford,spfa) poj1511 - Invitation Cards(单源来回最短路径,spfa邻接表) poj1797 - Heavy Transportation(最大边,最短路变形,dijkstra,spfa,bellman-ford) poj2240 - Arbitrage(汇率问题,…

poj:1258 Agri-Net Time Limit: 1000 MS Memory Limit: 10000 KB 64-bit integer IO format: %I64d , %I64u Java class name: Main [Submit] [Status] [Discuss] Description Farmer John has been elected mayor of his town! One of his campaign promises was to bri…

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…

[POJ 2485] Highways 最小生成树模板 Prim #include using namespace std; int mp[501][501]; int dis[501]; bool vis[501]; int n; int Prim() { int i,j,w,p,mm = 0; memset(dis,-1,sizeof(dis)); memset(vis,0,sizeof(vis)); dis[1] = 0; for(i = 0; i < n; ++i) { w = INF;…

POJ 1258 Agri-Net http://poj.org/problem?id=1258 水题. 题目就是让你求MST,连矩阵都给你了. prim版 #include<cstdio> const int MAXN=101; const int INF=100000+10; int map[MAXN][MAXN]; int dis[MAXN]; int n; void prim() { bool vis[MAXN]={0}; for(int i=0;i<=n;i++) dis[i]…

1.POJ2485 Highways 蛮水的 数组一开始开小了卡了一会儿 我可能是个傻逼 #include<iostream> #include<cstdio> #include<cstdlib> #include<cstring> #include<algorithm> #include<string> using namespace std; ]; int find(int x){ return f[x]==x?x:f[x]=fi…

POJ图论分类[转] 一个很不错的图论分类,非常感谢原版的作者!!!在这里分享给大家,爱好图论的ACMer不寂寞了... (很抱歉没有找到此题集整理的原创作者,感谢知情的朋友给个原创链接) POJ:http://poj.org/ 1062* 昂贵的聘礼 枚举等级限制+dijkstra 1087* A Plug for UNIX 2分匹配 1094 Sorting It All Out floyd 或 拓扑 1112* Team Them Up! 2分图染色+DP 1125 Stockbroker…

Highways 题目链接: http://acm.hust.edu.cn/vjudge/contest/124434#problem/G 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 an…

问题:POJ2485 本题求解生成树最大边的最小值 分析: 首先证明生成树最大边的最小值即最小生成树的最大边. 假设:生成树最大边的最小值比最小生成树的最大边更小. 不妨设C为G的一个最小生成树,e是其中的最大边.把e从C中去除,则C被分成C1,C2两个连通子集.假设存在最大边小于e的生成树CC,则CC中连接C1,C2两个点集的桥ee必定小于e.把C中的e换成ee,则 C1,C2,ee必定也生成一个生成树.该生成树长度小于C,与C是最小生成树的事实矛盾,故假设不成立. 因此必有: 生成树最大边的…

Highways Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 21628   Accepted: 9970 Description The island nation of Flatopia is perfectly flat. Unfortunately, Flatopia has no public highways. So the traffic is difficult in Flatopia. The Fla…

Highways Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 23070   Accepted: 6760   Special Judge Description The island nation of Flatopia is perfectly flat. Unfortunately, Flatopia has a very poor system of public highways. The Flatopian…

题目链接 Description The islandnation of Flatopia is perfectly flat. Unfortunately, Flatopia has no publichighways. So the traffic is difficult in Flatopia. The Flatopian government isaware of this problem. They're planning to build some highways so that…

链接: http://poj.org/problem?id=2485 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=22010#problem/H Highways Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 18668   Accepted: 8648 Description The island nation of Flatopia is perfect…

Description 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 highways so that i…

#include<stdlib.h> #include<stdio.h> #include<queue> struct vertex//代表一个村庄 { int minDist;//到相邻结点的最小的距离 bool inMST;//这个村庄是否已经被走过 }; int case_num=0;//用例数 int village_num; //村庄的数目 int edge[500][500]; vertex* vertices=NULL;//指向结构体 村庄 的首地址 in…

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…

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…