题目连接 http://poj.org/problem?id=3625 Building Roads Description Farmer John had just acquired several new farms! He wants to connect the farms with roads so that he can travel from any farm to any other farm via a sequence of roads; roads already conn…

题目 //最小生成树,只是变成二维的了 #define _CRT_SECURE_NO_WARNINGS #include<stdlib.h> #include<stdio.h> #include<iostream> #include<string.h> #include<algorithm> #include<math.h> using namespace std; #define inf 999999999 #define M 10…

HDU 1815, POJ 2749 Building roads pid=1815" target="_blank" style="">题目链接HDU 题目链接POJ 题意: 有n个牛棚, 还有两个中转站S1和S2, S1和S2用一条路连接起来. 为了使得随意牛棚两个都能够有道路联通,如今要让每一个牛棚都连接一条路到S1或者S2. 有a对牛棚互相有仇恨,所以不能让他们的路连接到同一个中转站. 还有b对牛棚互相喜欢,所以他们的路必须连到同一个中专站.…

Building roads Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 6229   Accepted: 2093 Description Farmer John's farm has N barns, and there are some cows that live in each barn. The cows like to drop around, so John wants to build some ro…

原题 2-SAT+二分答案! 最小的最大值,这肯定是二分答案.而我们要2-SATcheck是否在该情况下有可行解. 对于目前的答案limit,首先把爱和恨连边,然后我们n^2枚举每两个点通过判断距离来实现连边,然后跑2-SAT判断是否有可行解 O(n^2logn) 想起来和听起来都很难写,事实上还好吧- #include<cstdio> #include<algorithm> #include<stack> #include<cstring> #define…

把爱恨和最大距离视为限制条件,可以知道,最大距离和限制条件多少具有单调性 所以可以二分最大距离,加边+check #include<cstdio> #include<algorithm> #include<cstring> #include<vector> #include<stack> #define N 5010 #define INF 4000000 using namespace std; ],love[N][],indx,inst[N]…

Building roads Time Limit: 10000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 34 Accepted Submission(s): 13   Problem Description Farmer John's farm has N barns, and there are some cows that live in each barn.…

Building roads Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 8153   Accepted: 2772 Description Farmer John's farm has N barns, and there are some cows that live in each barn. The cows like to drop around, so John wants to build some ro…

poj   1251  Jungle Roads  (最小生成树) Link: http://poj.org/problem?id=1251 Jungle Roads Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 23507   Accepted: 11012 Description The Head Elder of the tropical island of Lagrishan has a problem. A b…

POJ 3411 Paid Roads Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 6553   Accepted: 2430 Description A network of m roads connects N cities (numbered from 1 to N). There may be more than one road connecting one city with another. Some o…