题目传送门 /* 题意:求费马点 三分:对x轴和y轴求极值,使到每个点的距离和最小 */ #include <cstdio> #include <algorithm> #include <cstring> #include <cmath> ; const int INF = 0x3f3f3f3f; double x[MAXN], y[MAXN]; int n; double sum(double x1, double y1) { ; ; i<=n; +…

题目链接:http://poj.org/problem?id=2420 题意:给n个点,找出一个点,使这个点到其他所有点的距离之和最小,也就是求费马点. 参考链接:http://www.cnblogs.com/heaad/archive/2010/12/20/1911614.html 这一篇文章写的很好,我这个小白都有一点小明白了. 记一下笔记: 模拟退火: 就是在一定范围内接受一些不是最优的解,来跳出局部最优,靠近整体最优. 贴一下伪代码: //#pragma comment(linker,…

题目:http://poj.org/problem?id=2420 精度设成1e-17,做三遍.ans设成double,最后再取整. #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<cmath> #include<cstdlib> #include<ctime> #define db double usin…

题目:http://poj.org/problem?id=2420 给出 n 个点的坐标,求费马点: 上模拟退火. 代码如下: #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<cstdlib> #include<ctime> #include<cmath> #define eps 1e-17 #define…

A Star not a Tree? Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 4058   Accepted: 2005 Description Luke wants to upgrade his home computer network from 10mbs to 100mbs. His existing network uses 10base2 (coaxial) cables that allow you…

题目链接 居然1Y了,以前写的模拟退火很靠谱啊. #include <cstdio> #include <cstring> #include <string> #include <cmath> #include <ctime> #include <cstdlib> #include <iostream> using namespace std; struct point { double x,y; }p[]; int n;…

原文链接:https://www.dreamwings.cn/poj2420/2838.html A Star not a Tree? Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 5788   Accepted: 2730 Description Luke wants to upgrade his home computer network from 10mbs to 100mbs. His existing netw…

B - A Star not a Tree? Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=88808#problem/B Description Luke wants to upgrade his home computer network from 10mbs to 100mbs. His existing network uses 10ba…

A Star not a Tree? Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 3435   Accepted: 1724 Description Luke wants to upgrade his home computer network from 10mbs to 100mbs. His existing network uses 10base2 (coaxial) cables that allow you…

太虚假了. 我为什么要手贱点开submission? 这道题两天之前被一个学弟A了. ? 我退役了. 其实就是爬山吧..好像有的题解还分方向什么的完全没必要吧. #include <iostream> #include <cstdio> #include <cmath> #include <stdlib.h> #define pii pair<int,int> using namespace std; typedef double db; con…