题面传送门 解决思路 本题数据范围较小,可以使用模拟退火算法(随机化). 顾名思义,模拟退火就是一个类似于降温的过程.先设置一个较大的初温,每次随机改变状态,若使答案更优,则采取更优答案,否则根据其与当前最优答案的差值,一定概率保留这个较不优的答案.这时为了防止答案陷入局部最优的情况: 比如下图,陷入局部最优解 \(1\) 的状态后,需要一定的概率跳出来(蓝色虚线),到 \(2\) 处寻找全局最优解. 关于跳出的概率,遵循 『 \(\text{Metropolis}\) 接受准则 』: 设 \(…

[返回模拟退火略解] 题目描述 一平面上有 nnn 个点 {Ai}\{A_i\}{Ai​},求一个点 XXX 使得σ=∑i=1ndis(Ai,X)\sigma=\sum_{i=1}^{n}{dis(A_i,X)}σ=i=1∑n​dis(Ai​,X)的值最小.求 σmin⁡\sigma_{\min}σmin​. Solution 10228\text{Solution 10228}Solution 10228 SA 模板. 对于每个温度 τ\tauτ,尝试找一个新解. 若新解更优,则接受:若新解次…

好的,在h^ovny的安利下做了此题 模拟退火中的大水题,想当年联赛的时候都差点打了退火,正解貌似是三分套三分,我记得上一道三分套三分的题我就是退火水过去的... 貌似B班在讲退火这个大玄学... 这题还是比较简单的啦~ 随机化坐标x,y就可以啦 然而格式错了n遍.....死的心都有了 最后输出是四舍五入!!!四舍五入!!!四舍五入!!! 两组答案中间有空行!!!有空行!!!有空行!!!   然后只要会退火的板子就可以啦 //LevenKoko#include<bits/stdc++.h> u…

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…

题目链接 pojA Star not a Tree? 题解 啊,模拟退火是个好东西 模拟退火即可 代码 #include<cmath> #include<cstdio> #include<algorithm> inline int read() { int x = 0,f = 1; char c = getchar(); while(c < '0' || c > '9')c = getchar(); while(c <= '9' &&…

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…

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…

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…

题目链接:uva 10228 - Star not a Tree? 题目大意:给定若干个点,求费马点(距离全部点的距离和最小的点) 解题思路:模拟退火算法,每次向周围尝试性的移动步长,假设发现更长处,则转移.每次操作之后降低步长后做相同的操作,直到步长小于指定精度. #include <cstdio> #include <cstring> #include <cmath> #include <cstdlib> #include <ctime> #…

http://write.blog.csdn.net/postedit A Star not a Tree? Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 3751   Accepted: 1858 Description Luke wants to upgrade his home computer network from 10mbs to 100mbs. His existing network uses 10ba…