1.质量集中在顶点上.n个顶点坐标为(xi,yi),质量为mi,则重心(∑( xi×mi ) / ∑mi, ∑( yi×mi ) / ∑mi) 2.质量分布均匀.这个题就是这一类型,算法和上面的不同. 特殊地,质量均匀的三角形重心:(( x0 + x1 + x2 ) / 3,Y = ( y0 + y1 + y2 ) / 3) 以(0,0)为顶点三角剖分之后求三角形重心,把重心连起来转换成质量集中在顶点上的情况求解即可 #include<iostream> #include<cstdio&…

Lifting the Stone Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 5370 Accepted Submission(s): 2239 Problem Description There are many secret openings in the floor which are covered by a big heavy…

http://acm.hdu.edu.cn/showproblem.php?pid=1115 引用博客:https://blog.csdn.net/ysc504/article/details/8812339 //①质量集中在顶点上 // n个顶点坐标为(xi,yi),质量为mi,则重心 // X = ∑( xi×mi ) / ∑mi // Y = ∑( yi×mi ) / ∑mi // 特殊地,若每个点的质量相同,则 // X = ∑xi / n // Y = ∑yi / n //②质量分布均…

思想是分割成三角形,然后求三角形的重心.那么多边形重心就是若干个三角形的重心带权求中心,可以用质点质心公式. #include <cstdio> #include <iostream> #include <algorithm> #include <vector> #include <cstring> #define LL int ; ; LL dp[N]; LL bit[]; using namespace std; struct Point {…

Problem Description There are many secret openings in the floor which are covered by a big heavy stone. When the stone is lifted up, a special mechanism detects this and activates poisoned arrows that are shot near the opening. The only possibility i…

转载请注明出处:http://blog.csdn.net/u012860063 题目链接:pid=1115">http://acm.hdu.edu.cn/showproblem.php? pid=1115 Lifting the Stone Problem Description There are many secret openings in the floor which are covered by a big heavy stone. When the stone is lift…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1115# 大意:给你个n,有n个点,然后给你n个点的坐标,求这n个点形成的多边形的重心的坐标. 直接套模板,我也不知道什么意思.注意在POJ上面定义double时,输出f,如果输出lf则WA,HDU上面输出lf能A. #include <iostream> #include <string.h> #include <stdio.h> #include <algorith…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1115 题意:给出一些点,求这些点围成的多边形的重心: 思路: 方法1:直接分别求所有点的x坐标的平均值和y坐标的平均值,即答案:不过这个方法的计算精度不是很高,要求高精度时用另一个方法: 方法2: 用公式:x = (xi*si*+...xn*sn)/(si+...+sn): y = (yi*si*+...yn*sn)/(si+...+sn): 方法2的代码: #include <iostream>…

Lifting the Stone Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 230 Accepted Submission(s): 130   Problem Description There are many secret openings in the floor which are covered by a big heavy…

Lifting the Stone 题目链接: http://acm.hust.edu.cn/vjudge/contest/130510#problem/G Description There are many secret openings in the floor which are covered by a big heavy stone. When the stone is lifted up, a special mechanism detects this and activates…