题意   裸的计算几何  求多边形重心: #include<iostream> #include<stdio.h> #include<cstring> #include<algorithm> #include<cmath> using namespace std; double a,b,c,d,e,f; double mix( double x,double y,double xx,double yy ){return x*yy - xx*y;}…

Lifting the Stone Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 1115 Description There are many secret openings in the floor which are covered by a big heavy stone. When the stone is lifted up…

Lifting the Stone Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 6104    Accepted Submission(s): 2546 Problem Description There are many secret openings in the floor which are covered by a big…

题目: Lifting the Stone Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 168 Accepted Submission(s): 98   Problem Description There are many secret openings in the floor which are covered by a big he…

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 Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) 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 mecha…

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…

Lifting the Stone Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 4819    Accepted Submission(s): 2006 Problem Description There are many secret openings in the floor which are covered by a big…

Lifting the Stone Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 5203    Accepted Submission(s): 2155 Problem Description There are many secret openings in the floor which are covered by a big…

Lifting the Stone Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Practice HDU 1115 Description There are many secret openings in the floor which are covered by a big heavy stone. When the stone is lifted up, a spe…

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…

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…

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…

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 is to lift the stone…

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…

题目链接:hdu 1115 计算几何求多边形的重心,弄清算法后就是裸题了,这儿有篇博客写得很不错的: 计算几何-多边形的重心 代码如下: #include<cstdio> #include<cstring> #include<algorithm> #include<cmath> using namespace std; ; struct point { double x,y; point() {} point(double x, double y): x(x…

题目链接:http://poj.org/problem?id=1385 题目大意:给你一个多边形的点,求重心. 首先,三角形的重心: ( (x1+x2+x3)/3 , (y1+y2+y3)/3 ) 然后多边形的重心就是将多边形划分成很多个三角形,以三角形面积为权值,将每个三角形的重心加权平均. 注意: pair<double,double>会MLE.. fabs会损失精度?(这个我也不知道),因此在用向量叉积求三角形面积的时候最好是直接让面积求出来就是正的..否则fabs就WA了... 代码:…

我们需要把一块石头平稳的从地板上拿起来.石头的底面是多边形且各个部分的高度都一样,我们需要找出石头的重心. input 测试案例  T; 每组第一行给出N,表示定点数. 接下来N行,每行连个数,表示坐标.定点按顺时针或逆时针给出. output 重心坐标.两个数中间一个空格,每个数保留两位小数. 思路 把多变形分成N-2个三角形,求出重心,重心的质量.(其实是质心) 根据   x=Σ(xi*mi)/Σmi,有因为mi 正比于体积 正比于 面积. 所以利用叉乘求面积. #include"iostr…

一.质点系重心公式 x=(x1*m1+x2*m2+x3*m3.....xn*mn)/M  (M=m1+m2+m3+m4...+mn) 二.三角形重心 可直接求得,但在多边形剖分中 各三角形的质点的质量大小不一样 质量大小等于三角形面积. 三.多边形重心 三角形剖分+任意点的三角形剖分+三角形重心+质点系重心公式+任意点的三角形剖分 所以很容易知道一种很优美的计算公式(看代码) #include <cstdio> #include <cstdlib> #include <cma…

POJ1385 给定n个顶点 顺序连成多边形 求重心 n<=1e+6 比较裸的重心问题 没有特别数据 由于答案保留两位小数四舍五入 需要+0.0005消除误差 #include<iostream> #include<stdio.h> #include<stdlib.h> #include<string.h> #include<math.h> #include<algorithm> #include<queue> #i…

各种杂题,水题,模拟,包括简单数论. 1001 A+B 1002 A+B+C 1009 Fat Cat 1010 The Angle 1011 Unix ls 1012 Decoding Task 1019 Grandpa's Other Estate 1034 Simple Arithmetics 1036 Complete the sequence! 1043 Maya Calendar 1054 Game Prediction 1057 Mileage Bank 1067 Rails 10…

改革春风吹满地 Time Limit: / MS (Java/Others) Memory Limit: / K (Java/Others) Total Submission(s): Accepted Submission(s): Problem Description “ 改革春风吹满地, 不会AC没关系; 实在不行回老家, 还有一亩三分地. 谢谢!(乐队奏乐)” 话说部分学生心态极好,每天就知道游戏,这次考试如此简单的题目,也是云里雾里,而且,还竟然来这么几句打油诗. 好呀,老师的责任就是帮…

Lifting the Stone Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 7674    Accepted Submission(s): 3252 Problem Description There are many secret openings in the floor which are covered by a big…

Lifting the Stone http://acm.hdu.edu.cn/showproblem.php?pid=1115 题目描述:输入n个顶点(整数),求它们围成的多边形的重心. 算法:以一个点出发,与其他非邻点相连,将n边形划分成n-2个三角形.求每个三角形的质点系重心(如:((x1+x2+x3)/3,(y1+y2+y3)/3)),再求出每个三角形的面积.相乘求和后除以多边形面积). 注意:we connect the points in the given order.输入的顺序,…

HDU 1000 A + B Problem  I/O HDU 1001 Sum Problem  数学 HDU 1002 A + B Problem II  高精度加法 HDU 1003 Maxsum  贪心 HDU 1004 Let the Balloon Rise  字典树,map HDU 1005 Number Sequence  求数列循环节 HDU 1007 Quoit Design  最近点对 HDU 1008 Elevator  模拟 HDU 1010 Tempter of th…

Lifting the Stone Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 6971    Accepted Submission(s): 2919 Problem Description There are many secret openings in the floor which are covered by a big…

ZOJ题目分类初学者题: 1001 1037 1048 1049 1051 1067 1115 1151 1201 1205 1216 1240 1241 1242 1251 1292 1331 1334 1337 1338 1350 1365 1382 1383 1394 1402 1405 1414 1494 1514 1622 1715 1730 1755 1760 1763 1796 1813 1879 1889 1904 1915 1949 2001 2022 2099 2104 21…

POJ 2235 Frogger / UVA 534 Frogger /ZOJ 1942 Frogger(图论,最短路径) Description Freddy Frog is sitting on a stone in the middle of a lake. Suddenly he notices Fiona Frog who is sitting on another stone. He plans to visit her, but since the water is dirty a…

第十三届浙江省大学生程序设计竞赛 I 题, 一道模拟题. ZOJ  3944http://www.icpc.moe/onlinejudge/showProblem.do?problemCode=3944 In a BG (dinner gathering) for ZJU ICPC team, the coaches wanted to count the number of people present at the BG. They did that by having the waitre…

A Simple Tree Problem Time Limit: 3 Seconds      Memory Limit: 65536 KB Given a rooted tree, each node has a boolean (0 or 1) labeled on it. Initially, all the labels are 0. We define this kind of operation: given a subtree, negate all its labels. An…