题意:圆心在原点,一个坐标(x,y)在圆上,通过这个点画一个三角形在圆内,三角形其顶点都在圆上,要求三角形的周长最大,输出满足这样条件的三角形的另两个坐标..... 思路:有一个公式是把一个向量平移多少角度的......a向量=(x,y),要将a向量旋转120度 x1=x*cos(120.0/180.0*PI)-y*sin(120.0/180.0*PI);y1=y*cos(120.0/180.0*PI)+x*sin(120.0/180.0*PI); 平移过后就变成了(x1,y1)...... 公…

Wall Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 28157   Accepted: 9401 Description Once upon a time there was a greedy King who ordered his chief Architect to build a wall around the King's castle. The King was so greedy, that he wo…

Problem A. AerodynamicsTime Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=86821#problem/A Description Bill is working in a secret laboratory. He is developing missiles for national security projects. Bi…

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 {…

题面 题意:给出小于10个点形成的凸多边形 和一个半径为r 可以移动的圆 求圆心在何处的面积交最大,面积为多少 题解:三分套三分求出圆心位置,再用圆与多边形面积求交 #include<bits/stdc++.h> #define inf 1000000000000 #define M 100009 #define eps 1e-12 #define PI acos(-1.0) using namespace std; struct node { double x,y; node(){} nod…

题目链接:https://cn.vjudge.net/problem/POJ-3348 题意 啊模版题啊 求凸包的面积,除50即可 思路 求凸包的面积,除50即可 提交过程 AC 代码 #include <cmath> #include <cstdio> #include <vector> #include <algorithm> using namespace std; const double eps=1e-10; struct Point{ doubl…

题目链接:https://cn.vjudge.net/problem/POJ-1113 题意 给一些点,求一个能够包围所有点且每个点到边界的距离不下于L的周长最小图形的周长 思路 求得凸包的周长,再加上一个半径为L的圆的周长 提交过程 CE 注意某些OJ上cmath库里没有M_PI AC 代码 #define PI 3.1415926 #include <cmath> #include <cstdio> #include <vector> #include <al…

链接:https://www.nowcoder.com/acm/contest/141/J来源:牛客网 Eddy has graduated from college. Currently, he is finding his future job and a place to live. Since Eddy is currently living in Tien-long country, he wants to choose a place inside Tien-long country…

Time Limit: 1000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 930    Accepted Submission(s): 200 Problem Description Can you believe it? After Gardon had solved the problem, Angel accepted him! They were sitt…

D - Blast the Enemy! Time Limit:3000MS     Memory Limit:0KB     64bit IO Format:%lld & %llu Submit Status Practice UVALive 4426 Description A new computer game has just arrived and as an active and always-in-the-scene player, you should finish it bef…