题目链接 http://poj.org/problem?id=2187 先求凸包 再求凸多边形直径 旋转卡壳模板题 #include<cstdio> #include<cstring> #include<algorithm> #include<cmath> #include<iostream> #define N 50010 using namespace std; int n,tp,ans; struct P{ int x,y; bool op…

转载请注明出处: http://www.cnblogs.com/fraud/          ——by fraud Beauty Contest Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 31214   Accepted: 9681 Description Bessie, Farmer John's prize cow, has just won first place in a bovine beauty con…

Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 32708   Accepted: 10156 Description Bessie, Farmer John's prize cow, has just won first place in a bovine beauty contest, earning the title 'Miss Cow World'. As a result, Bessie will make a…

旋转卡壳求凸包的直径的平方 板子题 #include<cstdio> #include<vector> #include<cmath> #include<algorithm> using namespace std; struct Point { int x, y; Point(int x=0, int y=0):x(x),y(y) { } }; typedef Point Vector; Vector operator - (const Point&…

题目:http://poj.org/problem?id=2187 学习材料:https://blog.csdn.net/wang_heng199/article/details/74477738 https://www.jianshu.com/p/74c25c0772d6 可以再倒着枚举一遍那样求凸包. 用叉积算面积来旋转卡壳. 注意在面积等于的时候就不要往后走了,不然只有两个点的数据就会死循环. #include<cstdio> #include<cstring> #inclu…

\(\color{#0066ff}{题目描述}\) 贝茜在牛的选美比赛中赢得了冠军"牛世界小姐".因此,贝西会参观N(2 < = N < = 50000)个农场来传播善意.世界将被表示成一个二维平面,每个农场位于一对整数坐标(x,y),各有一个值范围在-10000-10000.没有两个农场共享相同的一对坐标. 尽管贝西沿直线前往下一个农场,但牧场之间的距离可能很大,所以她需要一个手提箱保证在每一段旅程中她有足够吃的食物.她想确定她可能需要旅行的最大可能距离,她要知道她必须带…

题目:http://poj.org/problem?id=2187 学习资料:https://blog.csdn.net/wang_heng199/article/details/74477738 https://www.jianshu.com/p/74c25c0772d6 注意求凸包时先下后上,保持逆时针: 别忘了给点排序囧. 代码如下: #include<cstdio> #include<cstring> #include<algorithm> #include&l…

传送门 旋转卡壳板子题. 就是求凸包上最远点对. 直接上双指针维护旋转卡壳就行了. 注意要时刻更新最大值. 代码: #include<iostream> #include<cstdio> #include<algorithm> #define N 50005 using namespace std; inline int read(){ int ans=0,w=1; char ch=getchar(); while(!isdigit(ch)){if(ch=='-')w=…

http://poj.org/problem?id=2187 显然直径在凸包上(黑书上有证明).(然后这题让我发现我之前好几次凸包的排序都错了QAQ只排序了x轴.....没有排序y轴.. 然后本题数据水,暴力也能过... (之前一直以为距离是单增的,其实并不是,应该是三角形面积单增...) 考虑旋转卡壳 一篇好的文章:http://www.cnblogs.com/Booble/archive/2011/04/03/2004865.html 首先对踵点就是两条平行线夹紧凸包的两个点(或者3个点或4…

链接:http://poj.org/problem?id=2187 Description Bessie, Farmer John's prize cow, has just won first place in a bovine beauty contest, earning the title 'Miss Cow World'. As a result, Bessie will make a tour of N (2 <= N <= 50,000) farms around the wor…