6354.Everything Has Changed 就是计算圆弧的周长,总周长=大圆周长+相交(相切)部分的小圆的弧长-覆盖掉的大圆的弧长. 相交部分小圆的弧长直接求出来对应的角就可以,余弦公式,然后反余弦得到角,由弧长公式=βr就可以了,大圆的就求大圆弧长对应的角就可以了. cosα=(/Oo/^2+r^2-R^2)/2*/Oo/*r /Oo/为两圆心角的距离. 贴一下队友博客,懒得写了... 6354计算几何 就这样,溜了.…

题意:源点处有个圆,然后给你m个圆(保证互不相交.内含),如果源点圆和这些原相交了,就剪掉相交的部分,问你最后周长(最外面那部分的长度). 思路:分类讨论,只有内切和相交会变化周长,然后乱搞就行了.题目好像不用讨论给的圆包含源点圆的情况(0?),那么只剩内含(不变).相切(增加小圆周长).相离(不变).相交(余弦定理求一下).余弦定理都快忘了,本来打算构建rt三角形233.学到一招pi = acos(-1.0). 代码: #include<cstdio> #include<set>…

Problem Description Edward is a worker for Aluminum Cyclic Machinery. His work is operating mechanical arms to cut out designed models. Here is a brief introduction of his work.Assume the operating plane as a two-dimensional coordinate system. At fir…

Beautiful Now Time Limit: 5000/2500 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 1876    Accepted Submission(s): 707 Problem Description Anton has a positive integer n, however, it quite looks like a mess, so he…

Saving HDU Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 7194    Accepted Submission(s): 3345 Problem Description 话说上回讲到海东集团面临内外交困,公司的元老也只剩下XHD夫妇二人了.显然,作为多年拼搏的商人,XHD不会坐以待毙的.  一天,当他正在苦思冥想解困良策的…

http://acm.hdu.edu.cn/showproblem.php?pid=3037 Lucas定理模板. 现在才写,noip滚粗前兆QAQ #include<cstdio> #include<cstring> #include<algorithm> using namespace std; typedef long long ll; int jc[100003]; int p; int ipow(int x, int b) { ll t = 1, w = x;…

http://acm.hdu.edu.cn/showproblem.php?pid=4859 题目大意: 在一个矩形周围都是海,这个矩形中有陆地,深海和浅海.浅海是可以填成陆地的. 求最多有多少条方格线满足两侧分别是海洋和陆地 这道题很神 首先考虑一下,什么情况下能够对答案做出贡献 就是相邻的两块不一样的时候 这样我们可以建立最小割模型,可是都说是最小割了 无法求出最大的不相同的东西 所以我们考虑转化,用总的配对数目 - 最小的相同的对数 至于最小的相同的对数怎么算呢? 我们考虑这样的构造方法:…

Special equations Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 4569 Description Let f(x) = a nx n +...+ a 1x +a 0, in which a i (0 <= i <= n) are all known integers. We call f(x) 0 (mod…

The kth great number Time Limit:1000MS     Memory Limit:65768KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 4006 Description Xiao Ming and Xiao Bao are playing a simple Numbers game. In a round Xiao Ming can choose to write down a nu…

How many integers can you find Time Limit:5000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 1796 Description   Now you get a number N, and a M-integers set, you should find out how many integers which are sm…