Matt is a big fan of logo design. Recently he falls in love with logo made up by rings. The following figures are some famous examples you may know. A ring is a 2-D figure bounded by two circles sharing the common center. The radius for these circles…

题中给了 两个同心圆, 一个大圆一个小圆,然后再给了一个大圆一个小圆也是同心圆,求这两个圆环相交的面积,用两个大圆面积减去两倍大小圆面积交加上两个小圆面积交,就ok了 这里算是坑明白了 使用acos的时候要保证不能让大于1或者小于-1的数进来,因此加一个判断,在现场的时候就是这里被坑死了 #include <iostream> #include <cstdio> #include <algorithm> #include <cmath> #include &…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5120 解题报告:给你两个完全相同的圆环,要你求这两个圆环相交的部分面积是多少? 题意看了好久没懂.圆环由一个大圆里面套一个小圆,中间部分就是圆环,两圆环相交面积 = 大圆相交的面积 - 2*大圆与小圆相交的面积 + 小圆与小圆相交的面积. 也就是说,这题就可以化为求两个圆的相交的面积了.可以利用两个圆的方程,求出圆的交点所在的直线,然后求出圆心到这条直线的距离,就可以求出两个圆对应的扇形的圆心角是多…

Problem Description Matt is a big fan of logo design. Recently he falls in love with logo made up by rings. The following figures are some famous examples you may know. A ring is a 2-D figure bounded by two circles sharing the common center. The radi…

Intersection Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5120 Description Matt is a big fan of logo design. Recently he falls in love with logo made up by rings. The following figures are some famous examples…

两个圆环的内外径相同 给出内外径 和 两个圆心 求两个圆环相交的面积 画下图可以知道 就是两个大圆交-2*小圆与大圆交+2小圆交 Sample Input22 30 00 02 30 05 0 Sample OutputCase #1: 15.707963Case #2: 2.250778 # include <iostream> # include <cstdio> # include <cstring> # include <algorithm> # i…

Intersection Time Limit: 4000/4000 MS (Java/Others)    Memory Limit: 512000/512000 K (Java/Others) Problem Description Matt is a big fan of logo design. Recently he falls in love with logo made up by rings. The following figures are some famous examp…

题意:告诉你两个圆环,求圆环相交的面积. /* gyt Live up to every day */ #include<cstdio> #include<cmath> #include<iostream> #include<algorithm> #include<vector> #include<stack> #include<cstring> #include<queue> #include<set&…

题意:给定两个圆环,求两个圆环的面积交. 析:很容易知道,圆环面积交就是,大圆与大圆面积交 - 大圆和小圆面积交 - 小圆和大圆面积交 + 小圆和小圆面积交. 代码如下: #pragma comment(linker, "/STACK:1024000000,1024000000") #include <cstdio> #include <string> #include <cstdlib> #include <cmath> #includ…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5120 A ring is a 2-D figure bounded by two circles sharing the common center. The radius for these circles are denoted by r and R (r < R). For more details, refer to the gray part in the illustration bel…