vloai

B. Arpa and an exam about geometrytime limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputArpa is taking a geometr

推公式 角a是突破点。用余弦公式就可以求出a的余弦值了。 1、求s2（较容易） 就是扇形减去两个三角形的面积。用S = 0.5*a*b*sinc就可以求出三角形的面积。扇形面积是 S = 0.5 * a * r * r 。求出s2后就可以用小圆内扇形面积减去s2 ，就得到一半的阴影面积了。#include<iostream>#include<stdio.h>#include<m

Regular polygonTime Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 122    Accepted Submission(s): 45Problem DescriptionOn a two-dime

ZOJ - 4041 - Chasing题意：在 Y 轴左半边有两个人 A，B，他们的位置分别为 (XA,YA), (XB,YB)已知 B 的速度为 A 的 k 倍判断 B 能否在A到达 Y 轴前抓住 A 题解：即判断Y轴上是否存在一点P使得 PB/PA &gt;= k设P为(0, YA+a)则PA = sqrt(XA^2 + a^2) , PB = sqrt(...

 At a geometry lesson Gerald was given a task: to get vector B out of vector A. Besides, the teacher permitted him to perform the following operations with vector А:Turn the vector by 90 degrees c...