physics Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 817    Accepted Submission(s): 454 Problem Description There are n balls on a smooth horizontal straight track. The track can be considere…

physics 题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5826 Description There are n balls on a smooth horizontal straight track. The track can be considered to be a number line. The balls can be considered to be particles with the same mass. At the…

 physics(物理) Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)   Description 题目描述 There are n balls on a smooth horizontal straight track. The track can be considered to be a number line. The balls can be considered…

physics 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5826 Description There are n balls on a smooth horizontal straight track. The track can be considered to be a number line. The balls can be considered to be particles with the same mass. At the…

该问题和xi,di均无关,碰撞只会使得速度反向,大小不会变.因此只要计算速度. #pragma comment(linker, "/STACK:1024000000,1024000000") #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> #include<vector> #include<map> #include<…

/* hdu 1724 Ellipse simpson积分 求椭圆的部分面积 simpson积分法 http://zh.wikipedia.org/zh-tw/%E8%BE%9B%E6%99%AE%E6%A3%AE%E7%A7%AF%E5%88%86%E6%B3%95 */ #include<stdio.h> #include<math.h> const double eps=1e-8; inline double jue(double a) { return a>0?a:-…

题目:这里 题意:光滑的水平直线上有n个质量相等的小球,已知每个小球的初始位置,初始速度和方向,每个小球的每个时刻的加速度a都满足a*v=c,v是该时刻的速度,c是已知的 常数,小球之间的碰撞是完全碰撞(不明白就百度),然后q个询问,每次询问第t秒时速度第k小的小球速度是多少? 完全碰撞即碰撞后速度交换,速度还是那两个速度,只是不是原来那个球了而已,但这并不时需要考虑的,因为只需要关心速度,所以初始方向以及初始位置什么的都不需要在意, 因为加速度a=c/v,加速度每时每刻都在变,速度每时每刻也在…

题目:http://acm.hdu.edu.cn/showproblem.php?pid=1724 #include<cstdio> #include<cstring> #include<algorithm> #include<cmath> #define db double using namespace std; ; int T;db a,b,l,r; db f(db x){-x*x/a)*b);} db cal(db l,db r){*f((l+r)/…

[题目分析] 一看题目,直接把椭圆积分起来就可以了嘛. 然后发现椭圆比较难积分,还是算了吧. 用Simpson积分硬上. 大概就是用二次函数去拟合面积. [代码] #include <cstdio> #include <cstring> #include <cmath> #include <cstdlib> #include <map> #include <set> #include <queue> #include &l…

Ellipse Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1868    Accepted Submission(s): 792 Problem Description Math is important!! Many students failed in 2+2’s mathematical test, so let's AC t…