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 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…

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…

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<…

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…

HDU 5572 An Easy Physics Problem (计算几何) 题目链接http://acm.hdu.edu.cn/showproblem.php?pid=5572 Description On an infinite smooth table, there's a big round fixed cylinder and a little ball whose volume can be ignored. Currently the ball stands still at p…

2015上海区域赛现场赛第5题. 题目连接:http://acm.hdu.edu.cn/showproblem.php?pid=5572 题意:在平面上,已知圆(O, R),点B.A(均在圆外),向量V. 一个小球从A出发,沿速度向量V匀速前进,若撞到圆则发生弹性碰撞,沿“反射方向”继续匀速前进.问A点能否经过B点. 题目读懂了,把所有情况都考虑全,流程图就出来了,然后直接套模版即可(注意有些功能可剪裁~) 我的第一道计算几何,WA了一个星期啊...原因有姿势不对,精度不对,还有输出不对的. 不…

An Easy Physics Problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 3845    Accepted Submission(s): 768 Problem Description On an infinite smooth table, there's a big round fixed cylinder an…

An Easy Physics Problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1430    Accepted Submission(s): 270 Problem Description On an infinite smooth table, there's a big round fixed cylinder an…