编程介的小学生
2019-01-02 17:41
采纳率: 92.5%
浏览 275

一个有关机器人的概率问题,用数据结构的方式怎么解决,求问各位坛友

Problem Description
Michael has a telecontrol robot. One day he put the robot on a loop with n cells. The cells are numbered from 1 to n clockwise.

At first the robot is in cell 1. Then Michael uses a remote control to send m commands to the robot. A command will make the robot walk some distance. Unfortunately the direction part on the remote control is broken, so for every command the robot will chose a direction(clockwise or anticlockwise) randomly with equal possibility, and then walk w cells forward.
Michael wants to know the possibility of the robot stopping in the cell that cell number >= l and <= r after m commands.

Input
There are multiple test cases.
Each test case contains several lines.
The first line contains four integers: above mentioned n(1≤n≤200) ,m(0≤m≤1,000,000),l,r(1≤l≤r≤n).
Then m lines follow, each representing a command. A command is a integer w(1≤w≤100) representing the cell length the robot will walk for this command.

The input end with n=0,m=0,l=0,r=0. You should not process this test case.

Output
For each test case in the input, you should output a line with the expected possibility. Output should be round to 4 digits after decimal points.

Sample Input
3 1 1 2
1
5 2 4 4
1
2
0 0 0 0

Sample Output
0.5000
0.2500

  • 写回答
  • 好问题 提建议
  • 追加酬金
  • 关注问题
  • 收藏
  • 邀请回答

1条回答 默认 最新

  • threenewbee 2019-10-04 08:07
    已采纳
    评论
    解决 无用
    打赏 举报

相关推荐 更多相似问题