编程介的小学生 2020-01-16 11:49 采纳率: 20.5%
浏览 87

Randomization? 随机数的问题

Problem Description
Random is the real life. What we see and sense everyday are absolutely randomly happened. Randomization is the process of making something random, as the nature.
Given a tree with N nodes, to be more precisely, a tree is a graph in which each pair of nodes has and only has one path. All of the edges’ length is a random integer lies in interval [0, L] with equal probability. iSea want to know the probability to form a tree, whose edges’ length are randomly generated in the given interval, and in which the path's length of every two nodes does not exceed S.

Input
The first line contains a single integer T, indicating the number of test cases.
Each test case includes three integers N, L, S. Then N - 1 lines following, each line contains two integers Ai and Bi, describing an edge of the tree.

Technical Specification
1. 1 <= T <= 512
2. 1 <= N <= 64
3. 1 <= L <= 8, 1 <= S <= 512
4. 1 <= Ai, Bi <= N

Output
For each test case, output the case number first, then the probability rounded to six fractional digits.

Sample Input
3
2 3 2
1 2
4 3 4
1 2
2 3
3 4
7 4 10
1 2
2 3
4 5
2 6
4 7
4 6

Sample Output
Case 1: 0.750000
Case 2: 0.500000
Case 3: 0.624832

  • 写回答

0条回答 默认 最新

    报告相同问题?

    悬赏问题

    • ¥15 seatunnel-web使用SQL组件时候后台报错,无法找到表格
    • ¥15 fpga自动售货机数码管(相关搜索:数字时钟)
    • ¥15 用前端向数据库插入数据,通过debug发现数据能走到后端,但是放行之后就会提示错误
    • ¥30 3天&7天&&15天&销量如何统计同一行
    • ¥30 帮我写一段可以读取LD2450数据并计算距离的Arduino代码
    • ¥15 C#调用python代码(python带有库)
    • ¥15 飞机曲面部件如机翼,壁板等具体的孔位模型
    • ¥15 vs2019中数据导出问题
    • ¥20 云服务Linux系统TCP-MSS值修改?
    • ¥20 关于#单片机#的问题:项目:使用模拟iic与ov2640通讯环境:F407问题:读取的ID号总是0xff,自己调了调发现在读从机数据时,SDA线上并未有信号变化(语言-c语言)