#BZOJ4001. 概率论
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ID: 2569
Type: RemoteJudge
1000ms
256MiB
Tried: 0
Accepted: 0
Difficulty: (None)
Uploaded By:
root
概率论
No submission language available for this problem.
题目描述
输入格式
输入一个正整数N，代表有根树的结点数
输出格式
输出这棵树期望的叶子节点数。要求误差小于1e-9
1
1.000000000
数据范围与约定
1<=N<=10^9