Uva--10491(数学,概率)

2014-09-03 15:21:58

找规律。不说啥了。

 1 /*************************************************************************
 2     > File Name: Uva10491.cpp
 3     > Author: Nature
 4     > Mail: 564374850@qq.com 
 5     > Created Time: Wed 03 Sep 2014 02:43:48 PM CST
 6 ************************************************************************/
 7 
 8 #include <cstdio>
 9 #include <cstring>
10 #include <cstdlib>
11 #include <cmath>
12 #include <iostream>
13 #include <algorithm>
14 using namespace std;
15 const double eps = 1e-9;
16 
17 int main(){
18     double a,b,c,t,tmp;
19     while(scanf("%lf%lf%lf",&a,&b,&c) != EOF){
20         tmp = a+b-c-1;
21         if(fabs(tmp) < eps) t = 1.0;
22         else t = a*b/tmp/(a+b);
23         printf("%.5lf\n",t + b*(b-1)/tmp/(a+b));
24     }
25     return 0;
26 }

 

posted @ 2014-09-03 15:22  Naturain  阅读(120)  评论(0编辑  收藏  举报