UVA 11346

【题目分析】
积分+期望

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【代码】

#include <cstdio>#include <iostream>#include <cstring>#include <cmath>#include <algorithm>#define eps 1e-6using namespace std;int main(){    int tt;    double a,b,s;    scanf("%d",&tt);    while (tt--)    {        scanf("%lf%lf%lf",&a,&b,&s);        if (s>=a*b) printf("0.000000%%\n");        else if (fabs(s)<=eps) printf("100.000000%%\n");        else printf("%.6lf%%\n",100*((a*b-s-s*log(a*b/s))/(a*b)));    }}