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-6 using 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))); } }