hdu 5035 指数概率分布+积分

代码很好写,下面有我自己写的代码,上面的解析实在太详细,比我自己证的好看的多,就借用一下了,

解析转载处

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#define MAX 1007

using namespace std;

int t,n;
double k[MAX];

int main ( )
{
    scanf ( "%d" , &t );
    int c = 1;
    while ( t-- )
    {
        scanf ( "%d" , &n );
        double sum = 0.0;
        for ( int i = 1 ; i <= n ; i++ ) 
            scanf ( "%lf" , &k[i] ) , sum += k[i];
        for ( int i = 1 ; i <= n ; i++ )
            scanf ( "%lf" , &k[i] );
        printf ( "Case #%d: %.6f\n" , c++ , (n+1)/sum ); 
    }
}