#include <stdio.h>
int main()
{
double sum=0.0,a[100001]={0};
long int reserve=0,n,i=1;
scanf("%ld",&n);
reserve = n;
while(i<=n)
{
scanf("%lf",&a[i]);
i++;
}
i=1;
while(i<=reserve)
{
sum += i*n*a[i];
i++;
n--;
}
printf("%.2f",sum);
//system("pause");
return 0;
}
Les fragments de 1049 et le nombre de colonnes, C
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Origine blog.csdn.net/weixin_43916400/article/details/104615826
conseillé
Classement