1104. Sum of Number Segments (20)

题目：https://www.patest.cn/contests/pat-a-practise/1104

代码：

#include<cstdio>#include<cstring>#include<cstdlib>#include<algorithm>using namespace std;int main(){    int n;double sum=0.0,temp;scanf("%d",&n);for(int i=1;i<=n;i++){   scanf("%lf",&temp);   sum+=temp*i*(n+1-i);}printf("%.2lf\n",sum);system("pause");}