标签：div cti nbsp color its log proc img pre
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#include <bits/stdc++.h>typedef long long LL;using namespace std;int main() { int n; double a[100010]; double sum = 0; cin >> n; for(int i = 0; i < n; i++) scanf("%lf",&a[i]); for(int i = 0; i < n; i++) sum += a[i] * (n - i) * (i + 1); printf("%.2f\n",sum);} |
标签：div cti nbsp color its log proc img pre
原文地址：http://www.cnblogs.com/zhwong/p/6493243.html
