| Task: | Alitaulukot |
| Sender: | ollpu |
| Submission time: | 2018-01-14 19:06:53 +0200 |
| Language: | C++ |
| Status: | READY |
| Result: | 100 |
| group | verdict | score |
|---|---|---|
| #1 | ACCEPTED | 15 |
| #2 | ACCEPTED | 85 |
| test | verdict | time | group | |
|---|---|---|---|---|
| #1 | ACCEPTED | 0.07 s | 1 | details |
| #2 | ACCEPTED | 0.06 s | 2 | details |
Code
#include <iostream>
using namespace std;
const int M = 1e9+7;
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
int n;
cin >> n;
long s = 0;
for (int i = 0; i < n; ++i) {
long v;
cin >> v;
s += v*(i+1)*(n-i);
s %= M;
}
cout << s << endl;
}