| Task: | Alitaulukot |
| Sender: | Olli |
| Submission time: | 2018-01-14 19:09:08 +0200 |
| Language: | C++ |
| Status: | READY |
| Result: | 100 |
| group | verdict | score |
|---|---|---|
| #1 | ACCEPTED | 15 |
| #2 | ACCEPTED | 85 |
| test | verdict | time | group | |
|---|---|---|---|---|
| #1 | ACCEPTED | 0.05 s | 1 | details |
| #2 | ACCEPTED | 0.10 s | 2 | details |
Code
#include <iostream>
using namespace std;
typedef long long ll;
const int M = 1e9 + 7;
int main() {
int n;
cin >> n;
ll sum = 0;
for(int i = 0; i < n; ++i) {
ll a;
cin >> a;
sum += ((ll) (i + 1)*(n - i)*a)%M;
sum %= M;
}
cout << sum << "\n";
}