| Task: | Alitaulukot |
| Sender: | inv41idu53rn4m3 |
| Submission time: | 2018-01-14 20:17:00 +0200 |
| Language: | C++ |
| Status: | READY |
| Result: | 100 |
| group | verdict | score |
|---|---|---|
| #1 | ACCEPTED | 15 |
| #2 | ACCEPTED | 85 |
| test | verdict | time | group | |
|---|---|---|---|---|
| #1 | ACCEPTED | 0.04 s | 1 | details |
| #2 | ACCEPTED | 0.10 s | 2 | details |
Code
#include <iostream>
using namespace std;
int main() {
long n;
cin >> n;
long s = 0;
for (long i = 0; i <= n / 2; i++) {
long x;
cin >> x;
s = (s + x * ((i + 1) * (n - i)) % 1000000007) % 1000000007;
}
for (long i = n / 2 + 1; i < n; i++) {
long x;
cin >> x;
s = (s + x * ((n - i) * (i + 1)) % 1000000007) % 1000000007;
}
cout << s << endl;
}