Alitaulukot

#include <iostream>

using namespace std;
int n;
typedef long long ll;
int p[100001];
int s[100001];

int main(int argc, char** argv) {
	ios_base::sync_with_stdio(0); cin.tie(0);
	cin >> n; cin.ignore();
	
	cin >> s[0];
	for (int i = 1; i < n; i++) {
		int e; cin >> e;
		s[i] = e;
	}
	
	p[0] = s[0];
	ll r = (ll)p[0];
	for (int i = 1; i < n; i++) {
		p[i] += p[i - 1];
		int t = (i + 1) * s[i];
		p[i] += t;
		r += (ll)p[i]; r %= 1000000007LL;
	}
	
	cout << r;
	
	return 0;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: WRONG ANSWER