Pizzeria

#include <bits/stdc++.h>
using namespace std;
#define M 1000000007
long pot(long a, long b)
{
	if (b == 0) return 1;
	if (b & 1) return (a * pot(a, b - 1)) % M;
	long z = pot(a, b / 2);
	return (z * z) % M;
}
int main()
{
	int n;
	cin >> n;
	long r = 0;
	long z = pot(2, n - 1);
	for (int i = 0; i < n; ++i) {
		long x;
		cin >> x;
		r += (z * x) % M;
		r %= M;
	}
	cout << r << "\n";
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED