Pizzeria

//package pizza;

/**
 *
 * @author Adreno
 */
public class Pizza {

    public static long mod = (long) (Math.pow(10, 9) + 7L);
    public static void main(String[] args) {
        IO io = new IO();
        int n = io.nextInt();
        int[] t = new int[n];
        
        long k = 2;
        for (int i=1; i<n; i++) {
            k *= 2;
            k %= mod;
        }
        
        long summa = 0L;
        for (int i=0; i<n; i++) {
            summa += io.nextInt() * k/2;
            summa %= mod;
        }
        
        io.println(summa);
        io.close();
    }
    
}

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