Envío 1740

Código

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.Arrays;

/**
 *
 * @author Julian_Miranda
 */
public class Main {

    static BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
    static BufferedWriter br = new BufferedWriter(new OutputStreamWriter(System.out));

    public static void main(String[] args) throws IOException {
        long n = Long.parseLong(bf.readLine());
        long[] arreglo = Arrays.stream(bf.readLine().split(" ")).mapToLong(x -> Long.parseLong(x)).toArray();
        long m = Long.parseLong(bf.readLine());
        for (int i = 0; i < m; i++) {
            long[] cases = Arrays.stream(bf.readLine().split(" ")).mapToLong(x -> Long.parseLong(x)).toArray();
            find(arreglo, cases);
        }
    }

    public static void find(long[] arreglo, long[] cases) throws IOException {
        if (cases[0] == cases[1]) {
            br.write(String.valueOf(arreglo[(int) cases[0]]));
        } else {
            long sum = 0;
            for (int j = (int) cases[0]; j <= cases[1]; j++) {
                sum += arreglo[j];
            }
            br.write(String.valueOf(sum));
        }
    }
}