Main.java

package DP.P11659;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {

    static int N, M;
    static int[] nums;

    public static void main(String[] args) throws Exception {
        System.setIn(new FileInputStream("src/DP/P11659/input.txt"));
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());

        N = Integer.parseInt(st.nextToken());
        M = Integer.parseInt(st.nextToken());

        nums = new int[N];
        st = new StringTokenizer(br.readLine());
        for (int i = 0; i < N; i++) {
            int value = Integer.parseInt(st.nextToken());
            if (i == 0) nums[i] = value;
            else nums[i] = value + nums[i-1];
        }

        for (int i = 0; i < M; i++) {
            st = new StringTokenizer(br.readLine());
            int from = Integer.parseInt(st.nextToken()) - 1;
            int to = Integer.parseInt(st.nextToken()) - 1;

            if (from > 0) System.out.println(nums[to] - nums[from - 1]);
            else System.out.println(nums[to]);
        }
    }
}