[백준][Java] 11441번 합 구하기 (누적합)

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
 
 
public class Main {
        
    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    private static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
    
    
    public static void main(String[] args) throws IOException{
        int N = Integer.parseInt(br.readLine());
        int[] num = new int[N+1];
        int[] accum = new int[N+1];
        
        String[] str = br.readLine().split(" ");
        for(int i=1; i<=N; i++) {
            num[i] = Integer.parseInt(str[i-1]);
            accum[i] = accum[i-1] + num[i];
        }
        
        int M = Integer.parseInt(br.readLine());
        
        for(int i=1; i<=M; i++) {
            str = br.readLine().split(" ");
            System.out.println(accum[Integer.parseInt(str[1])] - accum[Integer.parseInt(str[0])-1]);
        }
        
        
//        bw.write("");
//        bw.flush(); 
//        bw.close();
    }
}