11441 합 구하기 JAVA

 

쉬운 문제이므로 설명은 생략한다.

 

https://www.acmicpc.net/problem/11441

import java.io.*;
import java.util.StringTokenizer;

public class P11441 {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        int N = Integer.parseInt(br.readLine());
        int[] numArr = new int[N];
        int[] preSum = new int[N+1];

        StringTokenizer st = new StringTokenizer(br.readLine()," ");
        for(int i = 0; i < N; i++) {
            numArr[i] = Integer.parseInt(st.nextToken());
            preSum[i+1] = preSum[i] + numArr[i];
        }

        StringBuilder sb = new StringBuilder();
        int M = Integer.parseInt(br.readLine());
        for(int i = 0; i < M; i++) {
            st = new StringTokenizer(br.readLine()," ");
            int j = Integer.parseInt(st.nextToken());
            int k = Integer.parseInt(st.nextToken());

            sb.append(preSum[k]- preSum[j-1]+"\n");
        }

        System.out.println(sb);
    }
}