문제 출처: https://www.acmicpc.net/problem/11659
문제
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class Main {
public static void main(String[] args) throws IOException {
StringBuilder sb = new StringBuilder();
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer tokenizer = new StringTokenizer(reader.readLine());
int N = Integer.parseInt(tokenizer.nextToken()); // 수의 개수
int M = Integer.parseInt(tokenizer.nextToken()); // 합을 구해야 하는 횟수
tokenizer = new StringTokenizer(reader.readLine());
int[] nums = new int[N + 1];
// 누적 합
for (int i = 0; i < N; i++) {
int temp = Integer.parseInt(tokenizer.nextToken());
nums[i + 1] = nums[i] + temp;
}
for (int x = 0; x < M; x++) {
tokenizer = new StringTokenizer(reader.readLine());
int i = Integer.parseInt(tokenizer.nextToken());
int j = Integer.parseInt(tokenizer.nextToken());
int sum = nums[j] - nums[i - 1];
sb.append(sum).append("\n");
}
System.out.println(sb);
}
}