문제(출처: https://www.acmicpc.net/problem/9780) 문제 풀이 누적합을 사용한다. my solution (Java)import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.util.StringTokenizer;public class _9780_ { // Range Sum Query public static void main(String[] args) throws IOException { BufferedReader bf = new Buf..