[백준/자바] 11660 - 구간 합 구하기 5

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 {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());

        int n = Integer.parseInt(st.nextToken());
        int q = Integer.parseInt(st.nextToken());

        int[][] arr = new int[n+1][n+1];
        for(int i=1; i<=n; i++) {
            st = new StringTokenizer(br.readLine());
            for(int j=1; j<=n; j++) {
                arr[i][j] = Integer.parseInt(st.nextToken());
            }
        }

        int[][] sum = new int[n+1][n+1];
        for(int i=1; i<=n; i++) {
            for(int j=1; j<=n; j++) {
                sum[i][j] = sum[i-1][j] + sum[i][j-1] - sum[i-1][j-1] + arr[i][j];
            }
        }

        for(int i=0; i<q; i++) {
            st = new StringTokenizer(br.readLine());
            int x1 = Integer.parseInt(st.nextToken());
            int y1 = Integer.parseInt(st.nextToken());
            int x2 = Integer.parseInt(st.nextToken());
            int y2 = Integer.parseInt(st.nextToken());

            int result = sum[x2][y2] - sum[x1-1][y2] - sum[x2][y1-1] + sum[x1-1][y1-1];
            System.out.println(result);
        }

        br.close();
    }
}