색종이

package backjoon;
import java.util.*;
public class 연습 {
    public static void main(String[] args) {

        int[][] arr = new int[100][100];

        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j < arr.length; j++) {
                arr[i][j] = 0; // 빈종이로 초기화
            }
        }
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        for (int i = 0; i < a; i++) {
            int x = sc.nextInt();
            int y = sc.nextInt();
            for (int j = x; j < x + 10 ; j++) {
                for (int k = y; k < y + 10; k++) {
                    arr[j][k] = 1; //1 //색종이 덮는 칸 확인

                    }
                }
            }
        int count = 0;
        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j < arr.length; j++) {
                if(arr[i][j]==1){ //덮었다면 count ++
                    count++;
                }
            }
        } System.out.println(count);

    }
}