문제 출처: https://www.acmicpc.net/problem/2563
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 {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int[][] whiteBoard = new int[100][100];
int numOfPaper = Integer.parseInt(reader.readLine());
int result = 0;
while (numOfPaper-- > 0) {
StringTokenizer tokenizer = new StringTokenizer(reader.readLine());
int col = Integer.parseInt(tokenizer.nextToken());
int row = Integer.parseInt(tokenizer.nextToken());
for (int i = row; i < row + 10; i++) {
for (int j = col; j < col + 10; j++) {
whiteBoard[i][j] = 1;
}
}
}
for (int i = 0; i < 100; i++) {
for (int j = 0; j < 100; j++) {
if (whiteBoard[i][j] == 1) result++;
}
}
System.out.println(result);
}
}