BJ 2563色紙

package day0210;

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 ColorPaper {
	static BufferedReader br;
	static BufferedWriter bw;
	static StringTokenizer st;
	static boolean[][] map = new boolean[100][100];
	// 100 * 100 크기의 도화지를 만든 후, 각 종이가 덮을 시 true값으로 바꾸고, 그 개수를 세어서 출력.
	public static void main(String[] args) throws IOException {
		br = new BufferedReader(new InputStreamReader(System.in));
		bw = new BufferedWriter(new OutputStreamWriter(System.out));
		int N = Integer.parseInt(br.readLine());
		for(int i = 0; i < N; i++) {
			st = new StringTokenizer(br.readLine(), " ");
			int x = Integer.parseInt(st.nextToken());
			int y = Integer.parseInt(st.nextToken());
			
			for(int j = x; j < x + 10; j++) {
				for(int k = y; k < y + 10; k++) {
					map[j][k] = true;
				}
			}	
		}
		int count = 0;
		for(int i = 0; i < 100; i++) {
			for(int j = 0; j < 100; j++) {
				if(map[i][j]) count++;
			}
		}
		System.out.println(count);
		
	}
}