백준 1358번

원본 : https://www.acmicpc.net/problem/1358

1358번: 하키

 

풀이

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
    private static final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
    private static final StringBuilder stringBuilder = new StringBuilder();

    public static void main(String[] args) throws Exception {
        StringTokenizer stringTokenizer = new StringTokenizer(bufferedReader.readLine());
        int w = Integer.parseInt(stringTokenizer.nextToken());
        int h = Integer.parseInt(stringTokenizer.nextToken());
        int x = Integer.parseInt(stringTokenizer.nextToken());
        int y = Integer.parseInt(stringTokenizer.nextToken());
        int p = Integer.parseInt(stringTokenizer.nextToken());
        int count = 0;

        for (int i = 0; i < p; i++) {
            stringTokenizer = new StringTokenizer(bufferedReader.readLine());
            int personX = Integer.parseInt(stringTokenizer.nextToken());
            int personY = Integer.parseInt(stringTokenizer.nextToken());

            double powY = Math.pow((y + h / 2.0) - personY, 2);

            if (personX >= x && personX <= x + w && personY >= y && personY <= y + h) {
                count++;
            } else if (Math.sqrt(Math.pow(x - personX, 2) + powY) <= (h / 2.0)) {
                count++;
            } else if (Math.sqrt(Math.pow(x + w - personX, 2) + powY) <= (h / 2.0)) {
                count++;
            }
        }

        System.out.println(stringBuilder.append(count));
    }
}