扫地机器人清扫过的空间个数

/*
 * 题目思路：
 * 1. 使用Java Stream处理数据，模拟机器人移动并记录清扫的空间。
 * 2. 使用集合存储清扫过的空间，使用流操作来处理和过滤数据。
 */
import java.util.HashSet;
import java.util.Set;
import java.util.stream.IntStream;

public class Solution {
    public int cleanedSpaces(int[][] room, int[] start) {
        Set<String> visited = new HashSet<>();
        int[][] directions = {{-1, 0}, {1, 0}, {0, -1}, {0, 1}};
        int[] position = {start[0], start[1]};
        int[] dirIndex = {0};
        visited.add(position[0] + "," + position[1]);

        IntStream.range(0, room.length * room[0].length).forEach(i -> {
            int newX = position[0] + directions[dirIndex[0]][0];
            int newY = position[1] + directions[dirIndex[0]][1];
            if (newX >= 0 && newX < room.length && newY >= 0 && newY < room[0].length && room[newX][newY] != 1 && !visited.contains(newX + "," + newY)) {
                position[0] = newX;
                position[1] = newY;
                visited.add(position[0] + "," + position[1]);
            } else {
                dirIndex[0] = (dirIndex[0] + 1) % 4;
            }
        });

        return visited.size();
    }
}