CCFCSP试题编号：201912-2试题名称：回收站选址

这题只要比较坐标的四周，然后计数就可以了。

#include 
using namespace std;

int main()
{
	int n;
	cin >> n;
	int arr[1005][2] = { 0 };
	int res[5] = { 0 };
	int up = 0;
	int down = 0;
	int left = 0;
	int right = 0;
	int score = 0;
	for (int i = 0; i < n; i++)
	{
		cin >> arr[i][0] >> arr[i][1];
	}
	for (int i = 0; i < n; i++)
	{
		int x = arr[i][0];
		int y = arr[i][1];
		 up = 0;
		 down = 0;
		 left = 0;
		 right = 0;
		for (int j = 0; j < n; j++)
		{
			if (x == arr[j][0] && y == arr[j][1] - 1)
			{
				up++;
			}
			if (x == arr[j][0] && y == arr[j][1] + 1)
			{
				down++;
			}
			if (x == arr[j][0]-1 && y == arr[j][1])
			{
				left++;
			}
			if (x == arr[j][0]+1 && y == arr[j][1])
			{
				right++;
			}
		}
		 score = 0;
		if (up && down && left && right)
		{
			for (int j = 0; j < n; j++)
			{
				if ((x == arr[j][0] - 1)&& (y == arr[j][1] - 1))
				{
					score++;
				}
				if ((x == arr[j][0] + 1) && (y == arr[j][1] - 1))
				{
					score++;
				}
				if ((x == arr[j][0] - 1) &&( y == arr[j][1] + 1))
				{
					score++;
				}
				if ((x == arr[j][0] + 1) && (y == arr[j][1] + 1))
				{
					score++;
				}
			}
			res[score]++;
		}
	}
	for (int i = 0; i < 5; i++)
	{
		cout << res[i] << endl;
	}
	return 0;
}