for (int i = 1; i <= h; i++)
{
	for (int j = 1; j <= w; j++)
	{
		cin >> mp[i][j]; //为啥这里换成getchar()就会出错？
		vis[i][j] = false;
		if (mp[i][j] == '@')
		{
			ii = i;
			jj = j;
		}
	}
}