C++代码如下：

# include 
# include 
using namespace std;
int main()
{
	int m, n;
	cin >> m >> n;
	int a[200][200];
	for (int i = 0; i < m; i++)               //二维数组输入
		for (int j = 0; j < n; j++)
			cin >> a[i][j];
	int num = 0;
	int i = 0, j = 0;
	int flag = 1;              //flag代表方向
	int aflag=m, bflag=n, cflag=0, dflag=1;    //记录每一个方向的最后一个位置
	vector b;                    //向量来记录数组输出顺序
	while (num != m * n)
	{
		b.push_back(a[i][j]);
		if (flag == 1)
		{
			if (i < aflag-1)
				i++;
			else
			{
				flag = 2;
				j++;
				aflag--;
			}
			num++;
			continue;
		}
		if (flag == 2)
		{
			if (j< bflag - 1)
				j++;
			else
			{
				flag = 3;
				i--;
				bflag--;
			}
			num++;
			continue;
		}
		if (flag == 3)
		{
			if (i >cflag)
				i--;
			else
			{
				flag = 4;
				j--;
				cflag++;
			}
			num++;
			continue;
		}
		if (flag == 4)
		{
			if (j >dflag)
				j--;
			else
			{
				flag = 1;
				i++;
				dflag++;
			}
			num++;
			continue;
		}
	}
	for (int i = 0; i < b.size()-1; i++)       
		cout << b[i]<<" ";
	cout << b[b.size() - 1];
	return 0;
}