0度就是没变

90度是关键

180度就是转2次90度

270度就是转3次90度

#include<iostream>
#include<vector>
using namespace std;

/*输出一个2维数组*/
void print(vector<vector<int>>& a)
{
	int n = a.size();
	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j < n; j++)
		{
			cout << a[i][j] << " ";
		}cout << endl;
	}
}

/*旋转90度*/
vector<vector<int>> reverse_90(vector<vector<int>> a)
{
	int n = a.size();
	vector<vector<int>> b(n, vector<int>(n));
	for (int i = 0; i < n; i++)
		for (int j = 0; j < n; j++)
		{
			b[i][j] = a[n - j - 1][i];
		}
	return b;
}

int main()
{
	int n;
	while (cin >> n)
	{
		vector<vector<int>> a(n, vector<int>(n));
		vector<vector<int>> b(n, vector<int>(n));
		for (int i = 0; i < n; i++)
			for (int j = 0; j < n; j++)
			{
				cin >> a[i][j];
			}
		for (int i = 0; i < n; i++)
			for (in...