#include <iostream>
using namespace std;
int main() {
	int n;
	cin >> n;
	int** a = new int* [n];
	for (int i = 0; i < n; i++) {
		a[i] = new int[n];
		for (int j = 0; j < n; j++)
			cin >> a[i][j];
	}
	for (int i = 0; i <n/2; i++) {
		for (int j = 0; j < n; j++)
			swap(a[i][j], a[n - i - 1][j]);
	}
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++)
			cout << a[i][j] << " ";
		cout << endl;
	}
	return 0;
}

需要注意：只看行翻转，i<n/2，且交换a[i][j]与a[n - i - 1][j]的值即可