#include <bits/stdc++.h>
using namespace std;
int nx[25][25];
int x, y;
int k=1;

void huanfang(int n)
{
	int f=1;
	for (int i=1; i<=n; i++)
	{
		for (int j=1; j<=n; j++)
		{
			if (nx[i][j] == 0)
				f = 0;	
		}
	}
	if (f == 1)
		return ;
	k++;
	if (y == 1)
		y = n;
	else
		y--;
	if (x == n)
		x = 1;
	else
		x++;
	if (nx[x][y] == 0)
		nx[x][y] == k;
	else
	{
		if (y == n)
		{
			y = 1;
			x = 1;
		}
		else
			y++;
		nx[x][y] = k;
	}
	huanfang(n);
}

int main()
{
	int n;
	cin >> n;
	x = n/2+1;
	y = 1;
	nx[x][y] = k;
	huanfang(n);
	for (int i=1; i<=n; i++)
	{
		for (int j=1; j<=n; j++)
			cout << nx[i][j] << ' ';
		cout << endl;
	}
	return 0;
}

本地运行返回值就很奇怪，一测就是TLE……