118B_PresentfromLena.cpp

/*
~ Author    : @tridib_2003
~ Title     : 118B. Present from Lena
~ Link      : https://codeforces.com/contest/118/problem/B
*/

#include<bits/stdc++.h>
using namespace std;

int main() {

	ios::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);

	int n;
	cin >> n;
	for (int i = 0; i <= n; i++)
	{
		for (int j = n; j > i; j--)
		{
			cout << "  ";
		}
		for (int j = 0; j <= i; j++)
		{
			cout << j;
			if (i != 0)
			{
				cout << " ";
			}
		}
		for (int j = i - 1; j >= 0; j--)
		{
			cout << j;
			if (j != 0)
			{
				cout << " ";
			}
		}
		cout << endl;
	}
	for (int i = n - 1; i >= 0; i--)
	{
		for (int j = n; j > i; j--)
		{
			cout << "  ";
		}
		for (int j = 0; j <= i; j++)
		{
			cout << j;
			if (i != 0)
			{
				cout << " ";
			}
		}
		for (int j = i - 1; j >= 0; j--)
		{
			cout << j;
			if (j != 0)
			{
				cout << " ";
			}
		}
		cout << endl;
	}

	return 0;
}