2439번, 2440번, 2441번

2439번

#include<iostream>
using namespace std;

int main()
{
	int n = 0;
	cin >> n;
	for (int j = 0; j < n; j++)
	{
		for (int i = n - j; i > 1; i--)
		{
			cout << ' ';

		}
		for (int i = 0; i <= j; i++)
		{
			cout << '*';
		}
		cout << '\n';
	}
	
}

 

2440번

#include<iostream>
using namespace std;

int main()
{
	int n = 0;
	cin >> n;
	for (int i = 0; i < n; i++)
	{
		for (int j = n - i; j > 0; j--)
		{
			cout << '*';
		}
		cout << '\n';
	}
}

 

2441번

#include<iostream>
using namespace std;

int main()
{
	int n = 0;
	cin >> n;
	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j < i; j++)
		{
			cout << ' ';
		}
		for (int j = n - i; j > 0; j--)
		{
			cout << '*';
		}
		
		cout << '\n';
	}
}