Coding Marathon I - UnP (challenges 2, 4, 6)

Dois.java

import java.util.Scanner;

public class Dois 
{
	public static void main(String[] args) 
	{	
		Scanner in = new Scanner(System.in);
		
		int n = in.nextInt();
		
		for(int i = 0; i < n; i++)
		{
			int x = in.nextInt();
			
			int[] a = getSequencia();
			if(x > 0)
			{
				System.out.println( 
							somaRecursiva(a[x-1]) +
							" " +
							( somaRecursiva(a[x-1]) + (a[x-1] + 1) ) 
						  );
			}
		}
		
		in.close();	
	}

//	retorna sequencia de 2 em 2 
//	Ex: 1,3,7...
	public static int[] getSequencia()
	{
		int vetor[] = new int[2000];
		
		int aux = 1;
		for(int i = 0; i < 2000; i++)
		{
			vetor[i] = aux;
			aux+=2;
		}
		
		return vetor;
	}
	
//	tipo fatorial soh que a operacao matematica eh soma
	public static int somaRecursiva(int i)
	{
		int r = 0;
		
		int aux = i;
		for(int j = 0; j < aux; j++)
		{
			r += i;
			i--;
		}
		
		return r;
	}
}

Quatro.java

import java.util.Scanner;

public class Quatro 
{
	public static void main(String[] args) 
	{
		Scanner in = new Scanner(System.in);
		
		int n = in.nextInt();
		
		for(int w = 0; w < n; w++)
		{
			Scanner in2 = new Scanner(System.in);
			String str = in2.nextLine();
			
			if(str.length() < 80) 
			{
				str = str.replace("!", "");
				str = str.replace("?", "");
				str = str.replace(",", "");
				str = str.replace(" ", "");
				
				str = str.replaceAll("[1-9]", "");
						
				String  strTratada = str.replaceAll("[aeoiu]", "*");
				
				int vogais = 0;
				for(int i = 0; i < strTratada.length(); i++)
				{
					if(strTratada.charAt(i) == '*')
					{
						vogais++;
					}
				}
				
				System.out.println(vogais);
				System.out.println( (strTratada.length() - vogais) );	
			}
			
			in2.close();
		}
		
		in.close();
	}
}

Seis.java

import java.util.Scanner;

public class Seis 
{	
	public static void main(String[] args) 
	{
		Scanner in = new Scanner(System.in);
		
		int n = in.nextInt();
		
		for(int i = 0; i < n; i++)
		{
			int x = in.nextInt();
			int y = in.nextInt();

			if( 
				(x >= 0) && (x <= 100) &&
				(y >= 0) && (y <= 100)	
			  )
			{
				int result = 0;
				if(x > 2 || y > 2)
				{
					result = (y - 1) * (x - 1);
				}
				System.out.println(result);
			}
		}
		
		in.close();
	}
	
}