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public class a
{
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    public static void main(String[] args)
    {
    int i,j,k,x;
    // TODO, add your application code
    System.out.println("ÇëÊäÈëÒª´òÓ¡³öͼÐεÄÅÅÊý£º");
       
    Scanner sc = new Scanner(System.in);
      x = sc.nextInt();
   
    for(i=1;i <=(x-1)/2;i++)
    {
    for(j=1;j <=21-i;j++)
    System.out.print(" ");
    for(k=1;k <=(2*i)-2;k++)
    System.out.print("*");
    System.out.println("*");
    }
    }
}

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λÖ㺠Àà a
      Scanner sc = new Scanner(System.in);

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import java.util.Scanner;

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CLASSPATH=.;C:\Program Files\Java\jdk1.5.0_13\lib

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