星号三角形

//---------------------------------------
    *        *        *
   ***      ***      ***
  *****    *****    *****
 *******  *******  *******
***************************

//-------------------------------------

#include <stdio.h> 
#include <stdlib.h> 
int main() 
{ 
    int n; 
    scanf("%d",&n); 
    for (int i=1; i<=n; i++) 
        { 
             for (int j=1; j<=n-i; j++) 
                 printf(" "); 
             for (int j=1; j<=i*2-1; j++) 
                 printf("*"); 
             for (int j=1; j<=(n-i)*2; j++) 
                 printf(" "); 
             for (int j=1; j<=i*2-1; j++) 
                 printf("*"); 
             for (int j=1; j<=(n-i)*2; j++) 
                 printf(" "); 
             for (int j=1; j<=i*2-1; j++) 
                 printf("*"); 
             printf("\n"); 
         } 
    return 0; 
}