*/-->

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蓝桥杯：打印图形

标题：打印图形

小明在 X 星球的城堡中发现了如下图形和文字：
rank=3

   *
  * *
 *   *
* * * *

rank=5

               *
              * *
             *   *
            * * * *
           *       *
          * *     * *
         *   *   *   *
        * * * * * * * *
       *               *
      * *             * *
     *   *           *   *
    * * * *         * * * *
   *       *       *       *
  * *     * *     * *     * *
 *   *   *   *   *   *   *   *
* * * * * * * * * * * * * * * *

ran=6

                               *
                              * *
                             *   *
                            * * * *
                           *       *
                          * *     * *
                         *   *   *   *
                        * * * * * * * *
                       *               *
                      * *             * *
                     *   *           *   *
                    * * * *         * * * *
                   *       *       *       *
                  * *     * *     * *     * *
                 *   *   *   *   *   *   *   *
                * * * * * * * * * * * * * * * *
               *                               *
              * *                             * *
             *   *                           *   *
            * * * *                         * * * *
           *       *                       *       *
          * *     * *                     * *     * *
         *   *   *   *                   *   *   *   *
        * * * * * * * *                 * * * * * * * *
       *               *               *               *
      * *             * *             * *             * *
     *   *           *   *           *   *           *   *
    * * * *         * * * *         * * * *         * * * *
   *       *       *       *       *       *       *       *
  * *     * *     * *     * *     * *     * *     * *     * *
 *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

小明开动脑筋，编写了如下的程序，实现该图形的打印。

#include <cstdio>

#define N 70

void f(char a[][N], int rank, int row, int col)
{
    if(rank==1){
        a[row][col] = ‘*‘;
        return;
    }

    int w = 1;
    int i;
    for(i=0; i<rank-1; i++) w *= 2;

    f(a,rank-1,row, col + w/2);
    f(a, rank-1, row+w/2, col);
    f(a, rank-1, row+w/2, col+w);
}

int main()
{
    char a[N][N];
    int i,j;
    for(i=0;i<N;i++)
    for(j=0;j<N;j++) a[i][j] = ‘ ‘;

    f(a,6,0,0);

    for(i=0; i<N; i++){
        for(j=0; j<N; j++) printf("%c",a[i][j]);
        printf("\n");
    }

    return 0;
}