题解 | #圣诞树#

#include <stdio.h>

int main()
{
    int a = 0;
    int b = 0;
    int c = 0;
    scanf("%d", &a);
    int d = a;
    int e = 0;
    int SB = 0;
    for (d = a; d > 0; d--)
    {
        b = 0;
            if (b < d)
            {
                printf(" ");
                printf(" ");
            }

                for (c = 1; c < d; c++)
                {
                    printf(" ");
                    printf(" ");
                    printf(" ");
                }
            
            printf("*");
            for (SB=d;  a-SB>0; SB++)
            {
                printf("     *");
            }
            printf("\n");


///////////////////////////////////////////

/////////////////////////////
                b = 0;
                if (b < d)
                    printf(" ");
                        for (c = 1; c < d; c++)
                        {
                            printf(" ");
                            printf(" ");
                            printf(" ");
                        }
                
                printf("* *");
                for (SB = d;  a - SB > 0; SB++)
                {
                    printf("   * *");
                }
                printf("\n");

/////////////////////////
                           for (c = 1; c < d; c++)
                           {
                               printf(" ");
                               printf(" ");
                               printf(" ");
                           }
                
                printf("* * *");
                for (SB = d;  a - SB > 0; SB++)
                {
                    printf(" * * *");
                }
                printf("\n");

                

                    //第一层移动n次，第二层移动n-1次，第三层移动n-2次，第n层移动n-n=0次；
        
    }
 ////////////////////////////////////////////
    for (b = 0; b < a; b++)
    {
        printf(" ");
        printf(" ");
        for (c = 1; c < a; c++)
        {
            printf(" ");
            printf(" ");
            printf(" ");
        }
        printf("*");
        printf("\n");
    }
}