题解 | 圣诞树

#include <stdio.h>
int main()
{
    int n = 0;
    while (scanf("%d", &n) != EOF)
    {
        for (int i = 1; i <= n; i++)
        {
            for (int m = 1; m <= 3; m++)
            {
                for (int j = 0; j < n - i; j++)
                {
                    printf("   ");
                }
                switch (m)
                {
                case 1:
                {
                    for (int k = 0; k < i; k++)
                    {
                        printf("  *   ");
                    }
                    break;
                }
                case 2:
                {
                    for (int k = 0; k < i; k++)
                    {
                        printf(" * *  ");
                    }
                    break;
                }
                case 3:
                {
                    for (int k = 0; k < i; k++)
                    {
                        printf("* * * ");

                    }
                    break;
                }
                }
                printf("\n");
            }
        }
        for (int i = 0; i < n; i++)
        {
            for (int j = 0; j < 3 * n - 1; j++)
            {
                printf(" ");
            }
            printf("*\n");
        }
    }
    return 0;
}