题解 | #空心三角形图案#

#include <stdio.h>

int main()
{
    int n = 0;

    while (1 == scanf("%d", &n))
    {
        for (int i = 0; i < n; i++)
        {
            for (int j = 0; j <= i; j++)
            {
                if (0 == i || (n - 1) == i)
                {
                    printf("* ");
                }
                else
                {
                    if (0 == j || i == j)
                    {
                        printf("* ");
                    }
                    else
                    {
                        printf("  ");
                    }
                }
            }
            printf("\n");
        }
    }

    return 0;
}