题解 | #箭形图案#

#include<stdio.h>
#include <stdlib.h>
int main()
{
    int n;
    while(scanf("%d",&n)!=EOF)
    {
        for(int i=1;i<=2*n+1;i++)
        {
            for(int j=1;j<=2*n+1;j++)
            {
                if(j<=abs((2*n+1)-(2*i-1))||abs(j-(2*n+1))+abs(i-(n+1))<=n-1)printf(" ");
                else printf("*");
            }
            printf("\n");
        }
    }
}