https://www.patest.cn/contests/pat-b-practise/1036

#include 
     
      using namespace std;int main(){	int n,col,row,t1;	double t2;	char c;	scanf("%d %c",&n,&c);		t1 = n/2;	t2 = n*1.0/2;	if(t2-t1<0.5)	row = n/2;	else row = n/2 + 1; 		col = n;	for(int i = 0;i < row; i++)	{		if(i == 0||i == row-1)		{			for(int j = 0;j < n; j++)			{				printf("%c",c);				if(j == col-1) printf("\n");			} 		}		else {			for(int j = 0;j < n; j++)			{				if(j == 0 || j == col-1)printf("%c",c);				else printf(" ");				if(j == col-1)	printf("\n");			}		}	}	return 0;}