PTA L1-002 打印沙漏 (20分)

#include<stdio.h>

int main(void)
{
    int n;
    char ch;
    scanf("%d %c",&n,&ch);
    int i,j,number=0;
    for(i=1;number*2-1<=n;i++){
        number=0;
        for(j=1;j<=i;j++){
        number=number+2*j-1;
        }
    }
    i=i-1;
    number=2*(number-2*i+1)-1;
    i=i-1;
    int m,k,beifen=i;
    
    for(m=1;m<=i;m++)
    {
        for(k=1;k<m;k++)printf(" ");
        for(k=2*beifen-1;k>=1;k--)printf("%c",ch);
        beifen--;
        printf("\n");
    }
    beifen=i;
    for(m=2;m<=i;m++)
    {
        for(k=beifen;k>2;k--)printf(" ");
        for(k=1;k<=2*m-1;k++)printf("%c",ch);
        beifen--;
        printf("\n");
    }
    printf("%d\n",n-number);
    return 0;
}