网址:http://zju.acmclub.com/index.php?app=problem_title&id=1&problem_id=1034

#include<stdio.h>
int main()
{int n;while(scanf("%d",&n) != EOF){int i;for(i = 0; i < n; i++){  int j;for(j = 0; j < n - i - 1; j++)printf(" ");for(j = 0; j < i + 1; j++)printf("%d",j + 1);for(j = i; j > 0; j--)printf("%d",j);printf("\n");}for(i = 0; i < n - 1; i ++){int j;for(j = 0; j < i + 1; j++)printf(" ");for(j = 0; j < n - i -1; j++)printf("%d",j + 1);for(j = n - i - 2; j > 0; j--)printf("%d",j);printf("\n");}}return 0;
}