hdu2032杨辉三角

#include <stdio.h>int main(){int n;int a[30][30];int i,j;while (~scanf("%d",&n)){if(!(n>=1&&n<=30))break;for(i=0;i<n;i++){a[i][i]=1;a[i][0]=1;}for(i=2;i<n;i++)//i要从2开始{for(j=1;j<i;j++)//j要从一开始，并且j<i{a[i][j]=a[i-1][j]+a[i-1][j-1];}}for(i=0;i<n;i++){for(j=0;j<=i;j++)//j要<=iif(j==0)printf("%d",a[i][j]);else printf(" %d",a[i][j]);//输出与空格printf("\n");}printf("\n");}return 0;}