代码如下：

#include <stdio.h>
int main (){
    int n,i1,i2,i3,k=1;
    scanf ("%d",&n);
    for (i1=n;i1>=1;i1--){//i1是每行个数
        for (i2=k;i2<=k+i1;i2++){//i2是每行的输出元素，k是上一行个数
            printf ("%02d",i2);
            if (i2==i1+k-1){
                printf ("\n");
                k=k+i1+1;
            }
        }
    }
    return 0;
}