1010 一元多项式求导 (25 分)

#include<stdio.h>


int main()
{
    int a,b;
    int flag = 0;
    
    while(scanf("%d %d",&a,&b)!=EOF)
        {
            if(b!=0)
            {
                if(flag == 0)
                    printf("%d",a*b);
                else 
                    printf(" %d",a*b);
                
                printf(" %d",b-1);
                flag = 1;
            }
        }
    if(flag==0)printf("0 0");
    
    return 0;
}