一元多项式求导

题源

PTA 乙级

题解

#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;
}