题目链接:
https://pintia.cn/problem-sets/994805260223102976/problems/994805313708867584
AC代码:
#include <iostream>
#include <cstdio>
using namespace std;
int main(){
int a[1010]={0};
int k,e;
while(scanf("%d%d",&k,&e)!=EOF){
a[e]=k;//e为指数,k为系数
}
a[0]=0;//零次项求导之后为0
int count_=0;//记录系数不为0的个数
for(int i=1;i<=1000;i++){
a[i-1]=a[i]*i;//求导公式
a[i]=0;
if(a[i-1]!=0)count_++;
}
if(count_==0)//特殊情况
printf("0 0");
else{
for(int i=1000;i>=0;i--){
if(a[i]!=0){
printf("%d %d",a[i],i);
count_--;
if(count_!=0)
printf(" ");
}
}
}
}