题目:
This time, you are supposed to find A+B where A and B are two polynomials.
Input Specification:
Each input file contains one test case. Each case occupies 2 lines, and each line contains the information of a polynomial:
K N1 aN1 N2 aN2 ... NK aNK
where K is the number of nonzero terms in the polynomial, Ni and aNi (i=1,2,⋯,K) are the exponents and coefficients, respectively. It is given that 1≤K≤10,0≤NK<⋯<N2<N1≤1000.
Output Specification:
For each test case you should output the sum of A and B in one line, with the same format as the input. Notice that there must be NO extra space at the end of each line. Please be accurate to 1 decimal place.
Sample Input:
2 1 2.4 0 3.2
2 2 1.5 1 0.5
Sample Output:
3 2 1.5 1 2.9 0 3.2
解析:
计算多项式加法。多项式已按照幂次从大到小排列。
输出要求先输出多项式项数,后按照幂次输出多项式。多项式系数保留一位小数。
答案:
#include<stdio.h>
#include<iostream>
using namespace std;
int main()
{
int k=0,count=0;//计数器
float arr[1001]={0};//保存多项式
int pow;
float temp;
//处理第一行
cin>>k;
count=k;
for(int i=0;i<k;i++)
{
cin>>pow;//记录幂次
cin>>arr[pow];//记录对应系数
}
//处理第二行
cin>>k;
count=count+k;
for(int i=0;i<k;i++)
{
cin>>pow;//记录幂次
if(arr[pow]!=0)//第一行已记录该幂次
{
count--;
}
cin>>temp;//记录系数
arr[pow]=arr[pow]+temp;//合并系数
if(arr[pow]==0)
{
count--;//项数减一
}
}
cout<<count;
for(int i=1000;i>=0;i--)
{
if(arr[i]!=0)
{
cout<<" "<<i<<" ";
printf("%.1f",arr[i]);
}
}
}
本文介绍了一种计算两个多项式相加的方法,并提供了一个C++实现示例。输入包括两个多项式的非零项及其指数和系数,输出为这两个多项式相加后的结果,输出格式与输入相同。
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