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 N?1?? a?N?1???? N?2?? a?N?2???? ... N?K?? a?N?K????
where K is the number of nonzero terms in the polynomial, N?i?? and a?N?i???? (i=1,2,?,K) are the exponents and coefficients, respectively. It is given that 1≤K≤10,0≤N?K??<?<N?2??<N?1??≤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
本题考察的就是简单的编程基础,但是通过率却很低,感觉应该是有的同学没有考虑到一些细节,所以在这里啰嗦几句。
本题大意就是简单的多项式加法,将系数加起来输出。主要有两个坑要注意:
1、题目末尾这句保留一位小数真不是废话,题目会给多位小数的系数,所以输出时一定要注意保留一位小数。
2、题目要求结果末尾一定不能有空格,但在本题中我们也不知道一共有多少的数据要输出,所以要注意数据结构的选取。再一个就是本题最后一个测试点的输出只有一个0,算是一个特例,这个0后面的空格也不能加。
在本题中我选了vector+pair来保存结果,这样可以借助vector可以索引的特点来控制空格的输出。代码如下:
#include<bits/stdc++.h>
using namespace std;
int main()
{int num1,num2,n;float N1[1001],N2[1001],a;for(int i=0;i<1001;i++)N1[i]=N2[i]=0;vector<pair<int,float> > res; cin>>num1;for(int i=0;i<num1;i++){cin>>n>>a;N1[n]=a;}cin>>num2;for(int i=0;i<num2;i++){cin>>n>>a;N2[n]=a;}for(int i=0;i<1001;i++){float temp=N1[i]+N2[i];if(temp!=0)res.push_back(make_pair(i,temp));}cout<<res.size();if(res.size()!=0)cout<<" ";for(int i=res.size()-1;i>=0;i--){cout<<res[i].first<<" ";printf("%.1f",res[i].second);if(i!=0)cout<<" ";}return 0;
}