1002 A+B for Polynomials (25)（25 point(s)）

problem

1002 A+B for Polynomials (25)（25 point(s)）
This time, you are supposed to find A+B where A and B are two polynomials.

Input

Each input file contains one test case. Each case occupies 2 lines, and each line contains the information of a polynomial: K N1 a~N1~ N2 a~N2~ ... NK a~NK~, where K is the number of nonzero terms in the polynomial, Ni and a~Ni~ (i=1, 2, ..., K) are the exponents and coefficients, respectively. It is given that 1 <= K <= 10，0 <= NK < ... < N2 < N1 <=1000.

Output

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

anwser

#include<iostream>
#include<stdio.h>
#include<iomanip> 
#include<cstring>

int main()
{
    freopen("test.txt", "r",stdin);
    float n[1001], n1[1001], n2[1001];
    memset(n, 0, 1001*sizeof(float));
    memset(n1, 0, 1001*sizeof(float));
    memset(n2, 0, 1001*sizeof(float));
    int a, b;
    
    
    std::cin>>a;
    for(int i = 0; i < a; i++){
        int temp1;
        float temp2;
        std::cin>>temp1>>temp2;
        n1[temp1] = temp2;
    }
    
    std::cin>>b;
    for(int i = 0; i < b; i++){
        int temp1;
        float temp2;
        std::cin>>temp1>>temp2;
        n2[temp1] = temp2;
    }
    
    int c = 0;
    for(int i = 0; i < 1001; i++){
        n[i] = n1[i] + n2[i];
//      std::cout<<n[i]<<i<<std::endl;
        if(n[i] != 0) c++;
    }
    std::cout<<c;
    for(int i = 1000; i >= 0; i--){
        if(n[i] != 0) {
            std::cout<<" "<<i<<" ";
            std::cout<<std::fixed<<std::setprecision(1)<<n[i];
//          printf("%.1f", n[i]);
        }
    }
    return 0;
}

/*
2 1 2.4 0 3.2
2 2 1.5 1 0.5
*/

experience

• 注意頭文件名
• 注意邊界條件以及輸出格式

單詞複習：

• polynomials 多項式
• exponents 範例，指數
• coefficients 係數
• respectively 分別的
• accurate 精確的
• decimal 小數