1002. A+B for Polynomials

1002. A+B for Polynomials (25)

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

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <vector>
 4 
 5 using namespace std;
 6 class node{
 7 public:
 8     int expon;//exponents
 9     double coe;//coefficients
10     node(int _expon, double _coe) :expon(_expon), coe(_coe){}
11     ~node(){}
12 };
13 
14 
15 int main(void)
16 {
17     int N1;
18     cin >> N1;
19     vector<node> List1;
20     for (size_t i = 0; i < N1; i++)
21     {
22         int expon; double coe;
23         cin >> expon >> coe;
24         List1.push_back(node(expon, coe));
25     }
26     int N2;
27     cin >> N2;
28     vector<node> List2;
29     for (size_t i = 0; i < N2; i++)
30     {
31         int expon; double coe;
32         cin >> expon >> coe;
33         List2.push_back(node(expon, coe));
34     }
35 
36     vector<node>::iterator it1, it2;
37     it1 = List1.begin(); it2 = List2.begin();
38 
39     vector<node> List3;
40     while( (it1 != List1.end()) && (it2  !=List2.end()) )
41     {
42 
43         if ((*it1).expon == (*it2).expon)
44         {
45 
46             double coe_sum = (*it1).coe + (*it2).coe;
47             if (coe_sum != 0)
48                 List3.push_back(node((*it1).expon, coe_sum));
49             it1++; it2++;
50         }
51         else if ((*it1).expon > (*it2).expon)
52         {
53             List3.push_back(node((*it1).expon, (*it1).coe));
54             it1++;
55         }
56         else if ((*it1).expon < (*it2).expon)
57         {
58             List3.push_back(node((*it2).expon, (*it2).coe));
59             it2++;
60 
61         }
62 
63     }
64     while (it1 != List1.end()){ List3.push_back(node((*it1).expon, (*it1).coe)); it1++; }
65     while (it2 != List2.end()){ List3.push_back(node((*it2).expon, (*it2).coe)); it2++; }
66 
67     cout << List3.size();
68     for (size_t i = 0; i < List3.size(); i++)
69     {
70         cout << " " << List3[i].expon;
71         printf(" %0.1f", List3[i].coe);
72     }
73     cout << endl;
74     return 0;
75 }

分析：只需要注意一下输出的格式即好，这里用了C里面的输出函数

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原文地址：https://www.cnblogs.com/willwu/p/5324421.html