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 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

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

天天进步：
1、#include &cout<

#include <iostream>
using namespace std;
#include<iomanip>
struct Node
{
    double coef;
    int exp;
};
int sum(Node* firstList,int M,Node* secondList,int N,Node* sumList);

int main()
{
    int M,N;
    cin>>M;
    Node *firstList=new Node[M];
    for(int i=0;i<M;i++)
    {
        double xiShu;
        int zhiShu;
        cin>>zhiShu>>xiShu;
        firstList[i].coef=xiShu;
        firstList[i].exp=zhiShu;
    }
    cin.clear();//重置错误输入
    cin.sync();//清空缓冲区  
    cin>>N;
    Node *secondList=new Node[N];
    for(int i=0;i<N;i++)
    {
        double xiShu;
        int zhiShu;
        cin>>zhiShu>>xiShu;
        secondList[i].coef=xiShu;
        secondList[i].exp=zhiShu;
    }
    Node *sumList=new Node[M+N];
    int num=sum(firstList,M,secondList,N,sumList);
    delete firstList;
    delete secondList;
    cout<<num;
    for(int i=0;i<num;i++)
    {
        cout<<" "<<sumList[i].exp<<" "<<fixed<<setprecision(1)<<sumList[i].coef;
    }
    delete sumList;
   return 0;
}

int sum(Node* firstList,int M,Node* secondList,int N,Node* sumList)
{
    int i=0,j=0,k=0,t=0;
    while(i<M&&j<N)
    {
        if(firstList[i].exp>secondList[j].exp)
        {
            sumList[k].exp=firstList[i].exp;
            sumList[k].coef=firstList[i].coef;
            i++;
        }
        else if(firstList[i].exp<secondList[j].exp)
        {
            sumList[k].exp=secondList[j].exp;
            sumList[k].coef=secondList[j].coef;
            j++;
        }
        else
        {
            sumList[k].exp=firstList[i].exp;
            t=firstList[i].coef+secondList[j].coef;
            if(t!=0) sumList[k].coef=firstList[i].coef+secondList[j].coef;
            else k--;
            i++;
            j++;
        }
        k++;
    }
    while(j<N)
    {
        sumList[k].exp=secondList[j].exp;
        sumList[k].coef=secondList[j].coef;
        j++;
        k++;
    }
    while(i<M)
    {
        sumList[k].exp=firstList[i].exp;
        sumList[k].coef=firstList[i].coef;
        i++;
        k++;
    }
    return k;
}