PAT A 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.

2 1 2.4 0 3.22 2 1.5 1 0.5Sample Output
3 2 1.5 1 2.9 0 3.2
// 题目分析：
直接用数组存储多项式，下标代表指数，方便；缺点，效率较低
//代码
#include <iostream>#include <vector>using namespace std;int main(){	double p1[1001]={0};	double p2[1001]={0};	double p3[1001]={0};	int K,n;	double a;	cin>>K;	for(int i=0;i<K;i++){		cin>>n>>a;		p1[n]=a;	}	cin>>K;	for(int i=0;i<K;i++){		cin>>n>>a;		p2[n]=a;	}	int count=0;	for(int i=0;i<1001;i++){		p3[i]=p1[i]+p2[i];		if(p3[i])			count++;	}	cout<<count;	for(int i=1000;i>=0;i--){		if(p3[i])			PRintf(" %d %.1f",i,p3[i]);	}	system("pause");	return 0;}