PAT(Advanced level) 1002. A+B for Polynomials

原题链接：http://pat.zju.edu.cn/contests/pat-a-practise/1002

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 3.22 2 1.5 1 0.5

Sample Output

3 2 1.5 1 2.9 0 3.2

#include <stdio.h>#include <vector>#include <algorithm>using namespace std;struct Term{  int exp;//指数  double coe;//系数};const double threshold = 0.0000001;void PrintTerm(Term term){  printf(" %d %0.1lf", term.exp, term.coe);}int main(){  int k1, k2;  vector<Term> line1;  vector<Term> line2;  vector<Term> sum;  scanf("%d", &k1);  for(int i=0; i<k1; ++i)  {    Term term;    scanf("%d %lf", &term.exp, &term.coe);    line1.push_back(term);  }  scanf("%d", &k2);  for(int i=0; i<k2; ++i)  {    Term term;    scanf("%d %lf", &term.exp, &term.coe);    line2.push_back(term);  }  int i=0,j=0;  for(; i<k1 && j<k2; )  {    if(line1[i].exp == line2[j].exp)    {      Term term;      term.exp = line1[i].exp;      term.coe = line1[i].coe+line2[j].coe;      if(term.coe > threshold || term.coe < -threshold)      {        sum.push_back(term);      }      ++i;      ++j;    }    else if (line1[i].exp < line2[j].exp)    {      sum.push_back(line2[j]);      ++j;    }    else     {      sum.push_back(line1[i]);      ++i;    }//end if  }// end for  while(i < k1)  {    sum.push_back(line1[i]);    ++i;  }  while(j < k2)  {    sum.push_back(line2[j]);    ++j;  }  printf("%d", sum.size());  for_each(sum.begin(), sum.end(), PrintTerm);  printf("\n");  line1.clear();  line2.clear();  sum.clear();  return 0;}