1002. A+B for Polynomials (25)

#include "stdafx.h"
#include <iostream>
#include <map>using namespace std;int main()
{int n1;scanf("%d", &n1);map<int, double> id;int i, a;double b;for(i = 1; i <= n1; i++){scanf("%d%lf", &a, &b);id[a] = b;}int n2;scanf("%d", &n2);for(i = 1; i <= n2; i++){scanf("%d%lf", &a, &b);id[a] += b;}int count = 0;double second;map<int, double> ::reverse_iterator it;for(it = id.rbegin(); it != id.rend(); it++){second = it->second;if(second != 0){count++;}}printf("%d", count);int first;for(it = id.rbegin(); it != id.rend(); it++){first = it->first;second = it->second;if(second != 0){printf(" %d %.1lf", first, second);}}printf("\n");system("pause");return 0;
}