1002. A+B for Polynomials (25)

#include<stdio.h>
#include<math.h>
#include<string.h>

#define MAX 1000
double p[MAX+1];

int main()
{
int aNum;
while( scanf("%d", &aNum) != EOF )
{
//initial
memset(p, 0, sizeof(p[0])*(MAX+1));
//input a
int e;
double c;
while(aNum--)
{
scanf("%d%lf", &e, &c);
p[e] += c;
}
//input b
int bNum;
scanf("%d", &bNum);
while(bNum--)
{
scanf("%d%lf", &e, &c);
p[e] += c;
}
//output
int cnt = 0;
for(int i = 0; i <= MAX; ++i)
if( fabs(p[i]) > 1e-6 ) cnt++;

printf("%d", cnt);
for(int i = MAX; i >= 0; --i)
{
if( fabs(p[i]) > 1e-6 )
printf(" %d %.1lf", i, p[i]);
}
printf("\n");
}
return 0;
}