浙大 PAT a1002

#include<stdio.h>#define max 1024int main(){double a[max]={0};double t=0;int i=0,in=0,x1=0,x2=0;scanf("%d",&x1);for(i=0;i<x1;i++){scanf("%d",&in);scanf("%lf",&a[in]);}scanf("%d",&x1);for(i=0;i<x1;i++){scanf("%d",&in);scanf("%lf",&t);a[in]=a[in]+t;}for(i=0;i<max;i++){if(a[i]!=0)x2++;}printf("%d",x2);for(i=max-1;i>=0;i--){if(a[i]!=0)printf(" %d %.1lf",i,a[i]);}return 0;}