<swustoj>?id=1158 比成绩

#include <stdio.h>
int main()
{
    int n;
    int grade,averagegrade_1,sumgrade_1,averagegrade_2,sumgrade_2,count_1,count_2;
    int classnum;
    while(scanf("%d",&n)!=EOF)
    {
        count_1=count_2=0;
        sumgrade_1=sumgrade_2=0;
        while(n--)
        {
            scanf("%d%d",&grade,&classnum);
            if(classnum==1)
            {
                sumgrade_1+=grade;
                count_1++;
            }
            else
            {
                sumgrade_2+=grade;
                count_2++;
            }
        }
        averagegrade_1=sumgrade_1/count_1;
        averagegrade_2=sumgrade_2/count_2;
        printf("%d %d\r\n",averagegrade_1,averagegrade_2);
    }
    return 0;
}