谁考了第k名:Wrong Answer

北大-计算概论

http://ica.openjudge.cn/basea/7/

#include<stdio.h>
#include<stdlib.h>
struct student
{
	long code;
	double score;
};
int comp(const void *a,const void *b)
{
	struct student *c = (struct student *) a;
	struct student *d = (struct student *) b;
	return d->score - c->score;
}
main()
{
	struct student a[100];
	int n,k;
	int i;
	
	scanf("%d%d",&n,&k);
	for(i=0;i<n;i++)
	{
		scanf("%ld%lf",&a[i].code,&a[i].score);
	}
	qsort(a,n,sizeof(a[0]),comp);
	printf("%ld %.1lf\n",a[k-1].code,a[k-1].score);
}