I don't understand Why I get WA in test #9. I have test it with some random tests and it works fine
here is my code:

#include <stdio.h>
int x[15003],y[15003];

swap(i,p){
    int tmp=x[i];
    x[i]=x[p];
    x[p]=tmp;
    tmp=y[i];
    y[i]=y[p];
    y[p]=tmp;
}

quick_s(int l, int h){
    int p;
    if(h>l){
        p=partition(l,h);
        quick_s(l,p-1);
        quick_s(p+1,h);
    }
}

partition(int l, int h){
     int p=l,i,j;
     for(i=l;i<h;i++){
         if(x[i]<x[h]){
                swap(i,p);
                p++;
         }
     }
     swap(i,p);
     return p;
}


int main(){
    int n,i,s[15003],j,k;
  scanf("%d",&n);
  for(i=0;i<n;i++)
        scanf("%d %d",&x[i],&y[i]);
    quick_s(0,n-1);
  for(j=n-1;j>-1;j--){
      k=0;
    for(i=j-1;i>-1;i--)
        if(y[j]>=y[i]) k++;
      for(i=j+1;i<n;i++){
           if(x[i]!=x[j]) break;
          if(y[j]>=y[i]) k++;
    }
    s[k]++;
}
    for(i=0;i<n;i++)
     printf("%d\n",s[i]);
   return 0;
}

If someone can help me I would appreciate very much!
thanks