Stars POJ

#include<iostream>
#include<algorithm>
#include<cstring>
#include<cstdio>
using namespace std;
const int N=32005;
int a[N];
int tr[N];
int level[N];
int n,m;
int lowbit(int x)
{
    return x& -x;
} 
void add(int x,int c)
{
    for(int i=x;i<=N;i+=lowbit(i))
        tr[i]+=c;
}
int sum(int x)
{
    int res=0;
    for(int i=x;i;i-=lowbit(i))
        res+=tr[i];
    return res;
}
int main()
{
    int x,y ;
    while(cin>>n)
    {
        memset(tr,0,sizeof tr);
        memset(a,0,sizeof a);
        memset(level,0,sizeof level);
       for(int i=0;i<n;++i)
       {
        int x, y;
        scanf("%d %d",&x,&y);
        ++ x;
        level[sum(x)] ++;
        add(x,1);
       }
       for(int i = 0;i<n;++ i)
        printf("%d
",level[i]);
    }
    return 0 ;

}