195D - Analyzing Polyline - CodeForces Solution

#include <bits/stdc++.h>
using namespace std;
int n;
long double k,b;
set<long double> q;
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>k>>b;
		if(k>0||k<0) 
        {
           q.insert(-b*1.0/k);

        }
	}

	cout<<q.size();
	return 0;
}