149. Max Points on a Line

class Solution {
public:
    int maxPoints(vector<vector<int>>& points) {

        if(points.size()==1)
            return 1;
        if(points.size()==2)
            return 2;  

        int max = 0, maxPoint = 0;
        unordered_map<double, int> m;
        for(int i=0;i<points.size();i++){
            for(int j=0;j<points.size();j++){
                if(i==j)continue;
                double y=points[i][1]-points[j][1];
                double x=points[i][0]-points[j][0];
                if(x==0){
                    m[INT_MAX]++;
                    continue;
                }
                double res=y/x;
                m[res]++;
            }
            for(auto it :m){
                if(it.second > maxPoint){
                    maxPoint=it.second;
                }
            }
            if(maxPoint>max){
                max=maxPoint;
            }
            m.clear();
        }
        return max+1;
        
    }
};