1232. Check If It Is a Straight Line.cpp

class Solution {
public:
    bool checkStraightLine(vector<vector<int>>& coordinates) {
        if(coordinates.size() <= 2) 
            return true;
        int x1=coordinates[0][0];
        int y1=coordinates[0][1];
        int x2=coordinates[1][0];
        int y2=coordinates[1][1];
        for(int i=1;i<coordinates.size();i++)
        {
            int x = coordinates[i][0];
            int y = coordinates[i][1];
            if( (y2 - y1) * (x1 -x )  != (y1 - y) * ( x2-x1 ) )
            {
                return false;
            }
        }
        return true;
    }
};