1232. Check If It Is a Straight Line.cpp

class Solution {
public:
    bool checkStraightLine(vector<vector<int>>& coordinates) {
        int n = coordinates.size();

        int x1 = coordinates[0][0];
        int y1 = coordinates[0][1];

        int x2 = coordinates[1][0];
        int y2 = coordinates[1][1];

        for(int i = 2; i < n; i++){
            int x = coordinates[i][0];
            int y = coordinates[i][1];

            if((y - y1) * (x - x2) != (y - y2) * (x - x1)){
                return false;
            } 
        }
        return true;
    }
};