leetcode

0 class Solution {

1 public:

2 bool checkStraightLine(vector<vector<int>> &coordinates) {

3 int n = coordinates.size();

4 if (n == 2) return true;

5 int x0 = coordinates[0][0], y0 = coordinates[0][1];

6 int dx = coordinates[1][0] - x0, dy = coordinates[1][1] - y0;

7

8 for (int i = 1; i < n; i++) {

9 int x = coordinates[i][0], y = coordinates[i][1];

10 if (dx * (y - y0) != dy * (x - x0)) return false;

11 }

12 return true;

13 }

14 };