Force buckle 1037 Effective boomerang

subject

Given an array points , among points[i] = [xi, yi] Express X-Y A point on the plane , If these points form a Boomerang Then return to true .

Boomerang Defined as a set of three points , These points Each are not identical And Not in a straight line .

source ： Power button （LeetCode）
link ：https://leetcode.cn/problems/valid-boomerang

Vector cross product

Code

class Solution {
    public boolean isBoomerang(int[][] points) {
        //  Vector cross product 
return (points[0][0] - points[1][0]) * (points[1][1] - points[2][1]) - (points[0][1] - points[1][1]) * (points[1][0] - points[2][0]) != 0;
    }
}