题解 | #判断直线相交#

import java.util.*;

public class CrossLine {
    public boolean checkCrossLine(double s1, double s2, double y1, double y2) {
        // write code here
        if(s1 == s2 && y1 != y2){
            return false;
        }else if(s1 == -s2 && y1 != y2){
            return false;
        }else return true;
}
}

本题需注意当斜率互为相反数时也算平行