题解 | 点到直线距离

#include <bits/stdc++.h>
using namespace std;

struct point{
    double x,y;
    point(double A,double B){
        x=A,y=B;
    }
    point() = default;
};

struct line{
    point point_A,point_B;
    line(point A,point B){
        point_A = A,point_B = B;
    }
    line() = default;
};

double getDistance(point P, line L){
    // TODO: 计算点P到直线L的距离（两点式）
    double a=abs((L.point_A.x-L.point_B.x)*(P.y-L.point_B.y)-(L.point_A.y-L.point_B.y)*(P.x-L.point_B.x));
    double n=sqrt((L.point_A.x-L.point_B.x)*(L.point_A.x-L.point_B.x)+(L.point_A.y-L.point_B.y)*(L.point_A.y-L.point_B.y));
    return a/n;

}