DistantaPunctDreapta

#include <bits/stdc++.h>

using namespace std;
ifstream fin("distantapunctdreapta.in");
ofstream fout("distantapunctdreapta.out");

void getLine(int x1, int y1, int x2, int y2, int &a, int &b, int &c)
{
    /// (x- p1X) / (p2X - p1X) = (y - p1Y) / (p2Y - p1Y)
    a = y1 - y2;
    b = x2 - x1;
    c = x1 * y2 - x2 * y1;
}

double dist(int pct1X, int pct1Y, int pct2X, int pct2Y, int pct3X, int pct3Y)
{
    int a, b, c;
    getLine(pct2X, pct2Y, pct3X, pct3Y, a, b, c);
    return abs(a * pct1X + b * pct1Y + c) / sqrt(a * a + b * b);
}

int main()
{
    int x1,y1,x2,y2,x3,y3;
    double d;
    fin>>x1>>y1>>x2>>y2>>x3>>y3;
    d=dist(x1,y1,x2,y2,x3,y3);
    d=floor(d*100)/100;
    fout<<setprecision(2)<<fixed<<d;

    return 0;
}