T. Two Lines

#include <iostream>
#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
using namespace std;


int main() {
   ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);

long double x1,y1,x2,y2;
cin>>x1>>y1>>x2>>y2;
long double a1,b1,a2,b2;
cin>>a1>>b1>>a2>>b2;
long double m1=(y2-y1)/(x2-x1);
long double m2=(b2-b1)/(a2-a1);
if(m1==m2) cout<<"YES";
else       cout<<"NO";

    return 0;
}