Two Lines

    	    #include <bits/stdc++.h>

    using namespace std;

    #define cin(vec) for(auto& i : vec) cin >> i
    #define cin_2d(vec, n, m) for(int i = 0; i < n; i++) for(int j = 0; j < m && cin >> vec[i][j]; j++);
    #define cout(vec) for(auto& i : vec) cout << i << " "; cout << "\n";
    #define cout_2d(vec, n, m) for(int i = 0; i < n; i++, cout << "\n") for(int j = 0; j < m && cout << vec[i][j] << " "; j++);
    #define cout_map(mp) for(auto& [f, s] : mp) cout << f << "  " << s << "\n";
    #define Time cerr << "Time Taken: " << (float)clock() / CLOCKS_PER_SEC << " Secs" << "\n";
    #define fixed(n) fixed << setprecision(n)
    #define ceil(n, m) (((n) / (m)) + ((n) % (m) ? 1 : 0))
    #define fill(vec, value) memset(vec, value, sizeof(vec));
    #define Num_of_Digits(n) ((int)log10(n)+1)
    #define all(vec) vec.begin(),vec.end()
    #define rall(vec) vec.rbegin(),vec.rend()
    #define sz(x) int(x.size())
    #define TC int t; cin >> t;   while(t--)
    #define fi first
    #define se second
    #define Pair pair < int, int >
    #define ll long long
    #define ull unsigned long long
    #define Mod  1'000'000'007
    #define OO 2'000'000'000
    #define EPS 1e-9
    #define PI acos(-1)
    #define imin INT_MIN
    #define imax INT_MAX
    #define getline(s) getline(cin >> ws , s)
    #define pb(x) push_back(x)
    #define to_decimal(bin) stoi(bin, nullptr, 2)

    void AbdEl3al () {
        ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
    #endif
        Time
    }

    bool is_parallel(int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4) {
        int m = (y2 - y1) / (x2 - x1);
        int n = (y4 - y3) / (x4 - x3);
        return (n == m);
    }

    int main () {
        AbdEl3al ();
        int x1, y1, x2, y2, x3, y3, x4, y4;
        cin >> x1 >> y1 >> x2 >> y2;
        cin >> x3 >> y3 >> x4 >> y4;
        is_parallel(x1, y1, x2, y2, x3, y3, x4, y4) ? cout << "YES" : cout << "NO";
        return 0;

    }