ارسال شماره 960

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int[][] arr = new int[3][2];
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 2; j++) {
                arr[i][j] = sc.nextInt();
            }
        }
        
        if (arr[0][0]-arr[1][0]==0) {
            System.out.println("No");
            return;
        }


        float m = (arr[0][1]-arr[1][1])/(arr[0][0]-arr[1][0]);

        float c = arr[0][1]-m*arr[0][0];

        if (arr[2][1]==m*arr[2][0]+c){
            System.out.println("No");
            return;
        }
        System.out.println("Yes");
    }
}