View Code of Problem 67

    #include <stdio.h>
    int main()
    {
        int x1,y1,x2,y2,x3,y3,x4,y4;
        while(scanf("%d %d %d %d %d %d %d %d",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4)!=EOF)
        {
                float k1=1.0*(y2-y1)/(x2-x1);
                float k2=1.0*(y3-y4)/(x3-x4);
                if(k1!=k2)
                    printf("Yes\n");
                else
                {
                    float b1=y2-k1*x2;
                    float b2=y3-k2*x3;
                    if(b1==b2)
                        printf("Yes\n");
                    else
                    {
                        printf("No\n");
                    }
                }
        }
    }

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