View Code of Problem 67

#include<stdio.h>
int main(){
	int x1,y1,x2,y2,x3,y3,x4,y4;
	double k1,k2,b1,b2;
	while(scanf("%d %d %d %d\n%d %d %d %d",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4)!=EOF){
		int differ_1=x2-x1;
		int differ_2=x4-x3;
		if(differ_1==0&&differ_2==0){
			if(x1!=x3){
				printf("No\n");
			}
			else{
				printf("Yes");
			}
		
		}
		else{
			if(differ_1==0||differ_2==0){
				printf("Yes\n");
			}
			else{
				k1=1.0*(y2-y1)/(x2-x1);
				k2=1.0*(y4-y3)/(x4-x3);
				b1=y1-k1*x1;
				b2=y3-k2*x3;
				if(k1==k2&&b1!=b2){
					printf("No\n");
				}
				else{
					printf("Yes\n");
				}
			}
		}
	}
	return 0;
} 

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