View Code of Problem 67

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

	
	} 
	return 0;
}