#include<stdio.h> int main() { float x1,x2,x3,x4,y1,y2,y3,y4; while(scanf("%f%f%f%f%f%f%f%f",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4)!=EOF) { if(x1==x2||x3==x4)//斜率无穷 { if(x1==x2&&x3==x4) { if(x1==x2)//重合 printf("Yes\n"); else//不重合平行 printf("No\n"); } else printf("Yes\n"); } else { float k1,k2,b1,b2; k1=(y2-y1)/(x2-x1); k2=(y4-y3)/(x4-x3); b1=y1-k1*x1; b2=y3-k2*x3; if(k1==k2&&b1!=b2)//斜率相等不重合 printf("No\n"); else if(k1==k2&&b1==b2)//斜率相等且重合 printf("Yes\n"); else//斜率不等 printf("Yes\n"); } } return 0; } |
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