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