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