hdu 1147

来源：互联网发布：killer lady动作数据编辑：程序博客网时间：2024/04/29 16:26
#include<stdio.h>int a[100010];struct node{double x,y;}start[100010],end[100010];double direction(struct node p1,struct node p2,struct node p){return (p1.x-p.x)*(p2.y-p.y)-(p1.y-p.y)*(p2.x-p.x);}bool is_on_segment(struct node p1,struct node p2,struct node p){double min,max;if(p1.x<p2.x){max=p2.x;min=p1.x;}else{max=p1.x;min=p2.x;}if(p.x<=max&&p.x>=min)return true;elsereturn false;}bool interesect_segment(struct node p1,struct node p2,struct node p3,struct node p4){double d1=direction(p1,p2,p3);double d2=direction(p1,p2,p4);double d3=direction(p3,p4,p1);double d4=direction(p3,p4,p2);if(d1*d2<0&&d3*d4<0)return true;if(d1==0&&is_on_segment(p1,p2,p3)==true)return true;if(d2==0&&is_on_segment(p1,p2,p4)==true)return true;if(d3==0&&is_on_segment(p3,p4,p1)==true)return true;if(d4==0&&is_on_segment(p3,p4,p2)==true)return true; return false;}int main(){int n,i,j,k;while(scanf("%d",&n)!=EOF){if(n==0)break;for(i=0;i<n;i++)scanf("%lf%lf%lf%lf",&start[i].x,&start[i].y,&end[i].x,&end[i].y);k=0;for(i=0;i<n;i++){for(j=i+1;j<n;j++){if(interesect_segment(start[i],end[i],start[j],end[j])==true)              break;}if(j==n)a[k++]=i+1;}printf("Top sticks: ");for(i=0;i<k;i++){if(i==k-1)printf("%d.\n",a[i]);else   printf("%d, ",a[i]);}}return 0;}#include<stdio.h>int a[100010];#define EPS 1e-9struct node{double x,y;}start[100010],end[100010];double direction(struct node p1,struct node p2,struct node p){return (p1.x-p.x)*(p2.y-p.y)-(p1.y-p.y)*(p2.x-p.x);}bool interesect_segment(struct node p1,struct node p2,struct node p3,struct node p4){double d1=direction(p1,p2,p3);double d2=direction(p1,p2,p4);double d3=direction(p3,p4,p1);double d4=direction(p3,p4,p2);if(d1*d2<=EPS&&d3*d4<=EPS)return true; return false;}int main(){int n,i,j,k;while(scanf("%d",&n)!=EOF){if(n==0)break;for(i=0;i<n;i++)scanf("%lf%lf%lf%lf",&start[i].x,&start[i].y,&end[i].x,&end[i].y);k=0;for(i=0;i<n;i++){for(j=i+1;j<n;j++){if(interesect_segment(start[i],end[i],start[j],end[j])==true)              break;}if(j==n)a[k++]=i+1;}printf("Top sticks: ");for(i=0;i<k;i++){if(i==k-1)printf("%d.\n",a[i]);else   printf("%d, ",a[i]);}}return 0;}
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