mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
#include<cstdio>
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#include<cstring>
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#include<iostream>
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#include<cmath>
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#define eps 1e-6
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#define pi acos(-1)
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using namespace std;
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struct node
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{
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double x,y;
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};
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node p[4];
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double getdis(node p1,node p2)
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{
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return sqrt((p1.x-p2.x)*(p1.x-p2.x)+(p1.y-p2.y)*(p1.y-p2.y));
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}
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double getang(double a,double b,double c)
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{
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double ang= (a*a+b*b-c*c)/(2*a*b);
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return acos(ang);
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}
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int main()
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{
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char str[1000];
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while(gets(str)&&strcmp(str,"END")!=0)
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{
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sscanf(str,"%lf%lf",&p[0].x,&p[0].y);
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scanf("%lf%lf%lf%lf",&p[1].x,&p[1].y,&p[2].x,&p[2].y);
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getchar();
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double dis1=getdis(p[0],p[1]);
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double dis2=getdis(p[1],p[2]);
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double dis3=getdis(p[0],p[2]);
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double ang1=getang(dis1,dis2,dis3);
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double ang2=getang(dis2,dis3,dis1);
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double ang3=getang(dis1,dis3,dis2);
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for(int i=3; i<=1000; i++)
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{
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if(ang1*i/pi-(int)(ang1*i/pi+eps)<eps && ang2*i/pi-(int)(ang2*i/pi+eps)<eps && ang3*i/pi-(int)(ang3*i/pi+eps)<eps)
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{
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printf("%d\n",i);
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break;
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}
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}
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}
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return 0;
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}
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