#include<stdio.h>
#include<algorithm>
#include<string.h>
#include<vector>
#include<math.h>
#include<stdlib.h>
using namespace std;
struct point{
point(){}
point(int x,int y):x(x),y(y){}
int x,y;
bool operator<(const point &l)const{return x!=l.x?x<l.x:y<l.y;}
}p[920];
int N;
int ord[920];
bool check[920];
int o[920];
int u;
bool comp(const int &a,const int &b)
{
return p[a]<p[b];
}
bool comp2(const int &a,const int &b)
{
return atan2(p[a].y-p[u].y,p[a].x-p[u].x)<atan2(p[b].y-p[u].y,p[a].x-p[u].x);
}
void solve(int x)
{
int i,p1=0,p2=0;
check[x]=1;
u=x;
sort(ord+1,ord+1+3*N,comp2);
for(i=1;i<=3*N;i++){
if(check[ord[i]])continue;
if(p1==0)p1=ord[i];
else if(p2==0){p2=ord[i];break;}
}
check[p1]=check[p2]=1;
printf("%d %d %d\n",x,p1,p2);
}
int main()
{
int i;
scanf("%d",&N);
for(i=1;i<=3*N;i++){
scanf("%d%d",&p[i].x,&p[i].y);
}
for(i=1;i<=3*N;i++){o[i]=i;ord[i]=i;}
sort(o+1,o+1+3*N,comp);
for(i=1;i<=3*N;i++){
if(check[o[i]])continue;
solve(o[i]);
}
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
4 ms |
1328 KB |
SIGSEGV Segmentation fault |
| 2 |
Halted |
0 ms |
0 KB |
- |
