제출 #3833

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
3833		hyeonjae0310	Divide into triangle (kriii1_D)	C++98	0 / 1	0 ms	1240 KiB

D

#include <stdio.h>
#include <algorithm>
#include <vector>

using namespace std;

typedef struct POINT
{
	pair<int, int> point;
	int index;
}POINT;

POINT STD;

int CCW(pair<int, int> a, pair<int, int> b, pair<int, int> c)
{
	return (a.first*b.second+b.first*c.second+c.first+a.second)-(a.second*b.first+b.second*c.first+c.second*a.first);
}

bool pair_compare(POINT a, POINT b)
{
	if(a.point.first != b.point.first)
	{
		return (a.point.first < b.point.first);
	}
	else
	{
		return (a.point.second < b.point.second);
	}
}

bool angle_compare(POINT a, POINT b)
{
	return (CCW(STD.point, a.point, b.point) < 0);
}

int main()
{
	vector<POINT> pt;
	int N;
	scanf("%d", &N);
	pt.resize(3*N);
	for(int i = 0 ; i < 3*N ; i++)
	{
		scanf("%d %d", &pt[i].point.first, &pt[i].point.second);
		pt[i].index = i+1;
	}
	while(!pt.empty())
	{
		sort(pt.begin(), pt.end(), pair_compare);
		STD = pt[0];
		sort(pt.begin()+1, pt.end(), angle_compare);
		for(int i = 0 ; i < 3 ; i++)
		{
			printf("%d ", pt.front().index);
			pt.erase(pt.begin());
		}
		printf("\n");
	}
	return 0;
}

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