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| #include "stdafx.h"
#include <stdlib.h>
#include<iostream>
#include <conio.h>
#include <stdio.h>
#include <cstdio>
#include <string.h>
#include <algorithm>
#include <vector>
#include <math.h>
struct point {
int x, y;
point() {}
point(int a, int b) : x(a), y(b) {}
point operator - (point a) {
return point(x - a.x, y - a.y);
}
};
point p0, p1, p2;
point p[200];
template <class T >;
void leftpoint(vector <T> &ob) {// саму нижню
int min_ = 0;
for (int j = 0; j< 12;j++) {
if (p[j].x < p[min_].x)
min_ = j;
else
if (p[j].x == p[min_].x) //
if (p[j].y < p[min_].y)
min_ = j;
}
p0 = p[min_];
sort(p, p + 4, l); // відносно кута і першої
for (int i = 0; i < 12; i++) {
while (ob.size() >= 2 && vp(ob[ob.size() - 1] - ob[ob.size() - 2], p[i] - ob[ob.size() - 1]) <= 0)
ob.pop_back();
ob.push_back(p[i]);
}
if (ob.size() == 12)
return 1;
}
// Ориентированная площадь
int vp(point a, point b) {
return a.x*b.y - a.y*b.x;
}
// Расстояние между точками
int dist(point p1, point p2) {
return (p2 - p1).x * (p2 - p1).x + (p2 - p1).y*(p2 - p1).y;
}
// порівння сортування
bool l(point p1, point p2) {
return vp(p1 - p0, p2 - p0) > 0 || (vp(p1 - p0, p2 - p0) == 0 && dist(p0, p2) < dist(p0, p1));
}
// Точки
using namespace std;
int main() {
//freopen("convex.in", "r", stdin);
// freopen("convex.out", "w", stdout);
int i, min_ind = 0;
for (i = 0; i < n; i++)
cin >> p[i].x >> p[i].y;
vector <point> T;
if (leftpoint(T) == 1) {
cout << "12"<< endl; // кколво точок
//cout << endl;
cout << p[i].x << " " << p[i].y << endl;
// вивів точку
//знаходимо всі діагоналі , потім сортуємо їх
int rex = 0, rey = 6;
int k1, w1, k2, w2;
double a[6], b[6];
for (int i = 0;i < 6;i++) {
k1 = p[rex].x;
w1 = p[rex].y;
k2 = p[rey].x;
w2 = p[rey].y;
a[i] = sqrt(((k1 - k2)*(k1 - k2) + (w1 - w2)*(w1 - w2)));
b[i] = a[i];
rex++;
rey++;
}
sort(a, a + 6);
int d1, d2;
for (int i = 0;i < 6;i++)
{
if (a[0] == b[i])
d1 = i;
else
if (a[1] == b[i] && a[5] != a[4])
d2 = i;
}
int res1x, res1y, resx2, resy2;
switch (d1) {
case 0:
res1x = p[0].x;
res1y = p[0].y;
resx2 = p[6].x;
resy2 = p[6].y;
break;
case 1:
res1x = p[1].x;
res1y = p[1].y;
resx2 = p[7].x;
resy2 = p[7].y;
break;
case 2:
res1x = p[2].x;
res1y = p[2].y;
resx2 = p[8].x;
resy2 = p[8].y;
break;
case 3:
res1x = p[3].x;
res1y = p[3].y;
resx2 = p[9].x;
resy2 = p[9].y;
break;
case 4:
res1x = p[4].x;
res1y = p[4].y;
resx2 = p[10].x;
resy2 = p[10].y;
break;
case 5:
res1x = p[5].x;
res1y = p[5].y;
resx2 = p[11].x;
resy2 = p[11].y;
break;
}
int ress1x, ress1y, ressx2, ressy2;
switch (d2) {
case 0:
ress1x = p[0].x;
ress1y = p[0].y;
ressx2 = p[6].x;
ressy2 = p[6].y;
break;
case 1:
ress1x = p[1].x;
ress1y = p[1].y;
ressx2 = p[7].x;
ressy2 = p[7].y;
break;
case 2:
ress1x = p[2].x;
ress1y = p[2].y;
ressx2 = p[8].x;
ressy2 = p[8].y;
break;
case 3:
ress1x = p[3].x;
ress1y = p[3].y;
ressx2 = p[9].x;
ressy2 = p[9].y;
break;
case 4:
ress1x = p[4].x;
ress1y = p[4].y;
ressx2 = p[10].x;
ressy2 = p[10].y;
break;
case 5:
ress1x = p[5].x;
ress1y = p[5].y;
ressx2 = p[11].x;
ressy2 = p[11].y;
break;
}
cout << res1x << " " << res1y << " " << resx2 << " " << resy2 << endl;
cout << ress1x << " " << ress1y << " " << ressx2 << " " << ressy2 << endl;
}
else {
cout << "ERROR";
_getch();
return 0;
}
_getch();
return 0;
} |
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