#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#define pi 3.14159
typedef struct v1
{
int x, y;
}vertex;
vertex p0;
int process_vertices( int n, vertex *v)
{
int i;
for(i=0;i<n;i++) scanf(" %d %d",&v[i].x,&v[i].y);
return n;
}
void swap(vertex *v1, vertex *v2)
{
vertex temp = *v1;
*v1 = *v2;
*v2 = temp;
}
int orientation(vertex p, vertex q, vertex r)
{
int val = (int)(q.y - p.y) * (r.x - q.x) - ( int)(q.x - p.x) * (r.y
- q.y);
if (val == 0) return 0;
return (val > 0)? 1: 2;
}
int distSq(vertex p1, vertex p2)
{
return (int)(p1.x - p2.x)*(p1.x - p2.x) + ( int)(p1.y - p2.y)*(p1.y
- p2.y);
}
int compare(const void *vp1, const void *vp2)
{
vertex *p1 = (vertex *)vp1;
vertex *p2 = (vertex *)vp2;
int o = orientation(p0, *p1, *p2);
if (o == 0)
return (distSq(p0, *p2) >= distSq(p0, *p1))? -1 : 1;
return (o == 2)? -1: 1;
}
vertex * Convex_Hull(vertex *v, int *count)
{
int n = *count, ymin = v[0].y, min = 0, i,m;vertex *stack;
for(i = 1; i < n; i++)
{
if((v[i].y < ymin) || ((v[i].y == ymin) && (v[i].x <
v[min].x)))
{
ymin = v[i].y;
min = i;
}
}
swap(&v[0], &v[min]);
p0 = v[0];
if(n > 1)
qsort(&v[1], n - 1, sizeof(vertex), compare);
m = 1;
for(i = 1; i < n; i++)
{
while((i < n - 1) && orientation(v[0], v[i], v[i + 1])
== 0)
i++;
v[m++] = v[i];
}
*count = n = m;
if(n < 3)
return v;
stack = (vertex *)malloc(n * sizeof(vertex));
stack[0] = v[0];
stack[1] = v[1];
stack[2] = v[2];
m = 2;
for(i = 3; i < n; i++)
{
while(orientation(stack[m-1], stack[m], v[i]) != 2)
m--;
stack[++m] = v[i];
}
*count = n = ++m;
free(v);
return stack;
}
int main()
{
int t, n, i,count;
vertex *v;
scanf("%d", &n);
v = (vertex *)malloc( n * sizeof(vertex));
count = process_vertices(n, v);
v = Convex_Hull(v, &count);
for(i=0;i<count;i++)
printf("%d %d\n",v[i].x,v[i].y);
return 0;
}
/* run this code in online c compiler.*/
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