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Cod sursa(job #930423)
#include<fstream>
#include<cmath>
using namespace std;
ifstream f("adapost2.in");
ofstream g("adapost2.out");
const int dx[]={0,1,0,-1},dy[]={1,0,-1,0};
int n,nr=38;
double x[50010],y[50010],px,py,dmin=1000000000,t,pas=512;
int main()
{
f>>n;
for(int i=1;i<=n;++i){f>>x[i]>>y[i]; px+=x[i]; py+=y[i];}
px/=n; py/=n;
int nr;
if(n<10000) nr=50;
for(int i=1;i<=nr;pas/=2,++i)
for(int j=0;j<4;++j)
{
t=0;
for(int i=1;i<=n;++i) t+=sqrt((px+pas*dx[j]-x[i])*(px+pas*dx[j]-x[i])+(py+pas*dy[j]-y[i])*(py+pas*dy[j]-y[i]));
if(t<dmin)
{
dmin=t;
px+=pas*dx[j];
py+=pas*dy[j];
pas*=2;
break;
}
}
g<<px<<" "<<py<<"\n";
return 0;
}