Cod sursa(job #1046498)

Utilizator buzu.tudor67Tudor Buzu buzu.tudor67 Data 2 decembrie 2013 23:07:55
Problema Adapost 2 Scor 90
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.16 kb
#include<fstream>
#include<iomanip>
#include<cmath>
#define maxn 50005
#define eps 0.0001
using namespace std;
ifstream fi("adapost2.in");
ofstream fo("adapost2.out");

double x[maxn],y[maxn],salt;
double px=0.0,py=0.0,q=0.0;
int i,n;

inline double dist(double a,double b){
       double d=0.0;
       
       for(int i=1;i<=n;i++)
          d+=sqrt((x[i]-a)*(x[i]-a)+(y[i]-b)*(y[i]-b));
          
       return d;
}

int main(){
    fi>>n;
    
    for(i=1;i<=n;i++) {
                       fi>>x[i]>>y[i];
                       px+=x[i];
                       py+=y[i];
                      }
                      
    px/=n; py/=n; q=dist(px,py); salt=100;
    bool t;
    while(salt>eps)
     {
      t=false;
      if (dist(px,py+salt)<q) { py+=salt; q=dist(px,py); t=true; };
      if (dist(px,py-salt)<q) { py-=salt; q=dist(px,py); t=true; };
      if (dist(px+salt,py)<q) { px+=salt; q=dist(px,py); t=true; };
      if (dist(px-salt,py)<q) { px-=salt; q=dist(px,py); t=true; };
      salt/=2;
      if(t)salt*=2;
     }
    
    fo<<fixed<<setprecision(4)<<px<<" "<<py;
    
    fi.close();
    fo.close();
    return 0;
}