Cod sursa(job #69567)

Utilizator gabitzish1Gabriel Bitis gabitzish1 Data 3 iulie 2007 16:04:43
Problema Sum Scor 75
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.76 kb
#include<stdio.h>
#include<fstream.h>
#include<math.h>

typedef struct
{
  long x, e;
}  factor;

long v[80001], u[80001];

long n, contor, nr, x;

void eratostene()
{
  long long i,j;
  for(i=2;i<=80000;i++) v[i]=i;

  for(i=2;i<=80000;i++)
   {
    if(i>80000) break;
    if(u[i]==0)
     {
      j=2;
      v[i]--;
      while(i*j<=80000)
	{
	  u[i*j]=1;
	  v[i*j]=v[i*j]-v[i*j]/i;
	  j++;
	}
    
       }
    }
}



void prelucrare2()
{
   long long unsigned i, j, s1;
   ifstream in("sum.in");
   ofstream out("sum.out");
   in>>n;
   eratostene(); 
   for (i=1; i<=n; i++)
     {
       in>>x;
	s1=(v[x]*x)/2;

      s1*=2;
      out<<s1*2<<'\n';
     }
}




int main()
{
  prelucrare2();
  return 0;
}