Cod sursa(job #538213)

Utilizator marS003Nastase Liviu marS003 Data 20 februarie 2011 21:38:05
Problema Ciurul lui Eratosthenes Scor 20
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.31 kb
Raporteaza aceasta sursa 
#include<iostream.h>
#include<fstream.h>
int main()
{char x[20000];
int n,i,j,nr=0;
ifstream f("ciur.in");
f>>n;
f.close();
for(i=2;i<=n;i++)
 x[i]=1;
for(i=2;i<=n;i++)
 if(x[i]==1) {nr++;
	      for(j=i+i;j<=n;j=j+i)
	      x[j]=0;
	      }
ofstream g("ciur.out");
g<<nr;
g.close();
return 0;
}