Cod sursa(job #301466)

Utilizator alexysPop Carla alexys Data 8 aprilie 2009 11:23:28
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include<iostream>
#include<fstream>
using namespace std;
char p[2000010];;
int nr=0,i,j,n;
ifstream f("ciur.in");
ofstream g("ciur.out");

int main()
{f>>n;

p[1]=0;

for(i=2; i<=n; i++)
p[i]=1;

for(i=2; i<=n; i++)
if(p[i])
for(j=i+i; j<=n; j=j+i)
p[j]=0;

for(i=1; i<=n; i++)
if(p[i]) nr++;
g<<nr;
//system("pause");
return 0;}