Cod sursa(job #301509)

Utilizator alexysPop Carla alexys Data 8 aprilie 2009 11:40:56
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.36 kb
Raporteaza aceasta sursa 
#include<iostream>
#include<fstream>
using namespace std;
char p[2000010];
int contor=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])
contor++;
g<<contor;

return 0;

    
    
    }