Cod sursa(job #679518)
| Utilizator |  Andreica Eric ericqw |
Data | 13 februarie 2012 13:27:02 |
|---|---|---|---|
| Problema | Ciurul lui Eratosthenes | Scor | 100 |
| Compilator | cpp | Status | done |
| Runda | Arhiva educationala | Marime | 0.27 kb |
#include<fstream>
using namespace std;
long long i,n,j,c;
bool v[2000002];
int main()
{
ifstream f("ciur.in");
ofstream g("ciur.out");
f>>n;
for (i=2;i<=n;i++)
v[i]=1;
for (i=2;i<=n;i++)
if (v[i]==1)
{c++;
for(j=i+i;j<=n;j=j+i)
v[j]=0;
}
g<<c;
return 0;
}