Cod sursa(job #664055)
| Utilizator |  Costea Loredana loredanacostea |
Data | 19 ianuarie 2012 15:37:03 |
|---|---|---|---|
| Problema | Ciurul lui Eratosthenes | Scor | 0 |
| Compilator | cpp | Status | done |
| Runda | Arhiva educationala | Marime | 0.26 kb |
#include<fstream>
using namespace std;
int i,j,n,nr;
char a[200000001];
int main()
{
ifstream f("ciur.in");
ofstream g("ciur.out");
f>>n;
for(i=2;i<=n;i++)
{
if(a[i]==0)
{
nr++;
for(j=i+i;j<=n;j+=i)
a[i]=1;
}}
g<<nr;
return 0;
}